# All files / csv2json/dist csvtojson.js

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     (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
    if (window){
      window.csvtojson=require("./index.js");
      window.csvtojson.version=require("./package.json").version;
    }

    },{"./index.js":2,"./package.json":134}],2:[function(require,module,exports){
    module.exports = require("./libs/csv2json.js");
    },{"./libs/csv2json.js":24}],3:[function(require,module,exports){
    var util = require("util");
    module.exports = CSVError;
    function CSVError(err, index, extra) {
      Error.call(this, "");
      this.err = err;
      this.line = index;
      this.extra = extra;
      this.message = "Error: " + err + ". JSON Line number: " + index + (extra ? " near: " + extra : "");
      this.name = "CSV Error";
    }
    util.inherits(CSVError, Error);

    CSVError.prototype.toString = function() {
      return JSON.stringify([this.err, this.line, this.extra]);
    };

    CSVError.column_mismatched = function(index, extra) {
      return new CSVError("column_mismatched", index, extra);
    };

    CSVError.unclosed_quote = function(index, extra) {
      return new CSVError("unclosed_quote", index, extra);
    };

    CSVError.fromArray = function(arr) {
      return new CSVError(arr[0], arr[1], arr[2]);
    };

    },{"util":73}],4:[function(require,module,exports){
    (function (process,Buffer){
    var util = require("util");
    var Transform = require("stream").Transform;
    var os = require("os");
    var stripBom = require('strip-bom');
    var eol = os.EOL;
    // var Processor = require("./Processor.js");
    var defParam = require("./defParam");
    var fileline = require("./fileline");
    var fileLineToCSVLine = require("./fileLineToCSVLine");
    var linesToJson = require("./linesToJson");
    var CSVError = require("./CSVError");
    var workerMgr = null;
    var _ = require('lodash');
    var rowSplit = require("./rowSplit");
    function Converter(params, options) {
      Transform.call(this, options);
      this._options = options || {};
      this.param = defParam(params);
      this.param._options = this._options;
      // this.resultObject = new Result(this);
      // this.pipe(this.resultObject); // it is important to have downstream for a transform otherwise it will stuck
      this.started = false;//indicate if parsing has started.
      this.recordNum = 0;
      this.lineNumber = 0; //file line number
      this._csvLineBuffer = "";
      this.lastIndex = 0; // index in result json array
      //this._pipe(this.lineParser).pipe(this.processor);
      // this.initNoFork();
      if (this.param.forked) {
        this.param.forked = false;
        this.workerNum = 2;
      }
      this.flushCb = null;
      this.processEnd = false;
      this.sequenceBuffer = [];
      this._needJson = null;
      this._needEmitResult = null;
      this._needEmitFinalResult = null;
      this._needEmitJson = null;
      this._needPush = null;
      this._needEmitCsv = null;
      this._csvTransf = null;
      this.finalResult = [];
      // this.on("data", function() {});
      this.on("error", emitDone(this));
      this.on("end", emitDone(this));
      this.initWorker();
      process.nextTick(function () {
        if (this._needEmitFinalResult === null) {
          this._needEmitFinalResult = this.listeners("end_parsed").length > 0;
        }
        if (this._needEmitResult === null) {
          this._needEmitResult = this.listeners("record_parsed").length > 0;
        }
        if (this._needEmitJson === null) {
          this._needEmitJson = this.listeners("json").length > 0;
        }
        if (this._needEmitCsv === null) {
          this._needEmitCsv = this.listeners("csv").length > 0;
        }
        if (this._needJson === null) {
          this._needJson = this._needEmitJson || this._needEmitFinalResult || this._needEmitResult || this.transform || this._options.objectMode;
        }
        if (this._needPush === null) {
          this._needPush = this.listeners("data").length > 0 || this.listeners("readable").length > 0;
          // this._needPush=false;
        }
        this.param._needParseJson = this._needJson || this._needPush;
      }.bind(this));

      return this;
    }

    util.inherits(Converter, Transform);
    function emitDone(conv) {
      return function (err) {
        if (!conv._hasDone) {
          conv._hasDone = true;
          process.nextTick(function () {
            conv.emit('done', err);
          });
        };
      }
    }
    var useBufferFrom=process.versions.node.split(".")[0]>=6;
    function bufFromString(str){
      return useBufferFrom?Buffer.from(str,"utf8"):new Buffer(str,"utf8");
    }
    Converter.prototype._transform = function (data, encoding, cb) {
      data=this.prepareData(data);
      var idx =data.length-1;
      var left=null;
      if ((data[idx] & 1<<7) !=0){
        while ((data[idx] & 3<<6) === 128){
          idx--;
        }
        idx--;
      }
      if (idx !=data.length-1){
        left=data.slice(idx+1);
        data=data.slice(0,idx+1)
        var _cb=cb;
        var self=this;
        cb=function(){
          if (self._csvLineBuffer){
            self._csvLineBuffer=Buffer.concat([bufFromString(self._csvLineBuffer,"utf8"),left]);
          }else{
            self._csvLineBuffer=left;
          }
          _cb();
        }
      }
      data = data.toString("utf8");
      if (this.started === false) {
        this.started = true;
        data = stripBom(data);
        if (this.param.toArrayString) {
          if (this._needPush) {
            this.push("[" + eol, "utf8");
          }
        }
      }
      var self = this;
      this.preProcessRaw(data, function (d) {
        if (d && d.length > 0) {
          self.processData(d, cb);
        } else {
          cb();
        }
      });
    };

    Converter.prototype.prepareData = function (data) {
      if (this._csvLineBuffer && this._csvLineBuffer.length>0){
        if (typeof this._csvLineBuffer === "string"){
          this._csvLineBuffer=bufFromString(this._csvLineBuffer);
        }
        return Buffer.concat([this._csvLineBuffer,data]);
      }else{
        return data;
      }
      // return this._csvLineBuffer + data;
    };

    Converter.prototype.setPartialData = function (d) {
      this._csvLineBuffer = d;
    };

    Converter.prototype.processData = function (data, cb) {
      var params = this.param;
      if (params.ignoreEmpty && !params._headers) {
        data = data.trimLeft();
      }
      var fileLines = fileline(data, this.param);
      if (fileLines.lines.length > 0) {
        if (this.preProcessLine && typeof this.preProcessLine === "function") {
          fileLines.lines = this._preProcessLines(fileLines.lines, this.lastIndex);
        }
        if (!params._headers) { //header is not inited. init header
          this.processHead(fileLines, cb);
        } else {
          if (params.workerNum <= 1) {
            var lines = fileLineToCSVLine(fileLines, params);
            this.setPartialData(lines.partial);
            var jsonArr = linesToJson(lines.lines, params, this.recordNum);
            this.processResult(jsonArr);
            this.lastIndex += jsonArr.length;
            this.recordNum += jsonArr.length;
            cb();
          } else {
            this.workerProcess(fileLines, cb);
          }
        }
      } else {
        this.setPartialData(fileLines.partial);
        cb();
      }
    };

    Converter.prototype._preProcessLines = function (lines, startIdx) {
      var rtn = [];
      for (var i = 0, len = lines.length; i < len; i++) {
        var result = this.preProcessLine(lines[i], startIdx + i + 1);
        if (typeof result === "string") {
          rtn.push(result);
        } else {
          rtn.push(lines[i]);
          this.emit("error", new Error("preProcessLine should return a string but got: " + JSON.stringify(result)));
        }
      }
      return rtn;
    };

    Converter.prototype.initWorker = function () {
      var workerNum = this.param.workerNum - 1;
      if (workerNum > 0) {
        workerMgr = require("./workerMgr");
        this.workerMgr = workerMgr();
        this.workerMgr.initWorker(workerNum, this.param);
      }
    };

    Converter.prototype.preRawData = function (func) {
      this.preProcessRaw = func;
      return this;
    };

    Converter.prototype.preFileLine = function (func) {
      this.preProcessLine = func;
      return this;
    };

    /**
     * workerpRocess does not support embeded multiple lines.
     */
    Converter.prototype.workerProcess = function (fileLine, cb) {
      var self = this;
      var line = fileLine;
      var eol = this.getEol();
      this.setPartialData(line.partial);
      this.workerMgr.sendWorker(line.lines.join(eol) + eol, this.lastIndex, cb, function (results, lastIndex) {
        var buf;
        var cur = self.sequenceBuffer[0];
        if (cur.idx === lastIndex) {
          cur.result = results;
          var records = [];
          while (self.sequenceBuffer[0] && self.sequenceBuffer[0].result) {
            buf = self.sequenceBuffer.shift();
            records = records.concat(buf.result);
          }
          self.processResult(records);
          self.recordNum += records.length;
        } else {
          for (var i = 0, len = self.sequenceBuffer.length; i < len; i++) {
            buf = self.sequenceBuffer[i];
            if (buf.idx === lastIndex) {
              buf.result = results;
              break;
            }
          }
        }
      });
      this.sequenceBuffer.push({
        idx: this.lastIndex,
        result: null
      });
      this.lastIndex += line.lines.length;
    };

    Converter.prototype.processHead = function (fileLine, cb) {
      var params = this.param;
      if (params._headers) {
        return cb();
      }
      //dirty hack
      params._needFilterRow = false;
      // if header is not inited. init header
      var lines = fileLine.lines;
      var left = "";
      var headerRow = [];
      if (!params.noheader) {
        while (lines.length) {
          var line = left + lines.shift();
          var row = rowSplit(line, params);
          if (row.closed) {
            headerRow = row.cols;
            left = "";
            break;
          } else {
            left = line + this.getEol();
          }
        }
      }
      params._needFilterRow = true;
      if (!params.noheader && headerRow.length === 0) { //if one chunk of data does not complete header row.
        this.setPartialData(left);
        return cb();
      }
      if (params.noheader) {
        if (params.headers) {
          params._headers = params.headers;
        } else {
          params._headers = [];
        }
      } else {
        if (params.headers) {
          params._headers = params.headers;
        } else {
          params._headers = headerRow;
        }
      }
      configIgnoreIncludeColumns(params);
      params._headers = require("./filterRow")(params._headers, params);
      var lines = fileLineToCSVLine(fileLine, params);
      this.setPartialData(lines.partial);
      if (this.param.workerNum > 1) {
        this.workerMgr.setParams(params);
      }
      var res = linesToJson(lines.lines, params, 0);
      this.processResult(res);
      this.lastIndex += res.length;
      this.recordNum += res.length;

      cb();
    };
    function configIgnoreIncludeColumns(params) {
      if (params._postIgnoreColumns) {
        for (var i = 0; i < params.ignoreColumns.length; i++) {
          var ignoreCol = params.ignoreColumns[i];
          if (typeof ignoreCol === "string") {
            var idx = params._headers.indexOf(ignoreCol);
            if (idx > -1) {
              params.ignoreColumns[i] = idx;
            } else {
              params.ignoreColumns[i] = -1;
            }
          }
        }
        params.ignoreColumns.sort(function (a, b) { return b - a; });
      }
      if (params._postIncludeColumns) {
        for (var i = 0; i < params.includeColumns.length; i++) {
          var includeCol = params.includeColumns[i];
          if (typeof includeCol === "string") {
            var idx = params._headers.indexOf(includeCol);
            if (idx > -1) {
              params.includeColumns[i] = idx;
            } else {
              params.includeColumns[i] = -1;
            }
          }
        }
      }
      params.ignoreColumns = _.uniq(params.ignoreColumns);
      params.includeColumns = _.uniq(params.includeColumns);
    }

    Converter.prototype.processResult = function (result) {
      for (var i = 0, len = result.length; i < len; i++) {
        var r = result[i];
        if (r.err) {
          this.emit("error", r.err);
        } else {
          this.emitResult(r);
        }
      }
    };

    Converter.prototype.emitResult = function (r) {
      var index = r.index;
      var row = r.row;
      var result = r.json;
      var resultJson = null;
      var resultStr = null;
      if (typeof result === "string") {
        resultStr = result;
      } else {
        resultJson = result;
      }
      if (resultJson === null && this._needJson) {
        resultJson = JSON.parse(resultStr);
        if (typeof row === "string") {
          row = JSON.parse(row);
        }
      }
      if (this.transform && typeof this.transform === "function") {
        this.transform(resultJson, row, index);
        resultStr = null;
      }
      if (this._needEmitJson) {
        this.emit("json", resultJson, index);
      }
      if (this._needEmitCsv) {
        if (typeof row === "string") {
          row = JSON.parse(row);
        }
        this.emit("csv", row, index);
      }
      if (this.param.constructResult && this._needEmitFinalResult) {
        this.finalResult.push(resultJson);
      }
      if (this._needEmitResult) {
        this.emit("record_parsed", resultJson, row, index);
      }
      if (this.param.toArrayString && index > 0 && this._needPush) {
        this.push("," + eol);
      }
      if (this._options && this._options.objectMode) {
        this.push(resultJson);
      } else {
        if (this._needPush) {
          if (resultStr === null) {
            resultStr = JSON.stringify(resultJson);
          }
          this.push(!this.param.toArrayString ? resultStr + eol : resultStr, "utf8");
        }
      }
    };

    Converter.prototype.preProcessRaw = function (data, cb) {
      cb(data);
    };

    // FIXME: lineNumber is not used.
    Converter.prototype.preProcessLine = function (line, lineNumber) {
      return line;
    };

    Converter.prototype._flush = function (cb) {
      var self = this;
      this.flushCb = function () {
        self.emit("end_parsed", self.finalResult);
        if (self.workerMgr) {
          self.workerMgr.destroyWorker();
        }
        cb();
        if (!self._needPush) {
          self.emit("end");
        }
      };
      if (this._csvLineBuffer.length > 0) {
        var eol = this.getEol();
        if (this._csvLineBuffer[this._csvLineBuffer.length - 1] !== eol) {
          this._csvLineBuffer += eol;
        }
        this.processData(this._csvLineBuffer, function () {
          this.checkAndFlush();
        }.bind(this));
      } else {
        this.checkAndFlush();
      }
      return;
    };

    Converter.prototype.checkAndFlush = function () {
      if (this._csvLineBuffer.length !== 0) {
        this.emit("error", CSVError.unclosed_quote(this.recordNum, this._csvLineBuffer), this._csvLineBuffer);
      }
      if (this.param.toArrayString && this._needPush) {
        this.push(eol + "]", "utf8");
      }
      if (this.workerMgr && this.workerMgr.isRunning()) {
        this.workerMgr.drain = function () {
          this.flushCb();
        }.bind(this);
      } else {
        this.flushCb();
      }
    };

    Converter.prototype.getEol = function (data) {
      if (!this.param.eol && data) {
        for (var i = 0, len = data.length; i < len; i++) {
          if (data[i] === "\r") {
            if (data[i + 1] === "\n") {
              this.param.eol = "\r\n";
            } else {
              this.param.eol = "\r";
            }
            return this.param.eol;
          } else if (data[i] === "\n") {
            this.param.eol = "\n";
            return this.param.eol;
          }
        }
        this.param.eol = eol;
      }

      return this.param.eol || eol;
    };

    Converter.prototype.fromFile = function (filePath, cb, options) {
      var fs = require('fs');
      var rs = null;
      if (typeof cb ==="object" && typeof options === "undefined"){
        options=cb;
        cb=null;
      }
      this.wrapCallback(cb, function () {
        if (rs && rs.destroy) {
          rs.destroy();
        }
      });
      fs.exists(filePath, function (exist) {
        if (exist) {
          rs = fs.createReadStream(filePath,options);
          rs.pipe(this);
        } else {
          this.emit('error', new Error("File not exists"));
        }
      }.bind(this));
      return this;
    };

    Converter.prototype.fromStream = function (readStream, cb) {
      if (cb && typeof cb === "function") {
        this.wrapCallback(cb);
      }
      readStream.pipe(this);
      return this;
    };

    Converter.prototype.transf = function (func) {
      this.transform = func;
      return this;
    };

    Converter.prototype.fromString = function (csvString, cb) {
      if (typeof csvString !== "string") {
        return cb(new Error("Passed CSV Data is not a string."));
      }
      if (cb && typeof cb === "function") {
        this.wrapCallback(cb, function () {
        });
      }
      process.nextTick(function () {
        this.end(csvString);
      }.bind(this));
      return this;
    };

    Converter.prototype.wrapCallback = function (cb, clean) {
      if (clean === undefined) {
        clean = function () { };
      }
      if (cb && typeof cb === "function") {
        this.once("end_parsed", function (res) {
          if (!this.hasError) {
            cb(null, res);
          }
        }.bind(this));
      }
      this.once("error", function (err) {
        this.hasError = true;
        if (cb && typeof cb === "function") {
          cb(err);
        }
        clean();
      }.bind(this));
    };

    module.exports = Converter;

    }).call(this,require('_process'),require("buffer").Buffer)
    },{"./CSVError":3,"./defParam":6,"./fileLineToCSVLine":13,"./fileline":14,"./filterRow":15,"./linesToJson":19,"./rowSplit":22,"./workerMgr":23,"_process":42,"buffer":33,"fs":31,"lodash":129,"os":41,"stream":60,"strip-bom":133,"util":73}],5:[function(require,module,exports){
    var getEol = require("./getEol");
    var rowSplit = require("./rowSplit");
    /**
     * Convert lines to csv columns
     * @param  {[type]} lines [file lines]
     * @param  {[type]} param [Converter param]
     * @return {[type]}  {lines:[[col1,col2,col3...]],partial:String}
     */
    module.exports = function(lines, param) {
      var csvLines = [];
      var left = "";
      while (lines.length) {
        var line = left + lines.shift();
        var row = rowSplit(line, param);
        if (row.closed) {
          csvLines.push(row.cols);
          left = "";
        } else {
          left = line + (getEol(line, param) || "\n"); // if unable to getEol from data, assume "\n"
        }
      }
      return {lines: csvLines, partial: left};
    };

    },{"./getEol":17,"./rowSplit":22}],6:[function(require,module,exports){
    (function (process){
    var numExp = /^[0-9]+$/;
    module.exports = function (params) {
      var _param = {
        constructResult: true, //set to false to not construct result in memory. suitable for big csv data
        delimiter: ',', // change the delimiter of csv columns. It is able to use an array to specify potencial delimiters. e.g. [",","|",";"]
        ignoreColumns: [], // columns to ignore upon input.
        includeColumns: [], // columns to include upon input.
        quote: '"', //quote for a column containing delimiter.
        trim: true, //trim column's space charcters
        checkType: false, //whether check column type
        toArrayString: false, //stream down stringified json array instead of string of json. (useful if downstream is file writer etc)
        ignoreEmpty: false, //Ignore empty value while parsing. if a value of the column is empty, it will be skipped parsing.
        workerNum: getEnv("CSV_WORKER", 1), //number of parallel workers. If multi-core CPU available, increase the number will get better performance for large csv data.
        fork: false, //use another CPU core to convert the csv stream
        noheader: false, //indicate if first line of CSV file is header or not.
        headers: null, //an array of header strings. If noheader is false and headers is array, csv header will be ignored.
        flatKeys: false, // Don't interpret dots and square brackets in header fields as nested object or array identifiers at all.
        maxRowLength: 0, //the max character a csv row could have. 0 means infinite. If max number exceeded, parser will emit "error" of "row_exceed". if a possibly corrupted csv data provided, give it a number like 65535 so the parser wont consume memory. default: 0
        checkColumn: false, //whether check column number of a row is the same as headers. If column number mismatched headers number, an error of "mismatched_column" will be emitted.. default: false
        escape: '"', //escape char for quoted column
        colParser:{}, //flags on columns to alter field processing.

        /**below are internal params */
        _columnConv:[],
        _headerType: [],
        _headerTitle: [],
        _headerFlag: [],
        _headers: null,
        _needFilterRow: false
      };
      if (!params) {
        params = {};
      }
      for (var key in params) {
        if (params.hasOwnProperty(key)) {
          _param[key] = params[key];
        }
      }
      if (_param.ignoreColumns.length > 0 && !numExp.test(_param.ignoreColumns.join(""))) {
        _param._postIgnoreColumns = true;
      }
      if (_param.includeColumns.length > 0 && !numExp.test(_param.includeColumns.join(""))) {
        _param._postIncludeColumns = true;
      }

      if (_param.ignoreColumns.length || _param.includeColumns.length) {
        _param._needFilterRow = true;
        if (!_param._postIgnoreColumns){
          _param.ignoreColumns.sort(function (a, b) { return b-a;});
        }
      }

      return _param;
    };

    function getEnv(key, def) {
      if (process.env[key]) {
        return process.env[key];
      } else {
        return def;
      }
    }

    }).call(this,require('_process'))
    },{"_process":42}],7:[function(require,module,exports){
    module.exports = [
      require('./parser_array.js'),
      require('./parser_json.js'),
      require('./parser_omit.js'),
      require('./parser_jsonarray.js'),
      require("./parser_flat.js")
    ];

    },{"./parser_array.js":8,"./parser_flat.js":9,"./parser_json.js":10,"./parser_jsonarray.js":11,"./parser_omit.js":12}],8:[function(require,module,exports){
    module.exports = {
      "name": "array",
      "processSafe":true,
      "regExp": /^\*array\*/,
      "parserFunc": function parser_array(params) {
        var fieldName = params.head.replace(this.regExp, '');
        if (params.resultRow[fieldName] === undefined) {
          params.resultRow[fieldName] = [];
        }
        params.resultRow[fieldName].push(params.item);
      }
    };

    },{}],9:[function(require,module,exports){
    module.exports = {
      "name": "flat",
      "processSafe": true,
      "regExp": /^\*flat\*/,
      "parserFunc": function parser_flat (params) {
         var key = this.getHeadStr();
         var val = params.item;
         params.resultRow[key] = val;
      }
    };

    },{}],10:[function(require,module,exports){
    var arrReg = /\[([0-9]*)\]/;

    function processHead(pointer, headArr, arrReg, flatKeys) {
      var headStr, match, index;
      while (headArr.length > 1) {
        headStr = headArr.shift();
        // match = headStr.match(arrReg);
        match = flatKeys ? false : headStr.match(arrReg);
        if (match) { //if its array, we need add an empty json object into specified index.
          if (pointer[headStr.replace(match[0], '')] === undefined) {
            pointer[headStr.replace(match[0], '')] = [];
          }
          index = match[1]; //get index where json object should stay
          pointer = pointer[headStr.replace(match[0], '')];
          if (index === '') { //if its dynamic array index, push to the end
            index = pointer.length;
          }
          if (!pointer[index]) { //current index in the array is empty. we need create a new json object.
            pointer[index] = {};
          }
          pointer = pointer[index];
        } else { //not array, just normal JSON object. we get the reference of it
          if (pointer[headStr] === undefined) {
            pointer[headStr] = {};
          }
          pointer = pointer[headStr];
        }
      }
      return pointer;
    }
    module.exports = {
      "name": "json",
      "processSafe": true,
      "regExp": /^\*json\*/,
      "parserFunc": function parser_json(params) {
        var fieldStr = this.getHeadStr();
        var headArr = (params.config && params.config.flatKeys) ? [fieldStr] : fieldStr.split('.');
        var match, index, key;
        //now the pointer is pointing the position to add a key/value pair.
        var pointer = processHead(params.resultRow, headArr, arrReg, params.config && params.config.flatKeys);
        key = headArr.shift();
        match = (params.config && params.config.flatKeys) ? false : key.match(arrReg);
        if (match) { // the last element is an array, we need check and treat it as an array.
          try {
            key = key.replace(match[0], '');
            if (!pointer[key] || !(pointer[key] instanceof Array)) {
              pointer[key] = [];
            }
            if (pointer[key]) {
              index = match[1];
              if (index === '') {
                index = pointer[key].length;
              }
              pointer[key][index] = params.item;
            } else {
              params.resultRow[fieldStr] = params.item;
            }
          } catch (e) {
            params.resultRow[fieldStr] = params.item;
          }
        } else {
          if (typeof pointer === "string"){
            params.resultRow[fieldStr] = params.item;
          }else{
            pointer[key] = params.item;
          }
        }
      }
    };

    },{}],11:[function(require,module,exports){
    module.exports = {
      "name": "jsonarray",
      "processSafe":true,
      "regExp": /^\*jsonarray\*/,
      "parserFunc": function parser_jsonarray (params) {
        var fieldStr = params.head.replace(this.regExp, "");
        var headArr = fieldStr.split('.');
        var pointer = params.resultRow;
        while (headArr.length > 1) {
          var headStr = headArr.shift();
          if (pointer[headStr] === undefined) {
            pointer[headStr] = {};
          }
          pointer = pointer[headStr];
        }
        var arrFieldName = headArr.shift();
        if (pointer[arrFieldName] === undefined) {
          pointer[arrFieldName] = [];
        }
        pointer[arrFieldName].push(params.item);
      }
    };

    },{}],12:[function(require,module,exports){
    module.exports = {
      "name": "omit",
      "regExp": /^\*omit\*/,
      "processSafe":true,
      "parserFunc": function parser_omit() {}
    };

    },{}],13:[function(require,module,exports){
    var csvline=require("./csvline");
    /**
     * Convert data chunk to csv lines with cols
     * @param  {[type]} data   [description]
     * @param  {[type]} params [description]
     * @return {[type]}    {lines:[[col1,col2,col3]],partial:String}
     */
    module.exports = function(fileLine, params) {
      var lines = fileLine.lines;
      var csvLines = csvline(lines,params);
      return {
        lines: csvLines.lines,
        partial: csvLines.partial + fileLine.partial
      };
    };

    },{"./csvline":5}],14:[function(require,module,exports){
    var getEol = require("./getEol");
    /**
     * convert data chunk to file lines array
     * @param  {string} data  data chunk as utf8 string
     * @param  {object} param Converter param object
     * @return {Object}   {lines:[line1,line2...],partial:String}
     */
    module.exports = function(data, param) {
      var eol = getEol(data,param);
      var lines = data.split(eol);
      var partial = lines.pop();
      return {lines: lines, partial: partial};
    };

    },{"./getEol":17}],15:[function(require,module,exports){
    module.exports=function filterRow(row, param) {
      if (param.ignoreColumns instanceof Array && param.ignoreColumns.length > 0) {
        for (var igRow = 0, igColLen = param.ignoreColumns.length; igRow < igColLen; igRow++) {
          if (param.ignoreColumns[igRow] >= 0) {
            row.splice(param.ignoreColumns[igRow], 1);
          }
        }
      }
      if (param.includeColumns instanceof Array && param.includeColumns.length > 0) {
        var cleanRowArr = [];
        for (var inRow = 0, inColLen = param.includeColumns.length; inRow < inColLen; inRow++) {
          if (param.includeColumns[inRow] >= 0) {
            cleanRowArr.push(row[param.includeColumns[inRow]]);
          }
        }
        row = cleanRowArr;
      }
      return row;
    }
    },{}],16:[function(require,module,exports){
    module.exports = getDelimiter;
    var defaulDelimiters = [",", "|", "\t", ";", ":"];
    function getDelimiter(rowStr,param) {
      var checker;
      if (param.delimiter === "auto"){
        checker = defaulDelimiters;
      } else if (param.delimiter instanceof Array) {
        checker = param.delimiter;
      } else {
        return param.delimiter;
      }
      var count = 0;
      var rtn = ",";
      checker.forEach(function(delim) {
        var delimCount = rowStr.split(delim).length;
        if (delimCount > count) {
          rtn = delim;
          count = delimCount;
        }
      });
      return rtn;
    }

    },{}],17:[function(require,module,exports){
    //return eol from a data chunk.
    var eol = require("os").EOL;
    module.exports = function(data, param) {
      if (!param.eol && data) {
        for (var i = 0, len = data.length; i < len; i++) {
          if (data[i] === "\r") {
            if (data[i + 1] === "\n") {
              param.eol = "\r\n";
            } else if (data[i + 1]) {
              param.eol = "\r";
            }
            return param.eol;
          } else if (data[i] === "\n") {
            param.eol = "\n";
            return param.eol;
          }
        }
      }
      return param.eol;
    };

    },{"os":41}],18:[function(require,module,exports){
    module.exports = constructor;
    module.exports.Converter = require("./Converter.js");

    function constructor(param,options) {
      return new module.exports.Converter(param, options);
    }

    },{"./Converter.js":4}],19:[function(require,module,exports){
    var parserMgr = require("./parserMgr.js");
    var CSVError = require("./CSVError");
    var numReg = /^[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?$/;
    /**
     * Convert lines of csv array into json
     * @param  {[type]} lines  [[col1,col2,col3]]
     * @param  {[type]} params Converter params with _headers field populated
     * @param  {[type]} idx start pos of the lines
     * @return {[type]}   [{err:null,json:obj,index:line,row:[csv row]}]
     */
    module.exports = function (lines, params, idx) {
      if (params._needParseJson) {
        if (!params._headers) {
          params._headers = [];
        }
        if (!params.parseRules) {
          var row = params._headers;
          params.parseRules = parserMgr.initParsers(row, params);
        }
        return processRows(lines, params, idx);
      } else {
        return justReturnRows(lines, params, idx);
      }
    };

    function justReturnRows(lines, params, idx) {
      var rtn = [];
      for (var i = 0, len = lines.length; i < len; i++) {
        rtn.push({
          err: null,
          json: {},
          index: idx++,
          row: lines[i]
        });
      }
      return rtn;
    }

    function processRows(csvRows, params, startIndex) {
      var res = [];
      for (var i = 0, len = csvRows.length; i < len; i++) {
        var r = processRow(csvRows[i], params, startIndex++);
        if (r) {
          res.push(r);
        }
      }
      return res;
    }

    function processRow(row, param, index) {
      var parseRules = param.parseRules;
      if (param.checkColumn && row.length !== parseRules.length) {
        return {
          err: CSVError.column_mismatched(index)
        };
      }

      var headRow = param._headers;
      var resultRow = convertRowToJson(row, headRow, param);
      if (resultRow) {
        return {
          json: resultRow,
          index: index,
          row: row
        };
      } else {
        return null;
      }
    }

    function convertRowToJson(row, headRow, param) {
      var hasValue = false;
      var resultRow = {};

      for (var i = 0, len = row.length; i < len; i++) {
        var convertFunc, head, item;
        item = row[i];

        if (param.ignoreEmpty && item === '') {
          continue;
        }
        hasValue = true;

        head = headRow[i];
        if (!head || head === "") {
          head = headRow[i] = "field" + (i + 1);
        }
        var convFunc = getConvFunc(head, i, param);
        if (convFunc) {
          var convRes = convFunc(item, head, resultRow,row,i);
          if (convRes !== undefined) {
            setPath(resultRow, head, convRes);
          }
        } else {
          var flag = getFlag(head, i, param);
          if (flag === 'omit') {
            continue;
          }
          if (param.checkType) {
            convertFunc = checkType(item, head, i, param);
            item = convertFunc(item);
          }
          var title = getTitle(head, i, param);
          if (flag === 'flat' || param.flatKeys) {
            resultRow[title] = item;
          } else {
            setPath(resultRow, title, item);
          }
        }
      }
      if (hasValue) {
        return resultRow;
      } else {
        return false;
      }
    }

    var builtInConv={
      "string":stringType,
      "number":numberType,
      "omit":function(){}
    }
    function getConvFunc(head,i,param){
      if (param._columnConv[i] !== undefined){
        return param._columnConv[i];
      }else{
        var flag=param.colParser[head];
        if (flag === undefined){
          return param._columnConv[i]=false;
        }
        if (typeof flag ==="string"){
          flag=flag.trim().toLowerCase();
          var builtInFunc=builtInConv[flag];
          if (builtInFunc){
            return param._columnConv[i]=builtInFunc;
          }else{
            return param._columnConv[i]=false;
          }
        }else if (typeof flag ==="function"){
          return param._columnConv[i]=flag;
        }else{
          return param._columnConv[i]=false;
        }
      }
    }
    function setPath(json, path, value) {
      var _set = require('lodash/set');
      var pathArr = path.split('.');
      if (pathArr.length === 1) {
        json[path] = value;
      } else {
        _set(json, path, value);
      }
    }

    function getFlag(head, i, param) {
      if (typeof param._headerFlag[i] === "string") {
        return param._headerFlag[i];
      } else if (head.indexOf('*omit*') > -1) {
        return param._headerFlag[i] = 'omit';
      } else if (head.indexOf('*flat*') > -1) {
        return param._headerFlag[i] = 'flat';
      } else {
        return param._headerFlag[i] = '';
      }
    }

    function getTitle(head, i, param) {
      if (param._headerTitle[i]) {
        return param._headerTitle[i];
      }

      var flag = getFlag(head, i, param);
      var str = head.replace('*flat*', '').replace('string#!', '').replace('number#!', '');
      return param._headerTitle[i] = str;
    }

    function checkType(item, head, headIdx, param) {
      if (param._headerType[headIdx]) {
        return param._headerType[headIdx];
      } else if (head.indexOf('number#!') > -1) {
        return param._headerType[headIdx] = numberType;
      } else if (head.indexOf('string#!') > -1) {
        return param._headerType[headIdx] = stringType;
      } else if (param.checkType) {
        return param._headerType[headIdx] = dynamicType;
      } else {
        return param._headerType[headIdx] = stringType;
      }
    }

    function numberType(item) {
      var rtn = parseFloat(item);
      if (isNaN(rtn)) {
        return item;
      }
      return rtn;
    }

    function stringType(item) {
      return item.toString();
    }

    function dynamicType(item) {
      var trimed = item.trim();
      if (trimed === "") {
        return stringType(item);
      }
      if (numReg.test(trimed)) {
        return numberType(item);
      } else if (trimed.length === 5 && trimed.toLowerCase() === "false" || trimed.length === 4 && trimed.toLowerCase() === "true") {
        return booleanType(item);
      } else if (trimed[0] === "{" && trimed[trimed.length - 1] === "}" || trimed[0] === "[" && trimed[trimed.length - 1] === "]") {
        return jsonType(item);
      } else {
        return stringType(item);
      }
    }

    function booleanType(item) {
      var trimed = item.trim();
      if (trimed.length === 5 && trimed.toLowerCase() === "false") {
        return false;
      } else {
        return true;
      }
    }

    function jsonType(item) {
      try {
        return JSON.parse(item);
      } catch (e) {
        return item;
      }
    }

    },{"./CSVError":3,"./parserMgr.js":21,"lodash/set":131}],20:[function(require,module,exports){
    var explicitTypes = ["number", "string"];

    function Parser(name, regExp, parser, processSafe) {
      this.name = typeof name === "undefined" ? "Default" : name;
      this.regExp = null;
      this.type = "";
      this.processSafe = processSafe;
      if (typeof regExp !== "undefined") {
        if (typeof regExp === "string") {
          this.regExp = new RegExp(regExp);
        } else {
          this.regExp = regExp;
        }
      }
      if (typeof parser !== "undefined") {
        this.parse = parser;
      }
    }
    // var numReg = /^[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?$/;
    Parser.prototype.convertType = function(item) {
      var type=this.type;
      if (type === 'number') {
        var rtn = parseFloat(item);
        if (isNaN(rtn)) {
          return 0;
        } else {
          return rtn;
        }
      } else if (this.param && this.param.checkType && type === '') {
        var trimed = item.trim();
        if (trimed === ""){
          return trimed;
        }
        if (!isNaN(trimed)) {
          return parseFloat(trimed);
        } else if (trimed.length === 5 && trimed.toLowerCase() === "false") {
          return false;
        } else if (trimed.length === 4 && trimed.toLowerCase() === "true") {
          return true;
        } else if (trimed[0] === "{" && trimed[trimed.length - 1] === "}" || trimed[0] === "[" && trimed[trimed.length - 1]==="]") {
          try {
            return JSON.parse(trimed);
          } catch (e) {
            return item;
          }
        } else {
          return item;
        }
      }
      return item;
    };

    Parser.prototype.setParam = function(param) {
      this.param = param;
    };

    Parser.prototype.test = function(str) {
      return this.regExp && this.regExp.test(str);
    };

    Parser.prototype.parse = function(params) {
      params.resultRow[params.head] = params.item;
    };

    Parser.prototype.getHeadStr = function() {
      if (this.headStr) {
        return this.headStr;
      } else {
        var head = this.head;
        this.headStr = head.replace(this.regExp, '');
        if (!this.headStr) {
          this.headStr = "Unknown Header";
        }
        return this.getHeadStr();
      }
    };

    Parser.prototype.getHead = function() {
      return this.head;
    };

    Parser.prototype.initHead = function(columnTitle) {
      this.head = columnTitle;
      var wholeHead = columnTitle.replace(this.regExp, '');
      //init type && headStr
      var splitArr = wholeHead.split("#!");
      if (splitArr.length === 1) { //no explicit type
        this.headStr = splitArr[0];
      } else {
        var type = splitArr.shift();
        if (explicitTypes.indexOf(type.toLowerCase()) > -1) {
          this.type = type;
          this.headStr = splitArr.join("#!");
        } else { //no explicit type
          this.headStr = wholeHead;
        }
      }
      if (!this.headStr) {
        this.headStr = wholeHead ? wholeHead : "Unknown Head";
      }
    };

    Parser.prototype.clone = function() {
      var obj = Object.create(this);
      var newParser = new Parser();
      for (var key in obj) {
        newParser[key] = obj[key];
      }
      return newParser;
    };

    Parser.prototype.getName = function() {
      return this.name;
    };

    module.exports = Parser;

    },{}],21:[function(require,module,exports){
    //implementation
    var registeredParsers = [];
    var Parser = require("./parser.js");
    var defaultParser = require("./defaultParsers");

    function registerParser (parser) {
      if (parser instanceof Parser && registeredParsers.indexOf(parser) === -1) {
        registeredParsers.push(parser); // TODO indexOf doesn't work with object references
      }
    }

    function getParser(columnTitle, param) {
      var inst, parser;
      function getParserByName(parserName) {
        var parser;
        registeredParsers.forEach(function(p){
          if (p.getName() === parserName){
            parser = p;
          }
        });
        if (parser) {
          var inst = parser.clone();
          return inst;
        }
        return new Parser(); //TODO remove new
      }
      columnTitle = columnTitle ? columnTitle : '';
      registeredParsers.forEach(function(p) {
        if (p.test(columnTitle)) {
          parser=p;
        }
      });
      if (parser) {
        inst = parser.clone();
        inst.head = columnTitle;
      } else {
        inst = getParserByName("json", columnTitle);
      }
      inst.setParam(param);
      inst.initHead(columnTitle);
      return inst;
    }

    function addParser(name, regExp, parseFunc) {
      var parser = new Parser(name, regExp, parseFunc,false); //TODO remove new
      registerParser(parser);
    }

    function addSafeParser(parserPath) {
      //TODO impl
    }

    function initParsers(row, param) {
      var parsers = [];
      row.forEach(function (columnTitle) {
        parsers.push(getParser(columnTitle, param));
      });
      return parsers;
    }

    defaultParser.forEach(function (parserCfg){
      //TODO refactor this
      addParser(parserCfg.name, parserCfg.regExp, parserCfg.parserFunc, parserCfg.processSafe);
    });

    //module interfaces
    module.exports.addParser = addParser;
    module.exports.initParsers = initParsers;
    module.exports.getParser = getParser;

    },{"./defaultParsers":7,"./parser.js":20}],22:[function(require,module,exports){
    var getDelimiter = require("./getDelimiter");
    var filterRow=require("./filterRow");
    /**
     * Convert a line of string to csv columns according to its delimiter
     * the param._header may not be ready when this is called.
     * @param  {[type]} rowStr [description]
     * @param  {[type]} param  [Converter param]
     * @return {[type]}        {cols:["a","b","c"],closed:boolean} the closed field indicate if the row is a complete row
     */
    module.exports = function rowSplit(rowStr, param) {
      if (rowStr === "") {
        return { cols: [], closed: true };
      }
      var quote = param.quote;
      var trim = param.trim;
      var escape = param.escape;
      if (param.delimiter instanceof Array || param.delimiter.toLowerCase() === "auto") {
        param.delimiter = getDelimiter(rowStr, param);
      }
      var delimiter = param.delimiter;
      var rowArr = rowStr.split(delimiter);
      if (quote === "off") {
        return { cols: rowArr, closed: true };
      }
      var row = [];
      var inquote = false;
      var quoteBuff = '';
      for (var i = 0, rowLen = rowArr.length; i < rowLen; i++) {
        var e = rowArr[i];
        if (!inquote && trim) {
          e = e.trim();
        }
        var len = e.length;
        if (!inquote) {
          if (isQuoteOpen(e, param)) { //quote open
            e = e.substr(1);
            if (isQuoteClose(e, param)) { //quote close
              e = e.substring(0, e.length - 1);
              e = _escapeQuote(e, quote, escape);
              row.push(e);
              continue;
            } else {
              inquote = true;
              quoteBuff += e;
              continue;
            }
          } else {
            row.push(e);
            continue;
          }
        } else { //previous quote not closed
          if (isQuoteClose(e, param)) { //close double quote
            inquote = false;
            e = e.substr(0, len - 1);
            quoteBuff += delimiter + e;
            quoteBuff = _escapeQuote(quoteBuff, quote, escape);
            if (trim) {
              quoteBuff = quoteBuff.trimRight();
            }
            row.push(quoteBuff);
            quoteBuff = "";
          } else {
            quoteBuff += delimiter + e;
          }
        }
      }

      if (!inquote && param._needFilterRow) {
        row = filterRow(row, param);
      }

      return { cols: row, closed: !inquote };
      // if (param.workerNum<=1){
      // }else{
      //   if (inquote && quoteBuff.length>0){//for multi core, quote will be closed at the end of line
      //     quoteBuff=_escapeQuote(quoteBuff,quote,escape);;
      //     if (trim){
      //       quoteBuff=quoteBuff.trimRight();
      //     }
      //     row.push(quoteBuff);
      //   }
      //   return {cols:row,closed:true};
      // }

    };

    function isQuoteOpen(str, param) {
      var quote = param.quote;
      var escape = param.escape;
      return str[0] === quote && (
        str[1] !== quote ||
        str[1] === escape && (str[2] === quote || str.length === 2));
    }
    function isQuoteClose(str, param) {
      var quote = param.quote;
      var count = 0;
      var idx = str.length - 1;
      var escape = param.escape;
      while (str[idx] === quote || str[idx] === escape) {
        idx--;
        count++;
      }
      return count % 2 !== 0;
    }

    function twoDoubleQuote(str, quote) {
      var twoQuote = quote + quote;
      var curIndex = -1;
      while ((curIndex = str.indexOf(twoQuote, curIndex)) > -1) {
        str = str.substring(0, curIndex) + str.substring(++curIndex);
      }
      return str;
    }

    var cachedRegExp = {};
    function _escapeQuote(segment, quote, escape) {

      var key = "es|" + quote + "|" + escape;
      if (cachedRegExp[key] === undefined) {
        if (escape === "\\") {
          escape = "\\\\";
        }
        cachedRegExp[key] = new RegExp(escape + quote, 'g');
      }
      var regExp = cachedRegExp[key];
      return segment.replace(regExp, quote);
    }

    },{"./filterRow":15,"./getDelimiter":16}],23:[function(require,module,exports){
    (function (process,__dirname){
    module.exports = workerMgr;
    var spawn = require("child_process").spawn;
    var eom = "\x03";
    var eom1 = "\x0e";
    var eom2 = "\x0f";
    var CSVError = require('./CSVError');
    function workerMgr() {

      var exports = {
        initWorker: initWorker,
        sendWorker: sendWorker,
        setParams: setParams,
        drain: function(){},
        isRunning: isRunning,
        destroyWorker: destroyWorker
      };
      var workers = [];
      var running = 0;
      var waiting = null;
      function initWorker(num, params) {
        workers = [];
        running = 0;
        waiting = null;
        for (var i = 0; i < num; i++) {
          workers.push(new Worker(params));
        }

      }
      function isRunning() {
        return running > 0;
      }
      function destroyWorker() {
        workers.forEach(function(w) {
          w.destroy();
        });
      }

      function sendWorker(data, startIdx, transformCb, cbResult) {
        if (workers.length > 0) {
          var worker = workers.shift();
          running++;
          worker.parse(data, startIdx, function(result) {
            // var arr=JSON.parse(result);
            // arr.forEach(function(item){
            //   console.log('idx',item.index)
            // })
            workers.push(worker);
            cbResult(result, startIdx);
            running--;
            if (waiting === null && running === 0) {
              exports.drain();
            } else if (waiting) {
              sendWorker.apply(this, waiting);
              waiting = null;
            }
          });
          process.nextTick(transformCb);
        } else {
          waiting = [data, startIdx, transformCb, cbResult];
        }
      }

      function setParams(params) {
        workers.forEach(function(w) {
          w.setParams(params);
        });
      }
      return exports;
    }

    function Worker(params) {
      this.cp = spawn(process.execPath, [__dirname + "/worker.js"], {
        env: {
          child:true
        },
        stdio:['pipe', 'pipe', 2, 'ipc']
        // stdio:[0,1,2,'ipc']
      });
      this.setParams(params);
      this.cp.on("message", this.onChildMsg.bind(this));
      this.buffer = "";
      var self = this;
      this.cp.stdout.on("data", function(d) {
        var str = d.toString("utf8");
        var all = self.buffer + str;
        var cmdArr = all.split(eom);
        while (cmdArr.length > 1) {
          self.onChildMsg(cmdArr.shift());
        }
        self.buffer = cmdArr[0];
      });
    }

    Worker.prototype.setParams = function(params) {
      var msg = "0" + JSON.stringify(params);
      this.sendMsg(msg);
    };

    /**
     * msg is like:
     * <cmd><data>
     * cmd is from 0-9
     */
    Worker.prototype.onChildMsg = function(msg) {
      if (msg) {
        var cmd = msg[0];
        var data = msg.substr(1);
        switch (cmd) {
          case "0": //total line number of current chunk
            if (this.cbLine) {
              var sp = data.split("|");
              var len = parseInt(sp[0]);
              var partial = sp[1];
              this.cbLine(len, partial);
            }
            break;
          case "1": // json array of current chunk
            if (this.cbResult) {
              var rows = data.split(eom1);
              rows.pop();
              var res = [];
              rows.forEach(function(row) {
                var sp = row.split(eom2);
                res.push({
                  index: sp[0],
                  row: sp[1],
                  err: sp[2] ? CSVError.fromArray(JSON.parse(sp[2])) : null,
                  json: sp[3]
                });
              });
              this.cbResult(res);
            }
            break;
        }
      }
    };

    Worker.prototype.parse = function(data, startIdx, cbResult) {
      this.cbResult = cbResult;
      var msg = "1" + startIdx + "|" + data;
      this.sendMsg(msg);
    };

    Worker.prototype.destroy = function() {
      this.cp.kill();
    };

    Worker.prototype.sendMsg = function(msg) {
      this.cp.stdin.write(msg + eom, "utf8");
      // this.cp.send(msg)
    };

    }).call(this,require('_process'),"/libs/core")
    },{"./CSVError":3,"_process":42,"child_process":31}],24:[function(require,module,exports){
    //deprecated but leave it for backword compatibility
    module.exports.core=require("./core");

    //live apis
    module.exports=require("./core");
    module.exports.interfaces = require("./interfaces");

    },{"./core":18,"./interfaces":27}],25:[function(require,module,exports){
    module.exports = require("./main.js");
    },{"./main.js":26}],26:[function(require,module,exports){
    (function (process){
    /**
     * Convert input to process stdout
     */

    //implementation
    var Converter = require("../../core/Converter.js");
    function _initConverter(){
        var csvConverter = new Converter();
        var started = false;
        var writeStream = process.stdout;
        csvConverter.on("record_parsed",function(rowJSON){
            if (started){
                writeStream.write(",\n");
            }
            writeStream.write(JSON.stringify(rowJSON));  //write parsed JSON object one by one.
            if (started === false){
                started = true;
            }
        });
        writeStream.write("[\n"); //write array symbol

        csvConverter.on("end_parsed",function(){
            writeStream.write("\n]"); //end array symbol
        });
        csvConverter.on("error",function(err){
            console.error(err);
            process.exit(-1);
        });
        return csvConverter;
    }
    function convertFile(fileName){
        var csvConverter=_initConverter();
        csvConverter.from(fileName);
    }

    function convertString(csvString){
        var csvConverter=_initConverter();
        csvConverter.from(csvString);
    }
    //module interfaces
    module.exports.convertFile = convertFile;
    module.exports.convertString = convertString;
    }).call(this,require('_process'))
    },{"../../core/Converter.js":4,"_process":42}],27:[function(require,module,exports){
    module.exports.web=require("./web");
    module.exports.cli=require("./cli");
    },{"./cli":25,"./web":28}],28:[function(require,module,exports){
    module.exports = require("./webServer.js");
    },{"./webServer.js":29}],29:[function(require,module,exports){
    var http = require("http");
    var Converter = require("../../core/Converter.js");
    function startWebServer (args) {
        args = args || {};
        var serverArgs = {
            port: args.port || '8801',
            urlpath: args.urlpath || '/parseCSV'
        };
        var server = http.createServer();
        server.on("request", function(req, res){
            if (req.url === serverArgs.urlpath && req.method === "POST"){
                req.pipe(new Converter({constructResult:false})).pipe(res);
            } else {
                res.end("Please post data to: " + serverArgs.urlpath);
            }
        });

        server.listen(serverArgs.port);
        console.log("CSV Web Server Listen On:" + serverArgs.port);
        console.log("POST to " + serverArgs.urlpath + " with CSV data to get parsed.");
        return server;
    }
    module.exports.startWebServer = startWebServer;

    },{"../../core/Converter.js":4,"http":61}],30:[function(require,module,exports){
    (function (Buffer){
    'use strict';
    var util = require('util');
    var Transform = require('stream').Transform;

    function ctor(options, transform) {
    	util.inherits(FirstChunk, Transform);

    	if (typeof options === 'function') {
    		transform = options;
    		options = {};
    	}

    	if (typeof transform !== 'function') {
    		throw new Error('transform function required');
    	}

    	function FirstChunk(options2) {
    		if (!(this instanceof FirstChunk)) {
    			return new FirstChunk(options2);
    		}

    		Transform.call(this, options2);

    		this._firstChunk = true;
    		this._transformCalled = false;
    		this._minSize = options.minSize;
    	}

    	FirstChunk.prototype._transform = function (chunk, enc, cb) {
    		this._enc = enc;

    		if (this._firstChunk) {
    			this._firstChunk = false;

    			if (this._minSize == null) {
    				transform.call(this, chunk, enc, cb);
    				this._transformCalled = true;
    				return;
    			}

    			this._buffer = chunk;
    			cb();
    			return;
    		}

    		if (this._minSize == null) {
    			this.push(chunk);
    			cb();
    			return;
    		}

    		if (this._buffer.length < this._minSize) {
    			this._buffer = Buffer.concat([this._buffer, chunk]);
    			cb();
    			return;
    		}

    		if (this._buffer.length >= this._minSize) {
    			transform.call(this, this._buffer.slice(), enc, function () {
    				this.push(chunk);
    				cb();
    			}.bind(this));
    			this._transformCalled = true;
    			this._buffer = false;
    			return;
    		}

    		this.push(chunk);
    		cb();
    	};

    	FirstChunk.prototype._flush = function (cb) {
    		if (!this._buffer) {
    			cb();
    			return;
    		}

    		if (this._transformCalled) {
    			this.push(this._buffer);
    			cb();
    		} else {
    			transform.call(this, this._buffer.slice(), this._enc, cb);
    		}
    	};

    	return FirstChunk;
    }

    module.exports = function () {
    	return ctor.apply(ctor, arguments)();
    };

    module.exports.ctor = ctor;

    }).call(this,require("buffer").Buffer)
    },{"buffer":33,"stream":60,"util":73}],31:[function(require,module,exports){

    },{}],32:[function(require,module,exports){
    arguments[4][31][0].apply(exports,arguments)
    },{"dup":31}],33:[function(require,module,exports){
    (function (global){
    /*!
     * The buffer module from node.js, for the browser.
     *
     * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
     * @license  MIT
     */
    /* eslint-disable no-proto */

    'use strict'

    var base64 = require('base64-js')
    var ieee754 = require('ieee754')
    var isArray = require('isarray')

    exports.Buffer = Buffer
    exports.SlowBuffer = SlowBuffer
    exports.INSPECT_MAX_BYTES = 50
    Buffer.poolSize = 8192 // not used by this implementation

    var rootParent = {}

    /**
     * If `Buffer.TYPED_ARRAY_SUPPORT`:
     *   === true    Use Uint8Array implementation (fastest)
     *   === false   Use Object implementation (most compatible, even IE6)
     *
     * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
     * Opera 11.6+, iOS 4.2+.
     *
     * Due to various browser bugs, sometimes the Object implementation will be used even
     * when the browser supports typed arrays.
     *
     * Note:
     *
     *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
     *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
     *
     *   - Safari 5-7 lacks support for changing the `Object.prototype.constructor` property
     *     on objects.
     *
     *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
     *
     *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
     *     incorrect length in some situations.

     * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
     * get the Object implementation, which is slower but behaves correctly.
     */
    Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
      ? global.TYPED_ARRAY_SUPPORT
      : typedArraySupport()

    function typedArraySupport () {
      function Bar () {}
      try {
        var arr = new Uint8Array(1)
        arr.foo = function () { return 42 }
        arr.constructor = Bar
        return arr.foo() === 42 && // typed array instances can be augmented
            arr.constructor === Bar && // constructor can be set
            typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
            arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
      } catch (e) {
        return false
      }
    }

    function kMaxLength () {
      return Buffer.TYPED_ARRAY_SUPPORT
        ? 0x7fffffff
        : 0x3fffffff
    }

    /**
     * Class: Buffer
     * =============
     *
     * The Buffer constructor returns instances of `Uint8Array` that are augmented
     * with function properties for all the node `Buffer` API functions. We use
     * `Uint8Array` so that square bracket notation works as expected -- it returns
     * a single octet.
     *
     * By augmenting the instances, we can avoid modifying the `Uint8Array`
     * prototype.
     */
    function Buffer (arg) {
      if (!(this instanceof Buffer)) {
        // Avoid going through an ArgumentsAdaptorTrampoline in the common case.
        if (arguments.length > 1) return new Buffer(arg, arguments[1])
        return new Buffer(arg)
      }

      if (!Buffer.TYPED_ARRAY_SUPPORT) {
        this.length = 0
        this.parent = undefined
      }

      // Common case.
      if (typeof arg === 'number') {
        return fromNumber(this, arg)
      }

      // Slightly less common case.
      if (typeof arg === 'string') {
        return fromString(this, arg, arguments.length > 1 ? arguments[1] : 'utf8')
      }

      // Unusual.
      return fromObject(this, arg)
    }

    function fromNumber (that, length) {
      that = allocate(that, length < 0 ? 0 : checked(length) | 0)
      if (!Buffer.TYPED_ARRAY_SUPPORT) {
        for (var i = 0; i < length; i++) {
          that[i] = 0
        }
      }
      return that
    }

    function fromString (that, string, encoding) {
      if (typeof encoding !== 'string' || encoding === '') encoding = 'utf8'

      // Assumption: byteLength() return value is always < kMaxLength.
      var length = byteLength(string, encoding) | 0
      that = allocate(that, length)

      that.write(string, encoding)
      return that
    }

    function fromObject (that, object) {
      if (Buffer.isBuffer(object)) return fromBuffer(that, object)

      if (isArray(object)) return fromArray(that, object)

      if (object == null) {
        throw new TypeError('must start with number, buffer, array or string')
      }

      if (typeof ArrayBuffer !== 'undefined') {
        if (object.buffer instanceof ArrayBuffer) {
          return fromTypedArray(that, object)
        }
        if (object instanceof ArrayBuffer) {
          return fromArrayBuffer(that, object)
        }
      }

      if (object.length) return fromArrayLike(that, object)

      return fromJsonObject(that, object)
    }

    function fromBuffer (that, buffer) {
      var length = checked(buffer.length) | 0
      that = allocate(that, length)
      buffer.copy(that, 0, 0, length)
      return that
    }

    function fromArray (that, array) {
      var length = checked(array.length) | 0
      that = allocate(that, length)
      for (var i = 0; i < length; i += 1) {
        that[i] = array[i] & 255
      }
      return that
    }

    // Duplicate of fromArray() to keep fromArray() monomorphic.
    function fromTypedArray (that, array) {
      var length = checked(array.length) | 0
      that = allocate(that, length)
      // Truncating the elements is probably not what people expect from typed
      // arrays with BYTES_PER_ELEMENT > 1 but it's compatible with the behavior
      // of the old Buffer constructor.
      for (var i = 0; i < length; i += 1) {
        that[i] = array[i] & 255
      }
      return that
    }

    function fromArrayBuffer (that, array) {
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        // Return an augmented `Uint8Array` instance, for best performance
        array.byteLength
        that = Buffer._augment(new Uint8Array(array))
      } else {
        // Fallback: Return an object instance of the Buffer class
        that = fromTypedArray(that, new Uint8Array(array))
      }
      return that
    }

    function fromArrayLike (that, array) {
      var length = checked(array.length) | 0
      that = allocate(that, length)
      for (var i = 0; i < length; i += 1) {
        that[i] = array[i] & 255
      }
      return that
    }

    // Deserialize { type: 'Buffer', data: [1,2,3,...] } into a Buffer object.
    // Returns a zero-length buffer for inputs that don't conform to the spec.
    function fromJsonObject (that, object) {
      var array
      var length = 0

      if (object.type === 'Buffer' && isArray(object.data)) {
        array = object.data
        length = checked(array.length) | 0
      }
      that = allocate(that, length)

      for (var i = 0; i < length; i += 1) {
        that[i] = array[i] & 255
      }
      return that
    }

    if (Buffer.TYPED_ARRAY_SUPPORT) {
      Buffer.prototype.__proto__ = Uint8Array.prototype
      Buffer.__proto__ = Uint8Array
    } else {
      // pre-set for values that may exist in the future
      Buffer.prototype.length = undefined
      Buffer.prototype.parent = undefined
    }

    function allocate (that, length) {
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        // Return an augmented `Uint8Array` instance, for best performance
        that = Buffer._augment(new Uint8Array(length))
        that.__proto__ = Buffer.prototype
      } else {
        // Fallback: Return an object instance of the Buffer class
        that.length = length
        that._isBuffer = true
      }

      var fromPool = length !== 0 && length <= Buffer.poolSize >>> 1
      if (fromPool) that.parent = rootParent

      return that
    }

    function checked (length) {
      // Note: cannot use `length < kMaxLength` here because that fails when
      // length is NaN (which is otherwise coerced to zero.)
      if (length >= kMaxLength()) {
        throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                             'size: 0x' + kMaxLength().toString(16) + ' bytes')
      }
      return length | 0
    }

    function SlowBuffer (subject, encoding) {
      if (!(this instanceof SlowBuffer)) return new SlowBuffer(subject, encoding)

      var buf = new Buffer(subject, encoding)
      delete buf.parent
      return buf
    }

    Buffer.isBuffer = function isBuffer (b) {
      return !!(b != null && b._isBuffer)
    }

    Buffer.compare = function compare (a, b) {
      if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
        throw new TypeError('Arguments must be Buffers')
      }

      if (a === b) return 0

      var x = a.length
      var y = b.length

      var i = 0
      var len = Math.min(x, y)
      while (i < len) {
        if (a[i] !== b[i]) break

        ++i
      }

      if (i !== len) {
        x = a[i]
        y = b[i]
      }

      if (x < y) return -1
      if (y < x) return 1
      return 0
    }

    Buffer.isEncoding = function isEncoding (encoding) {
      switch (String(encoding).toLowerCase()) {
        case 'hex':
        case 'utf8':
        case 'utf-8':
        case 'ascii':
        case 'binary':
        case 'base64':
        case 'raw':
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return true
        default:
          return false
      }
    }

    Buffer.concat = function concat (list, length) {
      if (!isArray(list)) throw new TypeError('list argument must be an Array of Buffers.')

      if (list.length === 0) {
        return new Buffer(0)
      }

      var i
      if (length === undefined) {
        length = 0
        for (i = 0; i < list.length; i++) {
          length += list[i].length
        }
      }

      var buf = new Buffer(length)
      var pos = 0
      for (i = 0; i < list.length; i++) {
        var item = list[i]
        item.copy(buf, pos)
        pos += item.length
      }
      return buf
    }

    function byteLength (string, encoding) {
      if (typeof string !== 'string') string = '' + string

      var len = string.length
      if (len === 0) return 0

      // Use a for loop to avoid recursion
      var loweredCase = false
      for (;;) {
        switch (encoding) {
          case 'ascii':
          case 'binary':
          // Deprecated
          case 'raw':
          case 'raws':
            return len
          case 'utf8':
          case 'utf-8':
            return utf8ToBytes(string).length
          case 'ucs2':
          case 'ucs-2':
          case 'utf16le':
          case 'utf-16le':
            return len * 2
          case 'hex':
            return len >>> 1
          case 'base64':
            return base64ToBytes(string).length
          default:
            if (loweredCase) return utf8ToBytes(string).length // assume utf8
            encoding = ('' + encoding).toLowerCase()
            loweredCase = true
        }
      }
    }
    Buffer.byteLength = byteLength

    function slowToString (encoding, start, end) {
      var loweredCase = false

      start = start | 0
      end = end === undefined || end === Infinity ? this.length : end | 0

      if (!encoding) encoding = 'utf8'
      if (start < 0) start = 0
      if (end > this.length) end = this.length
      if (end <= start) return ''

      while (true) {
        switch (encoding) {
          case 'hex':
            return hexSlice(this, start, end)

          case 'utf8':
          case 'utf-8':
            return utf8Slice(this, start, end)

          case 'ascii':
            return asciiSlice(this, start, end)

          case 'binary':
            return binarySlice(this, start, end)

          case 'base64':
            return base64Slice(this, start, end)

          case 'ucs2':
          case 'ucs-2':
          case 'utf16le':
          case 'utf-16le':
            return utf16leSlice(this, start, end)

          default:
            if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
            encoding = (encoding + '').toLowerCase()
            loweredCase = true
        }
      }
    }

    Buffer.prototype.toString = function toString () {
      var length = this.length | 0
      if (length === 0) return ''
      if (arguments.length === 0) return utf8Slice(this, 0, length)
      return slowToString.apply(this, arguments)
    }

    Buffer.prototype.equals = function equals (b) {
      if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
      if (this === b) return true
      return Buffer.compare(this, b) === 0
    }

    Buffer.prototype.inspect = function inspect () {
      var str = ''
      var max = exports.INSPECT_MAX_BYTES
      if (this.length > 0) {
        str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
        if (this.length > max) str += ' ... '
      }
      return '<Buffer ' + str + '>'
    }

    Buffer.prototype.compare = function compare (b) {
      if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
      if (this === b) return 0
      return Buffer.compare(this, b)
    }

    Buffer.prototype.indexOf = function indexOf (val, byteOffset) {
      if (byteOffset > 0x7fffffff) byteOffset = 0x7fffffff
      else if (byteOffset < -0x80000000) byteOffset = -0x80000000
      byteOffset >>= 0

      if (this.length === 0) return -1
      if (byteOffset >= this.length) return -1

      // Negative offsets start from the end of the buffer
      if (byteOffset < 0) byteOffset = Math.max(this.length + byteOffset, 0)

      if (typeof val === 'string') {
        if (val.length === 0) return -1 // special case: looking for empty string always fails
        return String.prototype.indexOf.call(this, val, byteOffset)
      }
      if (Buffer.isBuffer(val)) {
        return arrayIndexOf(this, val, byteOffset)
      }
      if (typeof val === 'number') {
        if (Buffer.TYPED_ARRAY_SUPPORT && Uint8Array.prototype.indexOf === 'function') {
          return Uint8Array.prototype.indexOf.call(this, val, byteOffset)
        }
        return arrayIndexOf(this, [ val ], byteOffset)
      }

      function arrayIndexOf (arr, val, byteOffset) {
        var foundIndex = -1
        for (var i = 0; byteOffset + i < arr.length; i++) {
          if (arr[byteOffset + i] === val[foundIndex === -1 ? 0 : i - foundIndex]) {
            if (foundIndex === -1) foundIndex = i
            if (i - foundIndex + 1 === val.length) return byteOffset + foundIndex
          } else {
            foundIndex = -1
          }
        }
        return -1
      }

      throw new TypeError('val must be string, number or Buffer')
    }

    // `get` is deprecated
    Buffer.prototype.get = function get (offset) {
      console.log('.get() is deprecated. Access using array indexes instead.')
      return this.readUInt8(offset)
    }

    // `set` is deprecated
    Buffer.prototype.set = function set (v, offset) {
      console.log('.set() is deprecated. Access using array indexes instead.')
      return this.writeUInt8(v, offset)
    }

    function hexWrite (buf, string, offset, length) {
      offset = Number(offset) || 0
      var remaining = buf.length - offset
      if (!length) {
        length = remaining
      } else {
        length = Number(length)
        if (length > remaining) {
          length = remaining
        }
      }

      // must be an even number of digits
      var strLen = string.length
      if (strLen % 2 !== 0) throw new Error('Invalid hex string')

      if (length > strLen / 2) {
        length = strLen / 2
      }
      for (var i = 0; i < length; i++) {
        var parsed = parseInt(string.substr(i * 2, 2), 16)
        if (isNaN(parsed)) throw new Error('Invalid hex string')
        buf[offset + i] = parsed
      }
      return i
    }

    function utf8Write (buf, string, offset, length) {
      return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
    }

    function asciiWrite (buf, string, offset, length) {
      return blitBuffer(asciiToBytes(string), buf, offset, length)
    }

    function binaryWrite (buf, string, offset, length) {
      return asciiWrite(buf, string, offset, length)
    }

    function base64Write (buf, string, offset, length) {
      return blitBuffer(base64ToBytes(string), buf, offset, length)
    }

    function ucs2Write (buf, string, offset, length) {
      return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
    }

    Buffer.prototype.write = function write (string, offset, length, encoding) {
      // Buffer#write(string)
      if (offset === undefined) {
        encoding = 'utf8'
        length = this.length
        offset = 0
      // Buffer#write(string, encoding)
      } else if (length === undefined && typeof offset === 'string') {
        encoding = offset
        length = this.length
        offset = 0
      // Buffer#write(string, offset[, length][, encoding])
      } else if (isFinite(offset)) {
        offset = offset | 0
        if (isFinite(length)) {
          length = length | 0
          if (encoding === undefined) encoding = 'utf8'
        } else {
          encoding = length
          length = undefined
        }
      // legacy write(string, encoding, offset, length) - remove in v0.13
      } else {
        var swap = encoding
        encoding = offset
        offset = length | 0
        length = swap
      }

      var remaining = this.length - offset
      if (length === undefined || length > remaining) length = remaining

      if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
        throw new RangeError('attempt to write outside buffer bounds')
      }

      if (!encoding) encoding = 'utf8'

      var loweredCase = false
      for (;;) {
        switch (encoding) {
          case 'hex':
            return hexWrite(this, string, offset, length)

          case 'utf8':
          case 'utf-8':
            return utf8Write(this, string, offset, length)

          case 'ascii':
            return asciiWrite(this, string, offset, length)

          case 'binary':
            return binaryWrite(this, string, offset, length)

          case 'base64':
            // Warning: maxLength not taken into account in base64Write
            return base64Write(this, string, offset, length)

          case 'ucs2':
          case 'ucs-2':
          case 'utf16le':
          case 'utf-16le':
            return ucs2Write(this, string, offset, length)

          default:
            if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
            encoding = ('' + encoding).toLowerCase()
            loweredCase = true
        }
      }
    }

    Buffer.prototype.toJSON = function toJSON () {
      return {
        type: 'Buffer',
        data: Array.prototype.slice.call(this._arr || this, 0)
      }
    }

    function base64Slice (buf, start, end) {
      if (start === 0 && end === buf.length) {
        return base64.fromByteArray(buf)
      } else {
        return base64.fromByteArray(buf.slice(start, end))
      }
    }

    function utf8Slice (buf, start, end) {
      end = Math.min(buf.length, end)
      var res = []

      var i = start
      while (i < end) {
        var firstByte = buf[i]
        var codePoint = null
        var bytesPerSequence = (firstByte > 0xEF) ? 4
          : (firstByte > 0xDF) ? 3
          : (firstByte > 0xBF) ? 2
          : 1

        if (i + bytesPerSequence <= end) {
          var secondByte, thirdByte, fourthByte, tempCodePoint

          switch (bytesPerSequence) {
            case 1:
              if (firstByte < 0x80) {
                codePoint = firstByte
              }
              break
            case 2:
              secondByte = buf[i + 1]
              if ((secondByte & 0xC0) === 0x80) {
                tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
                if (tempCodePoint > 0x7F) {
                  codePoint = tempCodePoint
                }
              }
              break
            case 3:
              secondByte = buf[i + 1]
              thirdByte = buf[i + 2]
              if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
                tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
                if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                  codePoint = tempCodePoint
                }
              }
              break
            case 4:
              secondByte = buf[i + 1]
              thirdByte = buf[i + 2]
              fourthByte = buf[i + 3]
              if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
                tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
                if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                  codePoint = tempCodePoint
                }
              }
          }
        }

        if (codePoint === null) {
          // we did not generate a valid codePoint so insert a
          // replacement char (U+FFFD) and advance only 1 byte
          codePoint = 0xFFFD
          bytesPerSequence = 1
        } else if (codePoint > 0xFFFF) {
          // encode to utf16 (surrogate pair dance)
          codePoint -= 0x10000
          res.push(codePoint >>> 10 & 0x3FF | 0xD800)
          codePoint = 0xDC00 | codePoint & 0x3FF
        }

        res.push(codePoint)
        i += bytesPerSequence
      }

      return decodeCodePointsArray(res)
    }

    // Based on http://stackoverflow.com/a/22747272/680742, the browser with
    // the lowest limit is Chrome, with 0x10000 args.
    // We go 1 magnitude less, for safety
    var MAX_ARGUMENTS_LENGTH = 0x1000

    function decodeCodePointsArray (codePoints) {
      var len = codePoints.length
      if (len <= MAX_ARGUMENTS_LENGTH) {
        return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
      }

      // Decode in chunks to avoid "call stack size exceeded".
      var res = ''
      var i = 0
      while (i < len) {
        res += String.fromCharCode.apply(
          String,
          codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
        )
      }
      return res
    }

    function asciiSlice (buf, start, end) {
      var ret = ''
      end = Math.min(buf.length, end)

      for (var i = start; i < end; i++) {
        ret += String.fromCharCode(buf[i] & 0x7F)
      }
      return ret
    }

    function binarySlice (buf, start, end) {
      var ret = ''
      end = Math.min(buf.length, end)

      for (var i = start; i < end; i++) {
        ret += String.fromCharCode(buf[i])
      }
      return ret
    }

    function hexSlice (buf, start, end) {
      var len = buf.length

      if (!start || start < 0) start = 0
      if (!end || end < 0 || end > len) end = len

      var out = ''
      for (var i = start; i < end; i++) {
        out += toHex(buf[i])
      }
      return out
    }

    function utf16leSlice (buf, start, end) {
      var bytes = buf.slice(start, end)
      var res = ''
      for (var i = 0; i < bytes.length; i += 2) {
        res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
      }
      return res
    }

    Buffer.prototype.slice = function slice (start, end) {
      var len = this.length
      start = ~~start
      end = end === undefined ? len : ~~end

      if (start < 0) {
        start += len
        if (start < 0) start = 0
      } else if (start > len) {
        start = len
      }

      if (end < 0) {
        end += len
        if (end < 0) end = 0
      } else if (end > len) {
        end = len
      }

      if (end < start) end = start

      var newBuf
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        newBuf = Buffer._augment(this.subarray(start, end))
      } else {
        var sliceLen = end - start
        newBuf = new Buffer(sliceLen, undefined)
        for (var i = 0; i < sliceLen; i++) {
          newBuf[i] = this[i + start]
        }
      }

      if (newBuf.length) newBuf.parent = this.parent || this

      return newBuf
    }

    /*
     * Need to make sure that buffer isn't trying to write out of bounds.
     */
    function checkOffset (offset, ext, length) {
      if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
      if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
    }

    Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
      offset = offset | 0
      byteLength = byteLength | 0
      if (!noAssert) checkOffset(offset, byteLength, this.length)

      var val = this[offset]
      var mul = 1
      var i = 0
      while (++i < byteLength && (mul *= 0x100)) {
        val += this[offset + i] * mul
      }

      return val
    }

    Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
      offset = offset | 0
      byteLength = byteLength | 0
      if (!noAssert) {
        checkOffset(offset, byteLength, this.length)
      }

      var val = this[offset + --byteLength]
      var mul = 1
      while (byteLength > 0 && (mul *= 0x100)) {
        val += this[offset + --byteLength] * mul
      }

      return val
    }

    Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 1, this.length)
      return this[offset]
    }

    Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 2, this.length)
      return this[offset] | (this[offset + 1] << 8)
    }

    Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 2, this.length)
      return (this[offset] << 8) | this[offset + 1]
    }

    Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 4, this.length)

      return ((this[offset]) |
          (this[offset + 1] << 8) |
          (this[offset + 2] << 16)) +
          (this[offset + 3] * 0x1000000)
    }

    Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 4, this.length)

      return (this[offset] * 0x1000000) +
        ((this[offset + 1] << 16) |
        (this[offset + 2] << 8) |
        this[offset + 3])
    }

    Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
      offset = offset | 0
      byteLength = byteLength | 0
      if (!noAssert) checkOffset(offset, byteLength, this.length)

      var val = this[offset]
      var mul = 1
      var i = 0
      while (++i < byteLength && (mul *= 0x100)) {
        val += this[offset + i] * mul
      }
      mul *= 0x80

      if (val >= mul) val -= Math.pow(2, 8 * byteLength)

      return val
    }

    Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
      offset = offset | 0
      byteLength = byteLength | 0
      if (!noAssert) checkOffset(offset, byteLength, this.length)

      var i = byteLength
      var mul = 1
      var val = this[offset + --i]
      while (i > 0 && (mul *= 0x100)) {
        val += this[offset + --i] * mul
      }
      mul *= 0x80

      if (val >= mul) val -= Math.pow(2, 8 * byteLength)

      return val
    }

    Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 1, this.length)
      if (!(this[offset] & 0x80)) return (this[offset])
      return ((0xff - this[offset] + 1) * -1)
    }

    Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 2, this.length)
      var val = this[offset] | (this[offset + 1] << 8)
      return (val & 0x8000) ? val | 0xFFFF0000 : val
    }

    Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 2, this.length)
      var val = this[offset + 1] | (this[offset] << 8)
      return (val & 0x8000) ? val | 0xFFFF0000 : val
    }

    Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 4, this.length)

      return (this[offset]) |
        (this[offset + 1] << 8) |
        (this[offset + 2] << 16) |
        (this[offset + 3] << 24)
    }

    Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 4, this.length)

      return (this[offset] << 24) |
        (this[offset + 1] << 16) |
        (this[offset + 2] << 8) |
        (this[offset + 3])
    }

    Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 4, this.length)
      return ieee754.read(this, offset, true, 23, 4)
    }

    Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 4, this.length)
      return ieee754.read(this, offset, false, 23, 4)
    }

    Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 8, this.length)
      return ieee754.read(this, offset, true, 52, 8)
    }

    Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
      if (!noAssert) checkOffset(offset, 8, this.length)
      return ieee754.read(this, offset, false, 52, 8)
    }

    function checkInt (buf, value, offset, ext, max, min) {
      if (!Buffer.isBuffer(buf)) throw new TypeError('buffer must be a Buffer instance')
      if (value > max || value < min) throw new RangeError('value is out of bounds')
      if (offset + ext > buf.length) throw new RangeError('index out of range')
    }

    Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
      value = +value
      offset = offset | 0
      byteLength = byteLength | 0
      if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)

      var mul = 1
      var i = 0
      this[offset] = value & 0xFF
      while (++i < byteLength && (mul *= 0x100)) {
        this[offset + i] = (value / mul) & 0xFF
      }

      return offset + byteLength
    }

    Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
      value = +value
      offset = offset | 0
      byteLength = byteLength | 0
      if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)

      var i = byteLength - 1
      var mul = 1
      this[offset + i] = value & 0xFF
      while (--i >= 0 && (mul *= 0x100)) {
        this[offset + i] = (value / mul) & 0xFF
      }

      return offset + byteLength
    }

    Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
      if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
      this[offset] = (value & 0xff)
      return offset + 1
    }

    function objectWriteUInt16 (buf, value, offset, littleEndian) {
      if (value < 0) value = 0xffff + value + 1
      for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
        buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
          (littleEndian ? i : 1 - i) * 8
      }
    }

    Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        this[offset] = (value & 0xff)
        this[offset + 1] = (value >>> 8)
      } else {
        objectWriteUInt16(this, value, offset, true)
      }
      return offset + 2
    }

    Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        this[offset] = (value >>> 8)
        this[offset + 1] = (value & 0xff)
      } else {
        objectWriteUInt16(this, value, offset, false)
      }
      return offset + 2
    }

    function objectWriteUInt32 (buf, value, offset, littleEndian) {
      if (value < 0) value = 0xffffffff + value + 1
      for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++) {
        buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
      }
    }

    Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        this[offset + 3] = (value >>> 24)
        this[offset + 2] = (value >>> 16)
        this[offset + 1] = (value >>> 8)
        this[offset] = (value & 0xff)
      } else {
        objectWriteUInt32(this, value, offset, true)
      }
      return offset + 4
    }

    Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        this[offset] = (value >>> 24)
        this[offset + 1] = (value >>> 16)
        this[offset + 2] = (value >>> 8)
        this[offset + 3] = (value & 0xff)
      } else {
        objectWriteUInt32(this, value, offset, false)
      }
      return offset + 4
    }

    Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) {
        var limit = Math.pow(2, 8 * byteLength - 1)

        checkInt(this, value, offset, byteLength, limit - 1, -limit)
      }

      var i = 0
      var mul = 1
      var sub = value < 0 ? 1 : 0
      this[offset] = value & 0xFF
      while (++i < byteLength && (mul *= 0x100)) {
        this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
      }

      return offset + byteLength
    }

    Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) {
        var limit = Math.pow(2, 8 * byteLength - 1)

        checkInt(this, value, offset, byteLength, limit - 1, -limit)
      }

      var i = byteLength - 1
      var mul = 1
      var sub = value < 0 ? 1 : 0
      this[offset + i] = value & 0xFF
      while (--i >= 0 && (mul *= 0x100)) {
        this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
      }

      return offset + byteLength
    }

    Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
      if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
      if (value < 0) value = 0xff + value + 1
      this[offset] = (value & 0xff)
      return offset + 1
    }

    Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        this[offset] = (value & 0xff)
        this[offset + 1] = (value >>> 8)
      } else {
        objectWriteUInt16(this, value, offset, true)
      }
      return offset + 2
    }

    Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        this[offset] = (value >>> 8)
        this[offset + 1] = (value & 0xff)
      } else {
        objectWriteUInt16(this, value, offset, false)
      }
      return offset + 2
    }

    Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        this[offset] = (value & 0xff)
        this[offset + 1] = (value >>> 8)
        this[offset + 2] = (value >>> 16)
        this[offset + 3] = (value >>> 24)
      } else {
        objectWriteUInt32(this, value, offset, true)
      }
      return offset + 4
    }

    Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
      value = +value
      offset = offset | 0
      if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
      if (value < 0) value = 0xffffffff + value + 1
      if (Buffer.TYPED_ARRAY_SUPPORT) {
        this[offset] = (value >>> 24)
        this[offset + 1] = (value >>> 16)
        this[offset + 2] = (value >>> 8)
        this[offset + 3] = (value & 0xff)
      } else {
        objectWriteUInt32(this, value, offset, false)
      }
      return offset + 4
    }

    function checkIEEE754 (buf, value, offset, ext, max, min) {
      if (value > max || value < min) throw new RangeError('value is out of bounds')
      if (offset + ext > buf.length) throw new RangeError('index out of range')
      if (offset < 0) throw new RangeError('index out of range')
    }

    function writeFloat (buf, value, offset, littleEndian, noAssert) {
      if (!noAssert) {
        checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
      }
      ieee754.write(buf, value, offset, littleEndian, 23, 4)
      return offset + 4
    }

    Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
      return writeFloat(this, value, offset, true, noAssert)
    }

    Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
      return writeFloat(this, value, offset, false, noAssert)
    }

    function writeDouble (buf, value, offset, littleEndian, noAssert) {
      if (!noAssert) {
        checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
      }
      ieee754.write(buf, value, offset, littleEndian, 52, 8)
      return offset + 8
    }

    Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
      return writeDouble(this, value, offset, true, noAssert)
    }

    Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
      return writeDouble(this, value, offset, false, noAssert)
    }

    // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
    Buffer.prototype.copy = function copy (target, targetStart, start, end) {
      if (!start) start = 0
      if (!end && end !== 0) end = this.length
      if (targetStart >= target.length) targetStart = target.length
      if (!targetStart) targetStart = 0
      if (end > 0 && end < start) end = start

      // Copy 0 bytes; we're done
      if (end === start) return 0
      if (target.length === 0 || this.length === 0) return 0

      // Fatal error conditions
      if (targetStart < 0) {
        throw new RangeError('targetStart out of bounds')
      }
      if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
      if (end < 0) throw new RangeError('sourceEnd out of bounds')

      // Are we oob?
      if (end > this.length) end = this.length
      if (target.length - targetStart < end - start) {
        end = target.length - targetStart + start
      }

      var len = end - start
      var i

      if (this === target && start < targetStart && targetStart < end) {
        // descending copy from end
        for (i = len - 1; i >= 0; i--) {
          target[i + targetStart] = this[i + start]
        }
      } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
        // ascending copy from start
        for (i = 0; i < len; i++) {
          target[i + targetStart] = this[i + start]
        }
      } else {
        target._set(this.subarray(start, start + len), targetStart)
      }

      return len
    }

    // fill(value, start=0, end=buffer.length)
    Buffer.prototype.fill = function fill (value, start, end) {
      if (!value) value = 0
      if (!start) start = 0
      if (!end) end = this.length

      if (end < start) throw new RangeError('end < start')

      // Fill 0 bytes; we're done
      if (end === start) return
      if (this.length === 0) return

      if (start < 0 || start >= this.length) throw new RangeError('start out of bounds')
      if (end < 0 || end > this.length) throw new RangeError('end out of bounds')

      var i
      if (typeof value === 'number') {
        for (i = start; i < end; i++) {
          this[i] = value
        }
      } else {
        var bytes = utf8ToBytes(value.toString())
        var len = bytes.length
        for (i = start; i < end; i++) {
          this[i] = bytes[i % len]
        }
      }

      return this
    }

    /**
     * Creates a new `ArrayBuffer` with the *copied* memory of the buffer instance.
     * Added in Node 0.12. Only available in browsers that support ArrayBuffer.
     */
    Buffer.prototype.toArrayBuffer = function toArrayBuffer () {
      if (typeof Uint8Array !== 'undefined') {
        if (Buffer.TYPED_ARRAY_SUPPORT) {
          return (new Buffer(this)).buffer
        } else {
          var buf = new Uint8Array(this.length)
          for (var i = 0, len = buf.length; i < len; i += 1) {
            buf[i] = this[i]
          }
          return buf.buffer
        }
      } else {
        throw new TypeError('Buffer.toArrayBuffer not supported in this browser')
      }
    }

    // HELPER FUNCTIONS
    // ================

    var BP = Buffer.prototype

    /**
     * Augment a Uint8Array *instance* (not the Uint8Array class!) with Buffer methods
     */
    Buffer._augment = function _augment (arr) {
      arr.constructor = Buffer
      arr._isBuffer = true

      // save reference to original Uint8Array set method before overwriting
      arr._set = arr.set

      // deprecated
      arr.get = BP.get
      arr.set = BP.set

      arr.write = BP.write
      arr.toString = BP.toString
      arr.toLocaleString = BP.toString
      arr.toJSON = BP.toJSON
      arr.equals = BP.equals
      arr.compare = BP.compare
      arr.indexOf = BP.indexOf
      arr.copy = BP.copy
      arr.slice = BP.slice
      arr.readUIntLE = BP.readUIntLE
      arr.readUIntBE = BP.readUIntBE
      arr.readUInt8 = BP.readUInt8
      arr.readUInt16LE = BP.readUInt16LE
      arr.readUInt16BE = BP.readUInt16BE
      arr.readUInt32LE = BP.readUInt32LE
      arr.readUInt32BE = BP.readUInt32BE
      arr.readIntLE = BP.readIntLE
      arr.readIntBE = BP.readIntBE
      arr.readInt8 = BP.readInt8
      arr.readInt16LE = BP.readInt16LE
      arr.readInt16BE = BP.readInt16BE
      arr.readInt32LE = BP.readInt32LE
      arr.readInt32BE = BP.readInt32BE
      arr.readFloatLE = BP.readFloatLE
      arr.readFloatBE = BP.readFloatBE
      arr.readDoubleLE = BP.readDoubleLE
      arr.readDoubleBE = BP.readDoubleBE
      arr.writeUInt8 = BP.writeUInt8
      arr.writeUIntLE = BP.writeUIntLE
      arr.writeUIntBE = BP.writeUIntBE
      arr.writeUInt16LE = BP.writeUInt16LE
      arr.writeUInt16BE = BP.writeUInt16BE
      arr.writeUInt32LE = BP.writeUInt32LE
      arr.writeUInt32BE = BP.writeUInt32BE
      arr.writeIntLE = BP.writeIntLE
      arr.writeIntBE = BP.writeIntBE
      arr.writeInt8 = BP.writeInt8
      arr.writeInt16LE = BP.writeInt16LE
      arr.writeInt16BE = BP.writeInt16BE
      arr.writeInt32LE = BP.writeInt32LE
      arr.writeInt32BE = BP.writeInt32BE
      arr.writeFloatLE = BP.writeFloatLE
      arr.writeFloatBE = BP.writeFloatBE
      arr.writeDoubleLE = BP.writeDoubleLE
      arr.writeDoubleBE = BP.writeDoubleBE
      arr.fill = BP.fill
      arr.inspect = BP.inspect
      arr.toArrayBuffer = BP.toArrayBuffer

      return arr
    }

    var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g

    function base64clean (str) {
      // Node strips out invalid characters like \n and \t from the string, base64-js does not
      str = stringtrim(str).replace(INVALID_BASE64_RE, '')
      // Node converts strings with length < 2 to ''
      if (str.length < 2) return ''
      // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
      while (str.length % 4 !== 0) {
        str = str + '='
      }
      return str
    }

    function stringtrim (str) {
      if (str.trim) return str.trim()
      return str.replace(/^\s+|\s+$/g, '')
    }

    function toHex (n) {
      if (n < 16) return '0' + n.toString(16)
      return n.toString(16)
    }

    function utf8ToBytes (string, units) {
      units = units || Infinity
      var codePoint
      var length = string.length
      var leadSurrogate = null
      var bytes = []

      for (var i = 0; i < length; i++) {
        codePoint = string.charCodeAt(i)

        // is surrogate component
        if (codePoint > 0xD7FF && codePoint < 0xE000) {
          // last char was a lead
          if (!leadSurrogate) {
            // no lead yet
            if (codePoint > 0xDBFF) {
              // unexpected trail
              if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
              continue
            } else if (i + 1 === length) {
              // unpaired lead
              if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
              continue
            }

            // valid lead
            leadSurrogate = codePoint

            continue
          }

          // 2 leads in a row
          if (codePoint < 0xDC00) {
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            leadSurrogate = codePoint
            continue
          }

          // valid surrogate pair
          codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
        } else if (leadSurrogate) {
          // valid bmp char, but last char was a lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        }

        leadSurrogate = null

        // encode utf8
        if (codePoint < 0x80) {
          if ((units -= 1) < 0) break
          bytes.push(codePoint)
        } else if (codePoint < 0x800) {
          if ((units -= 2) < 0) break
          bytes.push(
            codePoint >> 0x6 | 0xC0,
            codePoint & 0x3F | 0x80
          )
        } else if (codePoint < 0x10000) {
          if ((units -= 3) < 0) break
          bytes.push(
            codePoint >> 0xC | 0xE0,
            codePoint >> 0x6 & 0x3F | 0x80,
            codePoint & 0x3F | 0x80
          )
        } else if (codePoint < 0x110000) {
          if ((units -= 4) < 0) break
          bytes.push(
            codePoint >> 0x12 | 0xF0,
            codePoint >> 0xC & 0x3F | 0x80,
            codePoint >> 0x6 & 0x3F | 0x80,
            codePoint & 0x3F | 0x80
          )
        } else {
          throw new Error('Invalid code point')
        }
      }

      return bytes
    }

    function asciiToBytes (str) {
      var byteArray = []
      for (var i = 0; i < str.length; i++) {
        // Node's code seems to be doing this and not & 0x7F..
        byteArray.push(str.charCodeAt(i) & 0xFF)
      }
      return byteArray
    }

    function utf16leToBytes (str, units) {
      var c, hi, lo
      var byteArray = []
      for (var i = 0; i < str.length; i++) {
        if ((units -= 2) < 0) break

        c = str.charCodeAt(i)
        hi = c >> 8
        lo = c % 256
        byteArray.push(lo)
        byteArray.push(hi)
      }

      return byteArray
    }

    function base64ToBytes (str) {
      return base64.toByteArray(base64clean(str))
    }

    function blitBuffer (src, dst, offset, length) {
      for (var i = 0; i < length; i++) {
        if ((i + offset >= dst.length) || (i >= src.length)) break
        dst[i + offset] = src[i]
      }
      return i
    }

    }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{"base64-js":34,"ieee754":35,"isarray":36}],34:[function(require,module,exports){
    var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

    ;(function (exports) {
    	'use strict';

      var Arr = (typeof Uint8Array !== 'undefined')
        ? Uint8Array
        : Array

    	var PLUS   = '+'.charCodeAt(0)
    	var SLASH  = '/'.charCodeAt(0)
    	var NUMBER = '0'.charCodeAt(0)
    	var LOWER  = 'a'.charCodeAt(0)
    	var UPPER  = 'A'.charCodeAt(0)
    	var PLUS_URL_SAFE = '-'.charCodeAt(0)
    	var SLASH_URL_SAFE = '_'.charCodeAt(0)

    	function decode (elt) {
    		var code = elt.charCodeAt(0)
    		if (code === PLUS ||
    		    code === PLUS_URL_SAFE)
    			return 62 // '+'
    		if (code === SLASH ||
    		    code === SLASH_URL_SAFE)
    			return 63 // '/'
    		if (code < NUMBER)
    			return -1 //no match
    		if (code < NUMBER + 10)
    			return code - NUMBER + 26 + 26
    		if (code < UPPER + 26)
    			return code - UPPER
    		if (code < LOWER + 26)
    			return code - LOWER + 26
    	}

    	function b64ToByteArray (b64) {
    		var i, j, l, tmp, placeHolders, arr

    		if (b64.length % 4 > 0) {
    			throw new Error('Invalid string. Length must be a multiple of 4')
    		}

    		// the number of equal signs (place holders)
    		// if there are two placeholders, than the two characters before it
    		// represent one byte
    		// if there is only one, then the three characters before it represent 2 bytes
    		// this is just a cheap hack to not do indexOf twice
    		var len = b64.length
    		placeHolders = '=' === b64.charAt(len - 2) ? 2 : '=' === b64.charAt(len - 1) ? 1 : 0

    		// base64 is 4/3 + up to two characters of the original data
    		arr = new Arr(b64.length * 3 / 4 - placeHolders)

    		// if there are placeholders, only get up to the last complete 4 chars
    		l = placeHolders > 0 ? b64.length - 4 : b64.length

    		var L = 0

    		function push (v) {
    			arr[L++] = v
    		}

    		for (i = 0, j = 0; i < l; i += 4, j += 3) {
    			tmp = (decode(b64.charAt(i)) << 18) | (decode(b64.charAt(i + 1)) << 12) | (decode(b64.charAt(i + 2)) << 6) | decode(b64.charAt(i + 3))
    			push((tmp & 0xFF0000) >> 16)
    			push((tmp & 0xFF00) >> 8)
    			push(tmp & 0xFF)
    		}

    		if (placeHolders === 2) {
    			tmp = (decode(b64.charAt(i)) << 2) | (decode(b64.charAt(i + 1)) >> 4)
    			push(tmp & 0xFF)
    		} else if (placeHolders === 1) {
    			tmp = (decode(b64.charAt(i)) << 10) | (decode(b64.charAt(i + 1)) << 4) | (decode(b64.charAt(i + 2)) >> 2)
    			push((tmp >> 8) & 0xFF)
    			push(tmp & 0xFF)
    		}

    		return arr
    	}

    	function uint8ToBase64 (uint8) {
    		var i,
    			extraBytes = uint8.length % 3, // if we have 1 byte left, pad 2 bytes
    			output = "",
    			temp, length

    		function encode (num) {
    			return lookup.charAt(num)
    		}

    		function tripletToBase64 (num) {
    			return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
    		}

    		// go through the array every three bytes, we'll deal with trailing stuff later
    		for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
    			temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
    			output += tripletToBase64(temp)
    		}

    		// pad the end with zeros, but make sure to not forget the extra bytes
    		switch (extraBytes) {
    			case 1:
    				temp = uint8[uint8.length - 1]
    				output += encode(temp >> 2)
    				output += encode((temp << 4) & 0x3F)
    				output += '=='
    				break
    			case 2:
    				temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
    				output += encode(temp >> 10)
    				output += encode((temp >> 4) & 0x3F)
    				output += encode((temp << 2) & 0x3F)
    				output += '='
    				break
    		}

    		return output
    	}

    	exports.toByteArray = b64ToByteArray
    	exports.fromByteArray = uint8ToBase64
    }(typeof exports === 'undefined' ? (this.base64js = {}) : exports))

    },{}],35:[function(require,module,exports){
    exports.read = function (buffer, offset, isLE, mLen, nBytes) {
      var e, m
      var eLen = nBytes * 8 - mLen - 1
      var eMax = (1 << eLen) - 1
      var eBias = eMax >> 1
      var nBits = -7
      var i = isLE ? (nBytes - 1) : 0
      var d = isLE ? -1 : 1
      var s = buffer[offset + i]

      i += d

      e = s & ((1 << (-nBits)) - 1)
      s >>= (-nBits)
      nBits += eLen
      for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}

      m = e & ((1 << (-nBits)) - 1)
      e >>= (-nBits)
      nBits += mLen
      for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}

      if (e === 0) {
        e = 1 - eBias
      } else if (e === eMax) {
        return m ? NaN : ((s ? -1 : 1) * Infinity)
      } else {
        m = m + Math.pow(2, mLen)
        e = e - eBias
      }
      return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
    }

    exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
      var e, m, c
      var eLen = nBytes * 8 - mLen - 1
      var eMax = (1 << eLen) - 1
      var eBias = eMax >> 1
      var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
      var i = isLE ? 0 : (nBytes - 1)
      var d = isLE ? 1 : -1
      var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

      value = Math.abs(value)

      if (isNaN(value) || value === Infinity) {
        m = isNaN(value) ? 1 : 0
        e = eMax
      } else {
        e = Math.floor(Math.log(value) / Math.LN2)
        if (value * (c = Math.pow(2, -e)) < 1) {
          e--
          c *= 2
        }
        if (e + eBias >= 1) {
          value += rt / c
        } else {
          value += rt * Math.pow(2, 1 - eBias)
        }
        if (value * c >= 2) {
          e++
          c /= 2
        }

        if (e + eBias >= eMax) {
          m = 0
          e = eMax
        } else if (e + eBias >= 1) {
          m = (value * c - 1) * Math.pow(2, mLen)
          e = e + eBias
        } else {
          m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
          e = 0
        }
      }

      for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

      e = (e << mLen) | m
      eLen += mLen
      for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

      buffer[offset + i - d] |= s * 128
    }

    },{}],36:[function(require,module,exports){
    var toString = {}.toString;

    module.exports = Array.isArray || function (arr) {
      return toString.call(arr) == '[object Array]';
    };

    },{}],37:[function(require,module,exports){
    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    function EventEmitter() {
      this._events = this._events || {};
      this._maxListeners = this._maxListeners || undefined;
    }
    module.exports = EventEmitter;

    // Backwards-compat with node 0.10.x
    EventEmitter.EventEmitter = EventEmitter;

    EventEmitter.prototype._events = undefined;
    EventEmitter.prototype._maxListeners = undefined;

    // By default EventEmitters will print a warning if more than 10 listeners are
    // added to it. This is a useful default which helps finding memory leaks.
    EventEmitter.defaultMaxListeners = 10;

    // Obviously not all Emitters should be limited to 10. This function allows
    // that to be increased. Set to zero for unlimited.
    EventEmitter.prototype.setMaxListeners = function(n) {
      if (!isNumber(n) || n < 0 || isNaN(n))
        throw TypeError('n must be a positive number');
      this._maxListeners = n;
      return this;
    };

    EventEmitter.prototype.emit = function(type) {
      var er, handler, len, args, i, listeners;

      if (!this._events)
        this._events = {};

      // If there is no 'error' event listener then throw.
      if (type === 'error') {
        if (!this._events.error ||
            (isObject(this._events.error) && !this._events.error.length)) {
          er = arguments[1];
          if (er instanceof Error) {
            throw er; // Unhandled 'error' event
          }
          throw TypeError('Uncaught, unspecified "error" event.');
        }
      }

      handler = this._events[type];

      if (isUndefined(handler))
        return false;

      if (isFunction(handler)) {
        switch (arguments.length) {
          // fast cases
          case 1:
            handler.call(this);
            break;
          case 2:
            handler.call(this, arguments[1]);
            break;
          case 3:
            handler.call(this, arguments[1], arguments[2]);
            break;
          // slower
          default:
            len = arguments.length;
            args = new Array(len - 1);
            for (i = 1; i < len; i++)
              args[i - 1] = arguments[i];
            handler.apply(this, args);
        }
      } else if (isObject(handler)) {
        len = arguments.length;
        args = new Array(len - 1);
        for (i = 1; i < len; i++)
          args[i - 1] = arguments[i];

        listeners = handler.slice();
        len = listeners.length;
        for (i = 0; i < len; i++)
          listeners[i].apply(this, args);
      }

      return true;
    };

    EventEmitter.prototype.addListener = function(type, listener) {
      var m;

      if (!isFunction(listener))
        throw TypeError('listener must be a function');

      if (!this._events)
        this._events = {};

      // To avoid recursion in the case that type === "newListener"! Before
      // adding it to the listeners, first emit "newListener".
      if (this._events.newListener)
        this.emit('newListener', type,
                  isFunction(listener.listener) ?
                  listener.listener : listener);

      if (!this._events[type])
        // Optimize the case of one listener. Don't need the extra array object.
        this._events[type] = listener;
      else if (isObject(this._events[type]))
        // If we've already got an array, just append.
        this._events[type].push(listener);
      else
        // Adding the second element, need to change to array.
        this._events[type] = [this._events[type], listener];

      // Check for listener leak
      if (isObject(this._events[type]) && !this._events[type].warned) {
        var m;
        if (!isUndefined(this._maxListeners)) {
          m = this._maxListeners;
        } else {
          m = EventEmitter.defaultMaxListeners;
        }

        if (m && m > 0 && this._events[type].length > m) {
          this._events[type].warned = true;
          console.error('(node) warning: possible EventEmitter memory ' +
                        'leak detected. %d listeners added. ' +
                        'Use emitter.setMaxListeners() to increase limit.',
                        this._events[type].length);
          if (typeof console.trace === 'function') {
            // not supported in IE 10
            console.trace();
          }
        }
      }

      return this;
    };

    EventEmitter.prototype.on = EventEmitter.prototype.addListener;

    EventEmitter.prototype.once = function(type, listener) {
      if (!isFunction(listener))
        throw TypeError('listener must be a function');

      var fired = false;

      function g() {
        this.removeListener(type, g);

        if (!fired) {
          fired = true;
          listener.apply(this, arguments);
        }
      }

      g.listener = listener;
      this.on(type, g);

      return this;
    };

    // emits a 'removeListener' event iff the listener was removed
    EventEmitter.prototype.removeListener = function(type, listener) {
      var list, position, length, i;

      if (!isFunction(listener))
        throw TypeError('listener must be a function');

      if (!this._events || !this._events[type])
        return this;

      list = this._events[type];
      length = list.length;
      position = -1;

      if (list === listener ||
          (isFunction(list.listener) && list.listener === listener)) {
        delete this._events[type];
        if (this._events.removeListener)
          this.emit('removeListener', type, listener);

      } else if (isObject(list)) {
        for (i = length; i-- > 0;) {
          if (list[i] === listener ||
              (list[i].listener && list[i].listener === listener)) {
            position = i;
            break;
          }
        }

        if (position < 0)
          return this;

        if (list.length === 1) {
          list.length = 0;
          delete this._events[type];
        } else {
          list.splice(position, 1);
        }

        if (this._events.removeListener)
          this.emit('removeListener', type, listener);
      }

      return this;
    };

    EventEmitter.prototype.removeAllListeners = function(type) {
      var key, listeners;

      if (!this._events)
        return this;

      // not listening for removeListener, no need to emit
      if (!this._events.removeListener) {
        if (arguments.length === 0)
          this._events = {};
        else if (this._events[type])
          delete this._events[type];
        return this;
      }

      // emit removeListener for all listeners on all events
      if (arguments.length === 0) {
        for (key in this._events) {
          if (key === 'removeListener') continue;
          this.removeAllListeners(key);
        }
        this.removeAllListeners('removeListener');
        this._events = {};
        return this;
      }

      listeners = this._events[type];

      if (isFunction(listeners)) {
        this.removeListener(type, listeners);
      } else {
        // LIFO order
        while (listeners.length)
          this.removeListener(type, listeners[listeners.length - 1]);
      }
      delete this._events[type];

      return this;
    };

    EventEmitter.prototype.listeners = function(type) {
      var ret;
      if (!this._events || !this._events[type])
        ret = [];
      else if (isFunction(this._events[type]))
        ret = [this._events[type]];
      else
        ret = this._events[type].slice();
      return ret;
    };

    EventEmitter.listenerCount = function(emitter, type) {
      var ret;
      if (!emitter._events || !emitter._events[type])
        ret = 0;
      else if (isFunction(emitter._events[type]))
        ret = 1;
      else
        ret = emitter._events[type].length;
      return ret;
    };

    function isFunction(arg) {
      return typeof arg === 'function';
    }

    function isNumber(arg) {
      return typeof arg === 'number';
    }

    function isObject(arg) {
      return typeof arg === 'object' && arg !== null;
    }

    function isUndefined(arg) {
      return arg === void 0;
    }

    },{}],38:[function(require,module,exports){
    if (typeof Object.create === 'function') {
      // implementation from standard node.js 'util' module
      module.exports = function inherits(ctor, superCtor) {
        ctor.super_ = superCtor
        ctor.prototype = Object.create(superCtor.prototype, {
          constructor: {
            value: ctor,
            enumerable: false,
            writable: true,
            configurable: true
          }
        });
      };
    } else {
      // old school shim for old browsers
      module.exports = function inherits(ctor, superCtor) {
        ctor.super_ = superCtor
        var TempCtor = function () {}
        TempCtor.prototype = superCtor.prototype
        ctor.prototype = new TempCtor()
        ctor.prototype.constructor = ctor
      }
    }

    },{}],39:[function(require,module,exports){
    /**
     * Determine if an object is Buffer
     *
     * Author:   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
     * License:  MIT
     *
     * `npm install is-buffer`
     */

    module.exports = function (obj) {
      return !!(obj != null &&
        (obj._isBuffer || // For Safari 5-7 (missing Object.prototype.constructor)
          (obj.constructor &&
          typeof obj.constructor.isBuffer === 'function' &&
          obj.constructor.isBuffer(obj))
        ))
    }

    },{}],40:[function(require,module,exports){
    module.exports = Array.isArray || function (arr) {
      return Object.prototype.toString.call(arr) == '[object Array]';
    };

    },{}],41:[function(require,module,exports){
    exports.endianness = function () { return 'LE' };

    exports.hostname = function () {
        if (typeof location !== 'undefined') {
            return location.hostname
        }
        else return '';
    };

    exports.loadavg = function () { return [] };

    exports.uptime = function () { return 0 };

    exports.freemem = function () {
        return Number.MAX_VALUE;
    };

    exports.totalmem = function () {
        return Number.MAX_VALUE;
    };

    exports.cpus = function () { return [] };

    exports.type = function () { return 'Browser' };

    exports.release = function () {
        if (typeof navigator !== 'undefined') {
            return navigator.appVersion;
        }
        return '';
    };

    exports.networkInterfaces
    = exports.getNetworkInterfaces
    = function () { return {} };

    exports.arch = function () { return 'javascript' };

    exports.platform = function () { return 'browser' };

    exports.tmpdir = exports.tmpDir = function () {
        return '/tmp';
    };

    exports.EOL = '\n';

    },{}],42:[function(require,module,exports){
    // shim for using process in browser

    var process = module.exports = {};
    var queue = [];
    var draining = false;
    var currentQueue;
    var queueIndex = -1;

    function cleanUpNextTick() {
        draining = false;
        if (currentQueue.length) {
            queue = currentQueue.concat(queue);
        } else {
            queueIndex = -1;
        }
        if (queue.length) {
            drainQueue();
        }
    }

    function drainQueue() {
        if (draining) {
            return;
        }
        var timeout = setTimeout(cleanUpNextTick);
        draining = true;

        var len = queue.length;
        while(len) {
            currentQueue = queue;
            queue = [];
            while (++queueIndex < len) {
                if (currentQueue) {
                    currentQueue[queueIndex].run();
                }
            }
            queueIndex = -1;
            len = queue.length;
        }
        currentQueue = null;
        draining = false;
        clearTimeout(timeout);
    }

    process.nextTick = function (fun) {
        var args = new Array(arguments.length - 1);
        if (arguments.length > 1) {
            for (var i = 1; i < arguments.length; i++) {
                args[i - 1] = arguments[i];
            }
        }
        queue.push(new Item(fun, args));
        if (queue.length === 1 && !draining) {
            setTimeout(drainQueue, 0);
        }
    };

    // v8 likes predictible objects
    function Item(fun, array) {
        this.fun = fun;
        this.array = array;
    }
    Item.prototype.run = function () {
        this.fun.apply(null, this.array);
    };
    process.title = 'browser';
    process.browser = true;
    process.env = {};
    process.argv = [];
    process.version = ''; // empty string to avoid regexp issues
    process.versions = {};

    function noop() {}

    process.on = noop;
    process.addListener = noop;
    process.once = noop;
    process.off = noop;
    process.removeListener = noop;
    process.removeAllListeners = noop;
    process.emit = noop;

    process.binding = function (name) {
        throw new Error('process.binding is not supported');
    };

    process.cwd = function () { return '/' };
    process.chdir = function (dir) {
        throw new Error('process.chdir is not supported');
    };
    process.umask = function() { return 0; };

    },{}],43:[function(require,module,exports){
    (function (global){
    /*! https://mths.be/punycode v1.4.0 by @mathias */
    ;(function(root) {

    	/** Detect free variables */
    	var freeExports = typeof exports == 'object' && exports &&
    		!exports.nodeType && exports;
    	var freeModule = typeof module == 'object' && module &&
    		!module.nodeType && module;
    	var freeGlobal = typeof global == 'object' && global;
    	if (
    		freeGlobal.global === freeGlobal ||
    		freeGlobal.window === freeGlobal ||
    		freeGlobal.self === freeGlobal
    	) {
    		root = freeGlobal;
    	}

    	/**
    	 * The `punycode` object.
    	 * @name punycode
    	 * @type Object
    	 */
    	var punycode,

    	/** Highest positive signed 32-bit float value */
    	maxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1

    	/** Bootstring parameters */
    	base = 36,
    	tMin = 1,
    	tMax = 26,
    	skew = 38,
    	damp = 700,
    	initialBias = 72,
    	initialN = 128, // 0x80
    	delimiter = '-', // '\x2D'

    	/** Regular expressions */
    	regexPunycode = /^xn--/,
    	regexNonASCII = /[^\x20-\x7E]/, // unprintable ASCII chars + non-ASCII chars
    	regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g, // RFC 3490 separators

    	/** Error messages */
    	errors = {
    		'overflow': 'Overflow: input needs wider integers to process',
    		'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
    		'invalid-input': 'Invalid input'
    	},

    	/** Convenience shortcuts */
    	baseMinusTMin = base - tMin,
    	floor = Math.floor,
    	stringFromCharCode = String.fromCharCode,

    	/** Temporary variable */
    	key;

    	/*--------------------------------------------------------------------------*/

    	/**
    	 * A generic error utility function.
    	 * @private
    	 * @param {String} type The error type.
    	 * @returns {Error} Throws a `RangeError` with the applicable error message.
    	 */
    	function error(type) {
    		throw new RangeError(errors[type]);
    	}

    	/**
    	 * A generic `Array#map` utility function.
    	 * @private
    	 * @param {Array} array The array to iterate over.
    	 * @param {Function} callback The function that gets called for every array
    	 * item.
    	 * @returns {Array} A new array of values returned by the callback function.
    	 */
    	function map(array, fn) {
    		var length = array.length;
    		var result = [];
    		while (length--) {
    			result[length] = fn(array[length]);
    		}
    		return result;
    	}

    	/**
    	 * A simple `Array#map`-like wrapper to work with domain name strings or email
    	 * addresses.
    	 * @private
    	 * @param {String} domain The domain name or email address.
    	 * @param {Function} callback The function that gets called for every
    	 * character.
    	 * @returns {Array} A new string of characters returned by the callback
    	 * function.
    	 */
    	function mapDomain(string, fn) {
    		var parts = string.split('@');
    		var result = '';
    		if (parts.length > 1) {
    			// In email addresses, only the domain name should be punycoded. Leave
    			// the local part (i.e. everything up to `@`) intact.
    			result = parts[0] + '@';
    			string = parts[1];
    		}
    		// Avoid `split(regex)` for IE8 compatibility. See #17.
    		string = string.replace(regexSeparators, '\x2E');
    		var labels = string.split('.');
    		var encoded = map(labels, fn).join('.');
    		return result + encoded;
    	}

    	/**
    	 * Creates an array containing the numeric code points of each Unicode
    	 * character in the string. While JavaScript uses UCS-2 internally,
    	 * this function will convert a pair of surrogate halves (each of which
    	 * UCS-2 exposes as separate characters) into a single code point,
    	 * matching UTF-16.
    	 * @see `punycode.ucs2.encode`
    	 * @see <https://mathiasbynens.be/notes/javascript-encoding>
    	 * @memberOf punycode.ucs2
    	 * @name decode
    	 * @param {String} string The Unicode input string (UCS-2).
    	 * @returns {Array} The new array of code points.
    	 */
    	function ucs2decode(string) {
    		var output = [],
    		    counter = 0,
    		    length = string.length,
    		    value,
    		    extra;
    		while (counter < length) {
    			value = string.charCodeAt(counter++);
    			if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
    				// high surrogate, and there is a next character
    				extra = string.charCodeAt(counter++);
    				if ((extra & 0xFC00) == 0xDC00) { // low surrogate
    					output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
    				} else {
    					// unmatched surrogate; only append this code unit, in case the next
    					// code unit is the high surrogate of a surrogate pair
    					output.push(value);
    					counter--;
    				}
    			} else {
    				output.push(value);
    			}
    		}
    		return output;
    	}

    	/**
    	 * Creates a string based on an array of numeric code points.
    	 * @see `punycode.ucs2.decode`
    	 * @memberOf punycode.ucs2
    	 * @name encode
    	 * @param {Array} codePoints The array of numeric code points.
    	 * @returns {String} The new Unicode string (UCS-2).
    	 */
    	function ucs2encode(array) {
    		return map(array, function(value) {
    			var output = '';
    			if (value > 0xFFFF) {
    				value -= 0x10000;
    				output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
    				value = 0xDC00 | value & 0x3FF;
    			}
    			output += stringFromCharCode(value);
    			return output;
    		}).join('');
    	}

    	/**
    	 * Converts a basic code point into a digit/integer.
    	 * @see `digitToBasic()`
    	 * @private
    	 * @param {Number} codePoint The basic numeric code point value.
    	 * @returns {Number} The numeric value of a basic code point (for use in
    	 * representing integers) in the range `0` to `base - 1`, or `base` if
    	 * the code point does not represent a value.
    	 */
    	function basicToDigit(codePoint) {
    		if (codePoint - 48 < 10) {
    			return codePoint - 22;
    		}
    		if (codePoint - 65 < 26) {
    			return codePoint - 65;
    		}
    		if (codePoint - 97 < 26) {
    			return codePoint - 97;
    		}
    		return base;
    	}

    	/**
    	 * Converts a digit/integer into a basic code point.
    	 * @see `basicToDigit()`
    	 * @private
    	 * @param {Number} digit The numeric value of a basic code point.
    	 * @returns {Number} The basic code point whose value (when used for
    	 * representing integers) is `digit`, which needs to be in the range
    	 * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
    	 * used; else, the lowercase form is used. The behavior is undefined
    	 * if `flag` is non-zero and `digit` has no uppercase form.
    	 */
    	function digitToBasic(digit, flag) {
    		//  0..25 map to ASCII a..z or A..Z
    		// 26..35 map to ASCII 0..9
    		return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
    	}

    	/**
    	 * Bias adaptation function as per section 3.4 of RFC 3492.
    	 * https://tools.ietf.org/html/rfc3492#section-3.4
    	 * @private
    	 */
    	function adapt(delta, numPoints, firstTime) {
    		var k = 0;
    		delta = firstTime ? floor(delta / damp) : delta >> 1;
    		delta += floor(delta / numPoints);
    		for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
    			delta = floor(delta / baseMinusTMin);
    		}
    		return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
    	}

    	/**
    	 * Converts a Punycode string of ASCII-only symbols to a string of Unicode
    	 * symbols.
    	 * @memberOf punycode
    	 * @param {String} input The Punycode string of ASCII-only symbols.
    	 * @returns {String} The resulting string of Unicode symbols.
    	 */
    	function decode(input) {
    		// Don't use UCS-2
    		var output = [],
    		    inputLength = input.length,
    		    out,
    		    i = 0,
    		    n = initialN,
    		    bias = initialBias,
    		    basic,
    		    j,
    		    index,
    		    oldi,
    		    w,
    		    k,
    		    digit,
    		    t,
    		    /** Cached calculation results */
    		    baseMinusT;

    		// Handle the basic code points: let `basic` be the number of input code
    		// points before the last delimiter, or `0` if there is none, then copy
    		// the first basic code points to the output.

    		basic = input.lastIndexOf(delimiter);
    		if (basic < 0) {
    			basic = 0;
    		}

    		for (j = 0; j < basic; ++j) {
    			// if it's not a basic code point
    			if (input.charCodeAt(j) >= 0x80) {
    				error('not-basic');
    			}
    			output.push(input.charCodeAt(j));
    		}

    		// Main decoding loop: start just after the last delimiter if any basic code
    		// points were copied; start at the beginning otherwise.

    		for (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {

    			// `index` is the index of the next character to be consumed.
    			// Decode a generalized variable-length integer into `delta`,
    			// which gets added to `i`. The overflow checking is easier
    			// if we increase `i` as we go, then subtract off its starting
    			// value at the end to obtain `delta`.
    			for (oldi = i, w = 1, k = base; /* no condition */; k += base) {

    				if (index >= inputLength) {
    					error('invalid-input');
    				}

    				digit = basicToDigit(input.charCodeAt(index++));

    				if (digit >= base || digit > floor((maxInt - i) / w)) {
    					error('overflow');
    				}

    				i += digit * w;
    				t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);

    				if (digit < t) {
    					break;
    				}

    				baseMinusT = base - t;
    				if (w > floor(maxInt / baseMinusT)) {
    					error('overflow');
    				}

    				w *= baseMinusT;

    			}

    			out = output.length + 1;
    			bias = adapt(i - oldi, out, oldi == 0);

    			// `i` was supposed to wrap around from `out` to `0`,
    			// incrementing `n` each time, so we'll fix that now:
    			if (floor(i / out) > maxInt - n) {
    				error('overflow');
    			}

    			n += floor(i / out);
    			i %= out;

    			// Insert `n` at position `i` of the output
    			output.splice(i++, 0, n);

    		}

    		return ucs2encode(output);
    	}

    	/**
    	 * Converts a string of Unicode symbols (e.g. a domain name label) to a
    	 * Punycode string of ASCII-only symbols.
    	 * @memberOf punycode
    	 * @param {String} input The string of Unicode symbols.
    	 * @returns {String} The resulting Punycode string of ASCII-only symbols.
    	 */
    	function encode(input) {
    		var n,
    		    delta,
    		    handledCPCount,
    		    basicLength,
    		    bias,
    		    j,
    		    m,
    		    q,
    		    k,
    		    t,
    		    currentValue,
    		    output = [],
    		    /** `inputLength` will hold the number of code points in `input`. */
    		    inputLength,
    		    /** Cached calculation results */
    		    handledCPCountPlusOne,
    		    baseMinusT,
    		    qMinusT;

    		// Convert the input in UCS-2 to Unicode
    		input = ucs2decode(input);

    		// Cache the length
    		inputLength = input.length;

    		// Initialize the state
    		n = initialN;
    		delta = 0;
    		bias = initialBias;

    		// Handle the basic code points
    		for (j = 0; j < inputLength; ++j) {
    			currentValue = input[j];
    			if (currentValue < 0x80) {
    				output.push(stringFromCharCode(currentValue));
    			}
    		}

    		handledCPCount = basicLength = output.length;

    		// `handledCPCount` is the number of code points that have been handled;
    		// `basicLength` is the number of basic code points.

    		// Finish the basic string - if it is not empty - with a delimiter
    		if (basicLength) {
    			output.push(delimiter);
    		}

    		// Main encoding loop:
    		while (handledCPCount < inputLength) {

    			// All non-basic code points < n have been handled already. Find the next
    			// larger one:
    			for (m = maxInt, j = 0; j < inputLength; ++j) {
    				currentValue = input[j];
    				if (currentValue >= n && currentValue < m) {
    					m = currentValue;
    				}
    			}

    			// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
    			// but guard against overflow
    			handledCPCountPlusOne = handledCPCount + 1;
    			if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
    				error('overflow');
    			}

    			delta += (m - n) * handledCPCountPlusOne;
    			n = m;

    			for (j = 0; j < inputLength; ++j) {
    				currentValue = input[j];

    				if (currentValue < n && ++delta > maxInt) {
    					error('overflow');
    				}

    				if (currentValue == n) {
    					// Represent delta as a generalized variable-length integer
    					for (q = delta, k = base; /* no condition */; k += base) {
    						t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
    						if (q < t) {
    							break;
    						}
    						qMinusT = q - t;
    						baseMinusT = base - t;
    						output.push(
    							stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
    						);
    						q = floor(qMinusT / baseMinusT);
    					}

    					output.push(stringFromCharCode(digitToBasic(q, 0)));
    					bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
    					delta = 0;
    					++handledCPCount;
    				}
    			}

    			++delta;
    			++n;

    		}
    		return output.join('');
    	}

    	/**
    	 * Converts a Punycode string representing a domain name or an email address
    	 * to Unicode. Only the Punycoded parts of the input will be converted, i.e.
    	 * it doesn't matter if you call it on a string that has already been
    	 * converted to Unicode.
    	 * @memberOf punycode
    	 * @param {String} input The Punycoded domain name or email address to
    	 * convert to Unicode.
    	 * @returns {String} The Unicode representation of the given Punycode
    	 * string.
    	 */
    	function toUnicode(input) {
    		return mapDomain(input, function(string) {
    			return regexPunycode.test(string)
    				? decode(string.slice(4).toLowerCase())
    				: string;
    		});
    	}

    	/**
    	 * Converts a Unicode string representing a domain name or an email address to
    	 * Punycode. Only the non-ASCII parts of the domain name will be converted,
    	 * i.e. it doesn't matter if you call it with a domain that's already in
    	 * ASCII.
    	 * @memberOf punycode
    	 * @param {String} input The domain name or email address to convert, as a
    	 * Unicode string.
    	 * @returns {String} The Punycode representation of the given domain name or
    	 * email address.
    	 */
    	function toASCII(input) {
    		return mapDomain(input, function(string) {
    			return regexNonASCII.test(string)
    				? 'xn--' + encode(string)
    				: string;
    		});
    	}

    	/*--------------------------------------------------------------------------*/

    	/** Define the public API */
    	punycode = {
    		/**
    		 * A string representing the current Punycode.js version number.
    		 * @memberOf punycode
    		 * @type String
    		 */
    		'version': '1.3.2',
    		/**
    		 * An object of methods to convert from JavaScript's internal character
    		 * representation (UCS-2) to Unicode code points, and back.
    		 * @see <https://mathiasbynens.be/notes/javascript-encoding>
    		 * @memberOf punycode
    		 * @type Object
    		 */
    		'ucs2': {
    			'decode': ucs2decode,
    			'encode': ucs2encode
    		},
    		'decode': decode,
    		'encode': encode,
    		'toASCII': toASCII,
    		'toUnicode': toUnicode
    	};

    	/** Expose `punycode` */
    	// Some AMD build optimizers, like r.js, check for specific condition patterns
    	// like the following:
    	if (
    		typeof define == 'function' &&
    		typeof define.amd == 'object' &&
    		define.amd
    	) {
    		define('punycode', function() {
    			return punycode;
    		});
    	} else if (freeExports && freeModule) {
    		if (module.exports == freeExports) {
    			// in Node.js, io.js, or RingoJS v0.8.0+
    			freeModule.exports = punycode;
    		} else {
    			// in Narwhal or RingoJS v0.7.0-
    			for (key in punycode) {
    				punycode.hasOwnProperty(key) && (freeExports[key] = punycode[key]);
    			}
    		}
    	} else {
    		// in Rhino or a web browser
    		root.punycode = punycode;
    	}

    }(this));

    }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{}],44:[function(require,module,exports){
    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    'use strict';

    // If obj.hasOwnProperty has been overridden, then calling
    // obj.hasOwnProperty(prop) will break.
    // See: https://github.com/joyent/node/issues/1707
    function hasOwnProperty(obj, prop) {
      return Object.prototype.hasOwnProperty.call(obj, prop);
    }

    module.exports = function(qs, sep, eq, options) {
      sep = sep || '&';
      eq = eq || '=';
      var obj = {};

      if (typeof qs !== 'string' || qs.length === 0) {
        return obj;
      }

      var regexp = /\+/g;
      qs = qs.split(sep);

      var maxKeys = 1000;
      if (options && typeof options.maxKeys === 'number') {
        maxKeys = options.maxKeys;
      }

      var len = qs.length;
      // maxKeys <= 0 means that we should not limit keys count
      if (maxKeys > 0 && len > maxKeys) {
        len = maxKeys;
      }

      for (var i = 0; i < len; ++i) {
        var x = qs[i].replace(regexp, '%20'),
            idx = x.indexOf(eq),
            kstr, vstr, k, v;

        if (idx >= 0) {
          kstr = x.substr(0, idx);
          vstr = x.substr(idx + 1);
        } else {
          kstr = x;
          vstr = '';
        }

        k = decodeURIComponent(kstr);
        v = decodeURIComponent(vstr);

        if (!hasOwnProperty(obj, k)) {
          obj[k] = v;
        } else if (isArray(obj[k])) {
          obj[k].push(v);
        } else {
          obj[k] = [obj[k], v];
        }
      }

      return obj;
    };

    var isArray = Array.isArray || function (xs) {
      return Object.prototype.toString.call(xs) === '[object Array]';
    };

    },{}],45:[function(require,module,exports){
    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    'use strict';

    var stringifyPrimitive = function(v) {
      switch (typeof v) {
        case 'string':
          return v;

        case 'boolean':
          return v ? 'true' : 'false';

        case 'number':
          return isFinite(v) ? v : '';

        default:
          return '';
      }
    };

    module.exports = function(obj, sep, eq, name) {
      sep = sep || '&';
      eq = eq || '=';
      if (obj === null) {
        obj = undefined;
      }

      if (typeof obj === 'object') {
        return map(objectKeys(obj), function(k) {
          var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;
          if (isArray(obj[k])) {
            return map(obj[k], function(v) {
              return ks + encodeURIComponent(stringifyPrimitive(v));
            }).join(sep);
          } else {
            return ks + encodeURIComponent(stringifyPrimitive(obj[k]));
          }
        }).join(sep);

      }

      if (!name) return '';
      return encodeURIComponent(stringifyPrimitive(name)) + eq +
             encodeURIComponent(stringifyPrimitive(obj));
    };

    var isArray = Array.isArray || function (xs) {
      return Object.prototype.toString.call(xs) === '[object Array]';
    };

    function map (xs, f) {
      if (xs.map) return xs.map(f);
      var res = [];
      for (var i = 0; i < xs.length; i++) {
        res.push(f(xs[i], i));
      }
      return res;
    }

    var objectKeys = Object.keys || function (obj) {
      var res = [];
      for (var key in obj) {
        if (Object.prototype.hasOwnProperty.call(obj, key)) res.push(key);
      }
      return res;
    };

    },{}],46:[function(require,module,exports){
    'use strict';

    exports.decode = exports.parse = require('./decode');
    exports.encode = exports.stringify = require('./encode');

    },{"./decode":44,"./encode":45}],47:[function(require,module,exports){
    module.exports = require("./lib/_stream_duplex.js")

    },{"./lib/_stream_duplex.js":48}],48:[function(require,module,exports){
    // a duplex stream is just a stream that is both readable and writable.
    // Since JS doesn't have multiple prototypal inheritance, this class
    // prototypally inherits from Readable, and then parasitically from
    // Writable.

    'use strict';

    /*<replacement>*/
    var objectKeys = Object.keys || function (obj) {
      var keys = [];
      for (var key in obj) keys.push(key);
      return keys;
    }
    /*</replacement>*/

    module.exports = Duplex;

    /*<replacement>*/
    var processNextTick = require('process-nextick-args');
    /*</replacement>*/

    /*<replacement>*/
    var util = require('core-util-is');
    util.inherits = require('inherits');
    /*</replacement>*/

    var Readable = require('./_stream_readable');
    var Writable = require('./_stream_writable');

    util.inherits(Duplex, Readable);

    var keys = objectKeys(Writable.prototype);
    for (var v = 0; v < keys.length; v++) {
      var method = keys[v];
      if (!Duplex.prototype[method])
        Duplex.prototype[method] = Writable.prototype[method];
    }

    function Duplex(options) {
      if (!(this instanceof Duplex))
        return new Duplex(options);

      Readable.call(this, options);
      Writable.call(this, options);

      if (options && options.readable === false)
        this.readable = false;

      if (options && options.writable === false)
        this.writable = false;

      this.allowHalfOpen = true;
      if (options && options.allowHalfOpen === false)
        this.allowHalfOpen = false;

      this.once('end', onend);
    }

    // the no-half-open enforcer
    function onend() {
      // if we allow half-open state, or if the writable side ended,
      // then we're ok.
      if (this.allowHalfOpen || this._writableState.ended)
        return;

      // no more data can be written.
      // But allow more writes to happen in this tick.
      processNextTick(onEndNT, this);
    }

    function onEndNT(self) {
      self.end();
    }

    function forEach (xs, f) {
      for (var i = 0, l = xs.length; i < l; i++) {
        f(xs[i], i);
      }
    }

    },{"./_stream_readable":50,"./_stream_writable":52,"core-util-is":53,"inherits":38,"process-nextick-args":54}],49:[function(require,module,exports){
    // a passthrough stream.
    // basically just the most minimal sort of Transform stream.
    // Every written chunk gets output as-is.

    'use strict';

    module.exports = PassThrough;

    var Transform = require('./_stream_transform');

    /*<replacement>*/
    var util = require('core-util-is');
    util.inherits = require('inherits');
    /*</replacement>*/

    util.inherits(PassThrough, Transform);

    function PassThrough(options) {
      if (!(this instanceof PassThrough))
        return new PassThrough(options);

      Transform.call(this, options);
    }

    PassThrough.prototype._transform = function(chunk, encoding, cb) {
      cb(null, chunk);
    };

    },{"./_stream_transform":51,"core-util-is":53,"inherits":38}],50:[function(require,module,exports){
    (function (process){
    'use strict';

    module.exports = Readable;

    /*<replacement>*/
    var processNextTick = require('process-nextick-args');
    /*</replacement>*/

    /*<replacement>*/
    var isArray = require('isarray');
    /*</replacement>*/

    /*<replacement>*/
    var Buffer = require('buffer').Buffer;
    /*</replacement>*/

    Readable.ReadableState = ReadableState;

    var EE = require('events');

    /*<replacement>*/
    var EElistenerCount = function(emitter, type) {
      return emitter.listeners(type).length;
    };
    /*</replacement>*/

    /*<replacement>*/
    var Stream;
    (function (){try{
      Stream = require('st' + 'ream');
    }catch(_){}finally{
      if (!Stream)
        Stream = require('events').EventEmitter;
    }}())
    /*</replacement>*/

    var Buffer = require('buffer').Buffer;

    /*<replacement>*/
    var util = require('core-util-is');
    util.inherits = require('inherits');
    /*</replacement>*/

    /*<replacement>*/
    var debugUtil = require('util');
    var debug;
    if (debugUtil && debugUtil.debuglog) {
      debug = debugUtil.debuglog('stream');
    } else {
      debug = function () {};
    }
    /*</replacement>*/

    var StringDecoder;

    util.inherits(Readable, Stream);

    var Duplex;
    function ReadableState(options, stream) {
      Duplex = Duplex || require('./_stream_duplex');

      options = options || {};

      // object stream flag. Used to make read(n) ignore n and to
      // make all the buffer merging and length checks go away
      this.objectMode = !!options.objectMode;

      if (stream instanceof Duplex)
        this.objectMode = this.objectMode || !!options.readableObjectMode;

      // the point at which it stops calling _read() to fill the buffer
      // Note: 0 is a valid value, means "don't call _read preemptively ever"
      var hwm = options.highWaterMark;
      var defaultHwm = this.objectMode ? 16 : 16 * 1024;
      this.highWaterMark = (hwm || hwm === 0) ? hwm : defaultHwm;

      // cast to ints.
      this.highWaterMark = ~~this.highWaterMark;

      this.buffer = [];
      this.length = 0;
      this.pipes = null;
      this.pipesCount = 0;
      this.flowing = null;
      this.ended = false;
      this.endEmitted = false;
      this.reading = false;

      // a flag to be able to tell if the onwrite cb is called immediately,
      // or on a later tick.  We set this to true at first, because any
      // actions that shouldn't happen until "later" should generally also
      // not happen before the first write call.
      this.sync = true;

      // whenever we return null, then we set a flag to say
      // that we're awaiting a 'readable' event emission.
      this.needReadable = false;
      this.emittedReadable = false;
      this.readableListening = false;

      // Crypto is kind of old and crusty.  Historically, its default string
      // encoding is 'binary' so we have to make this configurable.
      // Everything else in the universe uses 'utf8', though.
      this.defaultEncoding = options.defaultEncoding || 'utf8';

      // when piping, we only care about 'readable' events that happen
      // after read()ing all the bytes and not getting any pushback.
      this.ranOut = false;

      // the number of writers that are awaiting a drain event in .pipe()s
      this.awaitDrain = 0;

      // if true, a maybeReadMore has been scheduled
      this.readingMore = false;

      this.decoder = null;
      this.encoding = null;
      if (options.encoding) {
        if (!StringDecoder)
          StringDecoder = require('string_decoder/').StringDecoder;
        this.decoder = new StringDecoder(options.encoding);
        this.encoding = options.encoding;
      }
    }

    var Duplex;
    function Readable(options) {
      Duplex = Duplex || require('./_stream_duplex');

      if (!(this instanceof Readable))
        return new Readable(options);

      this._readableState = new ReadableState(options, this);

      // legacy
      this.readable = true;

      if (options && typeof options.read === 'function')
        this._read = options.read;

      Stream.call(this);
    }

    // Manually shove something into the read() buffer.
    // This returns true if the highWaterMark has not been hit yet,
    // similar to how Writable.write() returns true if you should
    // write() some more.
    Readable.prototype.push = function(chunk, encoding) {
      var state = this._readableState;

      if (!state.objectMode && typeof chunk === 'string') {
        encoding = encoding || state.defaultEncoding;
        if (encoding !== state.encoding) {
          chunk = new Buffer(chunk, encoding);
          encoding = '';
        }
      }

      return readableAddChunk(this, state, chunk, encoding, false);
    };

    // Unshift should *always* be something directly out of read()
    Readable.prototype.unshift = function(chunk) {
      var state = this._readableState;
      return readableAddChunk(this, state, chunk, '', true);
    };

    Readable.prototype.isPaused = function() {
      return this._readableState.flowing === false;
    };

    function readableAddChunk(stream, state, chunk, encoding, addToFront) {
      var er = chunkInvalid(state, chunk);
      if (er) {
        stream.emit('error', er);
      } else if (chunk === null) {
        state.reading = false;
        onEofChunk(stream, state);
      } else if (state.objectMode || chunk && chunk.length > 0) {
        if (state.ended && !addToFront) {
          var e = new Error('stream.push() after EOF');
          stream.emit('error', e);
        } else if (state.endEmitted && addToFront) {
          var e = new Error('stream.unshift() after end event');
          stream.emit('error', e);
        } else {
          if (state.decoder && !addToFront && !encoding)
            chunk = state.decoder.write(chunk);

          if (!addToFront)
            state.reading = false;

          // if we want the data now, just emit it.
          if (state.flowing && state.length === 0 && !state.sync) {
            stream.emit('data', chunk);
            stream.read(0);
          } else {
            // update the buffer info.
            state.length += state.objectMode ? 1 : chunk.length;
            if (addToFront)
              state.buffer.unshift(chunk);
            else
              state.buffer.push(chunk);

            if (state.needReadable)
              emitReadable(stream);
          }

          maybeReadMore(stream, state);
        }
      } else if (!addToFront) {
        state.reading = false;
      }

      return needMoreData(state);
    }

    // if it's past the high water mark, we can push in some more.
    // Also, if we have no data yet, we can stand some
    // more bytes.  This is to work around cases where hwm=0,
    // such as the repl.  Also, if the push() triggered a
    // readable event, and the user called read(largeNumber) such that
    // needReadable was set, then we ought to push more, so that another
    // 'readable' event will be triggered.
    function needMoreData(state) {
      return !state.ended &&
             (state.needReadable ||
              state.length < state.highWaterMark ||
              state.length === 0);
    }

    // backwards compatibility.
    Readable.prototype.setEncoding = function(enc) {
      if (!StringDecoder)
        StringDecoder = require('string_decoder/').StringDecoder;
      this._readableState.decoder = new StringDecoder(enc);
      this._readableState.encoding = enc;
      return this;
    };

    // Don't raise the hwm > 8MB
    var MAX_HWM = 0x800000;
    function computeNewHighWaterMark(n) {
      if (n >= MAX_HWM) {
        n = MAX_HWM;
      } else {
        // Get the next highest power of 2
        n--;
        n |= n >>> 1;
        n |= n >>> 2;
        n |= n >>> 4;
        n |= n >>> 8;
        n |= n >>> 16;
        n++;
      }
      return n;
    }

    function howMuchToRead(n, state) {
      if (state.length === 0 && state.ended)
        return 0;

      if (state.objectMode)
        return n === 0 ? 0 : 1;

      if (n === null || isNaN(n)) {
        // only flow one buffer at a time
        if (state.flowing && state.buffer.length)
          return state.buffer[0].length;
        else
          return state.length;
      }

      if (n <= 0)
        return 0;

      // If we're asking for more than the target buffer level,
      // then raise the water mark.  Bump up to the next highest
      // power of 2, to prevent increasing it excessively in tiny
      // amounts.
      if (n > state.highWaterMark)
        state.highWaterMark = computeNewHighWaterMark(n);

      // don't have that much.  return null, unless we've ended.
      if (n > state.length) {
        if (!state.ended) {
          state.needReadable = true;
          return 0;
        } else {
          return state.length;
        }
      }

      return n;
    }

    // you can override either this method, or the async _read(n) below.
    Readable.prototype.read = function(n) {
      debug('read', n);
      var state = this._readableState;
      var nOrig = n;

      if (typeof n !== 'number' || n > 0)
        state.emittedReadable = false;

      // if we're doing read(0) to trigger a readable event, but we
      // already have a bunch of data in the buffer, then just trigger
      // the 'readable' event and move on.
      if (n === 0 &&
          state.needReadable &&
          (state.length >= state.highWaterMark || state.ended)) {
        debug('read: emitReadable', state.length, state.ended);
        if (state.length === 0 && state.ended)
          endReadable(this);
        else
          emitReadable(this);
        return null;
      }

      n = howMuchToRead(n, state);

      // if we've ended, and we're now clear, then finish it up.
      if (n === 0 && state.ended) {
        if (state.length === 0)
          endReadable(this);
        return null;
      }

      // All the actual chunk generation logic needs to be
      // *below* the call to _read.  The reason is that in certain
      // synthetic stream cases, such as passthrough streams, _read
      // may be a completely synchronous operation which may change
      // the state of the read buffer, providing enough data when
      // before there was *not* enough.
      //
      // So, the steps are:
      // 1. Figure out what the state of things will be after we do
      // a read from the buffer.
      //
      // 2. If that resulting state will trigger a _read, then call _read.
      // Note that this may be asynchronous, or synchronous.  Yes, it is
      // deeply ugly to write APIs this way, but that still doesn't mean
      // that the Readable class should behave improperly, as streams are
      // designed to be sync/async agnostic.
      // Take note if the _read call is sync or async (ie, if the read call
      // has returned yet), so that we know whether or not it's safe to emit
      // 'readable' etc.
      //
      // 3. Actually pull the requested chunks out of the buffer and return.

      // if we need a readable event, then we need to do some reading.
      var doRead = state.needReadable;
      debug('need readable', doRead);

      // if we currently have less than the highWaterMark, then also read some
      if (state.length === 0 || state.length - n < state.highWaterMark) {
        doRead = true;
        debug('length less than watermark', doRead);
      }

      // however, if we've ended, then there's no point, and if we're already
      // reading, then it's unnecessary.
      if (state.ended || state.reading) {
        doRead = false;
        debug('reading or ended', doRead);
      }

      if (doRead) {
        debug('do read');
        state.reading = true;
        state.sync = true;
        // if the length is currently zero, then we *need* a readable event.
        if (state.length === 0)
          state.needReadable = true;
        // call internal read method
        this._read(state.highWaterMark);
        state.sync = false;
      }

      // If _read pushed data synchronously, then `reading` will be false,
      // and we need to re-evaluate how much data we can return to the user.
      if (doRead && !state.reading)
        n = howMuchToRead(nOrig, state);

      var ret;
      if (n > 0)
        ret = fromList(n, state);
      else
        ret = null;

      if (ret === null) {
        state.needReadable = true;
        n = 0;
      }

      state.length -= n;

      // If we have nothing in the buffer, then we want to know
      // as soon as we *do* get something into the buffer.
      if (state.length === 0 && !state.ended)
        state.needReadable = true;

      // If we tried to read() past the EOF, then emit end on the next tick.
      if (nOrig !== n && state.ended && state.length === 0)
        endReadable(this);

      if (ret !== null)
        this.emit('data', ret);

      return ret;
    };

    function chunkInvalid(state, chunk) {
      var er = null;
      if (!(Buffer.isBuffer(chunk)) &&
          typeof chunk !== 'string' &&
          chunk !== null &&
          chunk !== undefined &&
          !state.objectMode) {
        er = new TypeError('Invalid non-string/buffer chunk');
      }
      return er;
    }

    function onEofChunk(stream, state) {
      if (state.ended) return;
      if (state.decoder) {
        var chunk = state.decoder.end();
        if (chunk && chunk.length) {
          state.buffer.push(chunk);
          state.length += state.objectMode ? 1 : chunk.length;
        }
      }
      state.ended = true;

      // emit 'readable' now to make sure it gets picked up.
      emitReadable(stream);
    }

    // Don't emit readable right away in sync mode, because this can trigger
    // another read() call => stack overflow.  This way, it might trigger
    // a nextTick recursion warning, but that's not so bad.
    function emitReadable(stream) {
      var state = stream._readableState;
      state.needReadable = false;
      if (!state.emittedReadable) {
        debug('emitReadable', state.flowing);
        state.emittedReadable = true;
        if (state.sync)
          processNextTick(emitReadable_, stream);
        else
          emitReadable_(stream);
      }
    }

    function emitReadable_(stream) {
      debug('emit readable');
      stream.emit('readable');
      flow(stream);
    }

    // at this point, the user has presumably seen the 'readable' event,
    // and called read() to consume some data.  that may have triggered
    // in turn another _read(n) call, in which case reading = true if
    // it's in progress.
    // However, if we're not ended, or reading, and the length < hwm,
    // then go ahead and try to read some more preemptively.
    function maybeReadMore(stream, state) {
      if (!state.readingMore) {
        state.readingMore = true;
        processNextTick(maybeReadMore_, stream, state);
      }
    }

    function maybeReadMore_(stream, state) {
      var len = state.length;
      while (!state.reading && !state.flowing && !state.ended &&
             state.length < state.highWaterMark) {
        debug('maybeReadMore read 0');
        stream.read(0);
        if (len === state.length)
          // didn't get any data, stop spinning.
          break;
        else
          len = state.length;
      }
      state.readingMore = false;
    }

    // abstract method.  to be overridden in specific implementation classes.
    // call cb(er, data) where data is <= n in length.
    // for virtual (non-string, non-buffer) streams, "length" is somewhat
    // arbitrary, and perhaps not very meaningful.
    Readable.prototype._read = function(n) {
      this.emit('error', new Error('not implemented'));
    };

    Readable.prototype.pipe = function(dest, pipeOpts) {
      var src = this;
      var state = this._readableState;

      switch (state.pipesCount) {
        case 0:
          state.pipes = dest;
          break;
        case 1:
          state.pipes = [state.pipes, dest];
          break;
        default:
          state.pipes.push(dest);
          break;
      }
      state.pipesCount += 1;
      debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);

      var doEnd = (!pipeOpts || pipeOpts.end !== false) &&
                  dest !== process.stdout &&
                  dest !== process.stderr;

      var endFn = doEnd ? onend : cleanup;
      if (state.endEmitted)
        processNextTick(endFn);
      else
        src.once('end', endFn);

      dest.on('unpipe', onunpipe);
      function onunpipe(readable) {
        debug('onunpipe');
        if (readable === src) {
          cleanup();
        }
      }

      function onend() {
        debug('onend');
        dest.end();
      }

      // when the dest drains, it reduces the awaitDrain counter
      // on the source.  This would be more elegant with a .once()
      // handler in flow(), but adding and removing repeatedly is
      // too slow.
      var ondrain = pipeOnDrain(src);
      dest.on('drain', ondrain);

      var cleanedUp = false;
      function cleanup() {
        debug('cleanup');
        // cleanup event handlers once the pipe is broken
        dest.removeListener('close', onclose);
        dest.removeListener('finish', onfinish);
        dest.removeListener('drain', ondrain);
        dest.removeListener('error', onerror);
        dest.removeListener('unpipe', onunpipe);
        src.removeListener('end', onend);
        src.removeListener('end', cleanup);
        src.removeListener('data', ondata);

        cleanedUp = true;

        // if the reader is waiting for a drain event from this
        // specific writer, then it would cause it to never start
        // flowing again.
        // So, if this is awaiting a drain, then we just call it now.
        // If we don't know, then assume that we are waiting for one.
        if (state.awaitDrain &&
            (!dest._writableState || dest._writableState.needDrain))
          ondrain();
      }

      src.on('data', ondata);
      function ondata(chunk) {
        debug('ondata');
        var ret = dest.write(chunk);
        if (false === ret) {
          // If the user unpiped during `dest.write()`, it is possible
          // to get stuck in a permanently paused state if that write
          // also returned false.
          if (state.pipesCount === 1 &&
              state.pipes[0] === dest &&
              src.listenerCount('data') === 1 &&
              !cleanedUp) {
            debug('false write response, pause', src._readableState.awaitDrain);
            src._readableState.awaitDrain++;
          }
          src.pause();
        }
      }

      // if the dest has an error, then stop piping into it.
      // however, don't suppress the throwing behavior for this.
      function onerror(er) {
        debug('onerror', er);
        unpipe();
        dest.removeListener('error', onerror);
        if (EElistenerCount(dest, 'error') === 0)
          dest.emit('error', er);
      }
      // This is a brutally ugly hack to make sure that our error handler
      // is attached before any userland ones.  NEVER DO THIS.
      if (!dest._events || !dest._events.error)
        dest.on('error', onerror);
      else if (isArray(dest._events.error))
        dest._events.error.unshift(onerror);
      else
        dest._events.error = [onerror, dest._events.error];

      // Both close and finish should trigger unpipe, but only once.
      function onclose() {
        dest.removeListener('finish', onfinish);
        unpipe();
      }
      dest.once('close', onclose);
      function onfinish() {
        debug('onfinish');
        dest.removeListener('close', onclose);
        unpipe();
      }
      dest.once('finish', onfinish);

      function unpipe() {
        debug('unpipe');
        src.unpipe(dest);
      }

      // tell the dest that it's being piped to
      dest.emit('pipe', src);

      // start the flow if it hasn't been started already.
      if (!state.flowing) {
        debug('pipe resume');
        src.resume();
      }

      return dest;
    };

    function pipeOnDrain(src) {
      return function() {
        var state = src._readableState;
        debug('pipeOnDrain', state.awaitDrain);
        if (state.awaitDrain)
          state.awaitDrain--;
        if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
          state.flowing = true;
          flow(src);
        }
      };
    }

    Readable.prototype.unpipe = function(dest) {
      var state = this._readableState;

      // if we're not piping anywhere, then do nothing.
      if (state.pipesCount === 0)
        return this;

      // just one destination.  most common case.
      if (state.pipesCount === 1) {
        // passed in one, but it's not the right one.
        if (dest && dest !== state.pipes)
          return this;

        if (!dest)
          dest = state.pipes;

        // got a match.
        state.pipes = null;
        state.pipesCount = 0;
        state.flowing = false;
        if (dest)
          dest.emit('unpipe', this);
        return this;
      }

      // slow case. multiple pipe destinations.

      if (!dest) {
        // remove all.
        var dests = state.pipes;
        var len = state.pipesCount;
        state.pipes = null;
        state.pipesCount = 0;
        state.flowing = false;

        for (var i = 0; i < len; i++)
          dests[i].emit('unpipe', this);
        return this;
      }

      // try to find the right one.
      var i = indexOf(state.pipes, dest);
      if (i === -1)
        return this;

      state.pipes.splice(i, 1);
      state.pipesCount -= 1;
      if (state.pipesCount === 1)
        state.pipes = state.pipes[0];

      dest.emit('unpipe', this);

      return this;
    };

    // set up data events if they are asked for
    // Ensure readable listeners eventually get something
    Readable.prototype.on = function(ev, fn) {
      var res = Stream.prototype.on.call(this, ev, fn);

      // If listening to data, and it has not explicitly been paused,
      // then call resume to start the flow of data on the next tick.
      if (ev === 'data' && false !== this._readableState.flowing) {
        this.resume();
      }

      if (ev === 'readable' && this.readable) {
        var state = this._readableState;
        if (!state.readableListening) {
          state.readableListening = true;
          state.emittedReadable = false;
          state.needReadable = true;
          if (!state.reading) {
            processNextTick(nReadingNextTick, this);
          } else if (state.length) {
            emitReadable(this, state);
          }
        }
      }

      return res;
    };
    Readable.prototype.addListener = Readable.prototype.on;

    function nReadingNextTick(self) {
      debug('readable nexttick read 0');
      self.read(0);
    }

    // pause() and resume() are remnants of the legacy readable stream API
    // If the user uses them, then switch into old mode.
    Readable.prototype.resume = function() {
      var state = this._readableState;
      if (!state.flowing) {
        debug('resume');
        state.flowing = true;
        resume(this, state);
      }
      return this;
    };

    function resume(stream, state) {
      if (!state.resumeScheduled) {
        state.resumeScheduled = true;
        processNextTick(resume_, stream, state);
      }
    }

    function resume_(stream, state) {
      if (!state.reading) {
        debug('resume read 0');
        stream.read(0);
      }

      state.resumeScheduled = false;
      stream.emit('resume');
      flow(stream);
      if (state.flowing && !state.reading)
        stream.read(0);
    }

    Readable.prototype.pause = function() {
      debug('call pause flowing=%j', this._readableState.flowing);
      if (false !== this._readableState.flowing) {
        debug('pause');
        this._readableState.flowing = false;
        this.emit('pause');
      }
      return this;
    };

    function flow(stream) {
      var state = stream._readableState;
      debug('flow', state.flowing);
      if (state.flowing) {
        do {
          var chunk = stream.read();
        } while (null !== chunk && state.flowing);
      }
    }

    // wrap an old-style stream as the async data source.
    // This is *not* part of the readable stream interface.
    // It is an ugly unfortunate mess of history.
    Readable.prototype.wrap = function(stream) {
      var state = this._readableState;
      var paused = false;

      var self = this;
      stream.on('end', function() {
        debug('wrapped end');
        if (state.decoder && !state.ended) {
          var chunk = state.decoder.end();
          if (chunk && chunk.length)
            self.push(chunk);
        }

        self.push(null);
      });

      stream.on('data', function(chunk) {
        debug('wrapped data');
        if (state.decoder)
          chunk = state.decoder.write(chunk);

        // don't skip over falsy values in objectMode
        if (state.objectMode && (chunk === null || chunk === undefined))
          return;
        else if (!state.objectMode && (!chunk || !chunk.length))
          return;

        var ret = self.push(chunk);
        if (!ret) {
          paused = true;
          stream.pause();
        }
      });

      // proxy all the other methods.
      // important when wrapping filters and duplexes.
      for (var i in stream) {
        if (this[i] === undefined && typeof stream[i] === 'function') {
          this[i] = function(method) { return function() {
            return stream[method].apply(stream, arguments);
          }; }(i);
        }
      }

      // proxy certain important events.
      var events = ['error', 'close', 'destroy', 'pause', 'resume'];
      forEach(events, function(ev) {
        stream.on(ev, self.emit.bind(self, ev));
      });

      // when we try to consume some more bytes, simply unpause the
      // underlying stream.
      self._read = function(n) {
        debug('wrapped _read', n);
        if (paused) {
          paused = false;
          stream.resume();
        }
      };

      return self;
    };

    // exposed for testing purposes only.
    Readable._fromList = fromList;

    // Pluck off n bytes from an array of buffers.
    // Length is the combined lengths of all the buffers in the list.
    function fromList(n, state) {
      var list = state.buffer;
      var length = state.length;
      var stringMode = !!state.decoder;
      var objectMode = !!state.objectMode;
      var ret;

      // nothing in the list, definitely empty.
      if (list.length === 0)
        return null;

      if (length === 0)
        ret = null;
      else if (objectMode)
        ret = list.shift();
      else if (!n || n >= length) {
        // read it all, truncate the array.
        if (stringMode)
          ret = list.join('');
        else if (list.length === 1)
          ret = list[0];
        else
          ret = Buffer.concat(list, length);
        list.length = 0;
      } else {
        // read just some of it.
        if (n < list[0].length) {
          // just take a part of the first list item.
          // slice is the same for buffers and strings.
          var buf = list[0];
          ret = buf.slice(0, n);
          list[0] = buf.slice(n);
        } else if (n === list[0].length) {
          // first list is a perfect match
          ret = list.shift();
        } else {
          // complex case.
          // we have enough to cover it, but it spans past the first buffer.
          if (stringMode)
            ret = '';
          else
            ret = new Buffer(n);

          var c = 0;
          for (var i = 0, l = list.length; i < l && c < n; i++) {
            var buf = list[0];
            var cpy = Math.min(n - c, buf.length);

            if (stringMode)
              ret += buf.slice(0, cpy);
            else
              buf.copy(ret, c, 0, cpy);

            if (cpy < buf.length)
              list[0] = buf.slice(cpy);
            else
              list.shift();

            c += cpy;
          }
        }
      }

      return ret;
    }

    function endReadable(stream) {
      var state = stream._readableState;

      // If we get here before consuming all the bytes, then that is a
      // bug in node.  Should never happen.
      if (state.length > 0)
        throw new Error('endReadable called on non-empty stream');

      if (!state.endEmitted) {
        state.ended = true;
        processNextTick(endReadableNT, state, stream);
      }
    }

    function endReadableNT(state, stream) {
      // Check that we didn't get one last unshift.
      if (!state.endEmitted && state.length === 0) {
        state.endEmitted = true;
        stream.readable = false;
        stream.emit('end');
      }
    }

    function forEach (xs, f) {
      for (var i = 0, l = xs.length; i < l; i++) {
        f(xs[i], i);
      }
    }

    function indexOf (xs, x) {
      for (var i = 0, l = xs.length; i < l; i++) {
        if (xs[i] === x) return i;
      }
      return -1;
    }

    }).call(this,require('_process'))
    },{"./_stream_duplex":48,"_process":42,"buffer":33,"core-util-is":53,"events":37,"inherits":38,"isarray":40,"process-nextick-args":54,"string_decoder/":70,"util":32}],51:[function(require,module,exports){
    // a transform stream is a readable/writable stream where you do
    // something with the data.  Sometimes it's called a "filter",
    // but that's not a great name for it, since that implies a thing where
    // some bits pass through, and others are simply ignored.  (That would
    // be a valid example of a transform, of course.)
    //
    // While the output is causally related to the input, it's not a
    // necessarily symmetric or synchronous transformation.  For example,
    // a zlib stream might take multiple plain-text writes(), and then
    // emit a single compressed chunk some time in the future.
    //
    // Here's how this works:
    //
    // The Transform stream has all the aspects of the readable and writable
    // stream classes.  When you write(chunk), that calls _write(chunk,cb)
    // internally, and returns false if there's a lot of pending writes
    // buffered up.  When you call read(), that calls _read(n) until
    // there's enough pending readable data buffered up.
    //
    // In a transform stream, the written data is placed in a buffer.  When
    // _read(n) is called, it transforms the queued up data, calling the
    // buffered _write cb's as it consumes chunks.  If consuming a single
    // written chunk would result in multiple output chunks, then the first
    // outputted bit calls the readcb, and subsequent chunks just go into
    // the read buffer, and will cause it to emit 'readable' if necessary.
    //
    // This way, back-pressure is actually determined by the reading side,
    // since _read has to be called to start processing a new chunk.  However,
    // a pathological inflate type of transform can cause excessive buffering
    // here.  For example, imagine a stream where every byte of input is
    // interpreted as an integer from 0-255, and then results in that many
    // bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
    // 1kb of data being output.  In this case, you could write a very small
    // amount of input, and end up with a very large amount of output.  In
    // such a pathological inflating mechanism, there'd be no way to tell
    // the system to stop doing the transform.  A single 4MB write could
    // cause the system to run out of memory.
    //
    // However, even in such a pathological case, only a single written chunk
    // would be consumed, and then the rest would wait (un-transformed) until
    // the results of the previous transformed chunk were consumed.

    'use strict';

    module.exports = Transform;

    var Duplex = require('./_stream_duplex');

    /*<replacement>*/
    var util = require('core-util-is');
    util.inherits = require('inherits');
    /*</replacement>*/

    util.inherits(Transform, Duplex);

    function TransformState(stream) {
      this.afterTransform = function(er, data) {
        return afterTransform(stream, er, data);
      };

      this.needTransform = false;
      this.transforming = false;
      this.writecb = null;
      this.writechunk = null;
    }

    function afterTransform(stream, er, data) {
      var ts = stream._transformState;
      ts.transforming = false;

      var cb = ts.writecb;

      if (!cb)
        return stream.emit('error', new Error('no writecb in Transform class'));

      ts.writechunk = null;
      ts.writecb = null;

      if (data !== null && data !== undefined)
        stream.push(data);

      if (cb)
        cb(er);

      var rs = stream._readableState;
      rs.reading = false;
      if (rs.needReadable || rs.length < rs.highWaterMark) {
        stream._read(rs.highWaterMark);
      }
    }

    function Transform(options) {
      if (!(this instanceof Transform))
        return new Transform(options);

      Duplex.call(this, options);

      this._transformState = new TransformState(this);

      // when the writable side finishes, then flush out anything remaining.
      var stream = this;

      // start out asking for a readable event once data is transformed.
      this._readableState.needReadable = true;

      // we have implemented the _read method, and done the other things
      // that Readable wants before the first _read call, so unset the
      // sync guard flag.
      this._readableState.sync = false;

      if (options) {
        if (typeof options.transform === 'function')
          this._transform = options.transform;

        if (typeof options.flush === 'function')
          this._flush = options.flush;
      }

      this.once('prefinish', function() {
        if (typeof this._flush === 'function')
          this._flush(function(er) {
            done(stream, er);
          });
        else
          done(stream);
      });
    }

    Transform.prototype.push = function(chunk, encoding) {
      this._transformState.needTransform = false;
      return Duplex.prototype.push.call(this, chunk, encoding);
    };

    // This is the part where you do stuff!
    // override this function in implementation classes.
    // 'chunk' is an input chunk.
    //
    // Call `push(newChunk)` to pass along transformed output
    // to the readable side.  You may call 'push' zero or more times.
    //
    // Call `cb(err)` when you are done with this chunk.  If you pass
    // an error, then that'll put the hurt on the whole operation.  If you
    // never call cb(), then you'll never get another chunk.
    Transform.prototype._transform = function(chunk, encoding, cb) {
      throw new Error('not implemented');
    };

    Transform.prototype._write = function(chunk, encoding, cb) {
      var ts = this._transformState;
      ts.writecb = cb;
      ts.writechunk = chunk;
      ts.writeencoding = encoding;
      if (!ts.transforming) {
        var rs = this._readableState;
        if (ts.needTransform ||
            rs.needReadable ||
            rs.length < rs.highWaterMark)
          this._read(rs.highWaterMark);
      }
    };

    // Doesn't matter what the args are here.
    // _transform does all the work.
    // That we got here means that the readable side wants more data.
    Transform.prototype._read = function(n) {
      var ts = this._transformState;

      if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
        ts.transforming = true;
        this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
      } else {
        // mark that we need a transform, so that any data that comes in
        // will get processed, now that we've asked for it.
        ts.needTransform = true;
      }
    };

    function done(stream, er) {
      if (er)
        return stream.emit('error', er);

      // if there's nothing in the write buffer, then that means
      // that nothing more will ever be provided
      var ws = stream._writableState;
      var ts = stream._transformState;

      if (ws.length)
        throw new Error('calling transform done when ws.length != 0');

      if (ts.transforming)
        throw new Error('calling transform done when still transforming');

      return stream.push(null);
    }

    },{"./_stream_duplex":48,"core-util-is":53,"inherits":38}],52:[function(require,module,exports){
    // A bit simpler than readable streams.
    // Implement an async ._write(chunk, encoding, cb), and it'll handle all
    // the drain event emission and buffering.

    'use strict';

    module.exports = Writable;

    /*<replacement>*/
    var processNextTick = require('process-nextick-args');
    /*</replacement>*/

    /*<replacement>*/
    var Buffer = require('buffer').Buffer;
    /*</replacement>*/

    Writable.WritableState = WritableState;

    /*<replacement>*/
    var util = require('core-util-is');
    util.inherits = require('inherits');
    /*</replacement>*/

    /*<replacement>*/
    var internalUtil = {
      deprecate: require('util-deprecate')
    };
    /*</replacement>*/

    /*<replacement>*/
    var Stream;
    (function (){try{
      Stream = require('st' + 'ream');
    }catch(_){}finally{
      if (!Stream)
        Stream = require('events').EventEmitter;
    }}())
    /*</replacement>*/

    var Buffer = require('buffer').Buffer;

    util.inherits(Writable, Stream);

    function nop() {}

    function WriteReq(chunk, encoding, cb) {
      this.chunk = chunk;
      this.encoding = encoding;
      this.callback = cb;
      this.next = null;
    }

    var Duplex;
    function WritableState(options, stream) {
      Duplex = Duplex || require('./_stream_duplex');

      options = options || {};

      // object stream flag to indicate whether or not this stream
      // contains buffers or objects.
      this.objectMode = !!options.objectMode;

      if (stream instanceof Duplex)
        this.objectMode = this.objectMode || !!options.writableObjectMode;

      // the point at which write() starts returning false
      // Note: 0 is a valid value, means that we always return false if
      // the entire buffer is not flushed immediately on write()
      var hwm = options.highWaterMark;
      var defaultHwm = this.objectMode ? 16 : 16 * 1024;
      this.highWaterMark = (hwm || hwm === 0) ? hwm : defaultHwm;

      // cast to ints.
      this.highWaterMark = ~~this.highWaterMark;

      this.needDrain = false;
      // at the start of calling end()
      this.ending = false;
      // when end() has been called, and returned
      this.ended = false;
      // when 'finish' is emitted
      this.finished = false;

      // should we decode strings into buffers before passing to _write?
      // this is here so that some node-core streams can optimize string
      // handling at a lower level.
      var noDecode = options.decodeStrings === false;
      this.decodeStrings = !noDecode;

      // Crypto is kind of old and crusty.  Historically, its default string
      // encoding is 'binary' so we have to make this configurable.
      // Everything else in the universe uses 'utf8', though.
      this.defaultEncoding = options.defaultEncoding || 'utf8';

      // not an actual buffer we keep track of, but a measurement
      // of how much we're waiting to get pushed to some underlying
      // socket or file.
      this.length = 0;

      // a flag to see when we're in the middle of a write.
      this.writing = false;

      // when true all writes will be buffered until .uncork() call
      this.corked = 0;

      // a flag to be able to tell if the onwrite cb is called immediately,
      // or on a later tick.  We set this to true at first, because any
      // actions that shouldn't happen until "later" should generally also
      // not happen before the first write call.
      this.sync = true;

      // a flag to know if we're processing previously buffered items, which
      // may call the _write() callback in the same tick, so that we don't
      // end up in an overlapped onwrite situation.
      this.bufferProcessing = false;

      // the callback that's passed to _write(chunk,cb)
      this.onwrite = function(er) {
        onwrite(stream, er);
      };

      // the callback that the user supplies to write(chunk,encoding,cb)
      this.writecb = null;

      // the amount that is being written when _write is called.
      this.writelen = 0;

      this.bufferedRequest = null;
      this.lastBufferedRequest = null;

      // number of pending user-supplied write callbacks
      // this must be 0 before 'finish' can be emitted
      this.pendingcb = 0;

      // emit prefinish if the only thing we're waiting for is _write cbs
      // This is relevant for synchronous Transform streams
      this.prefinished = false;

      // True if the error was already emitted and should not be thrown again
      this.errorEmitted = false;
    }

    WritableState.prototype.getBuffer = function writableStateGetBuffer() {
      var current = this.bufferedRequest;
      var out = [];
      while (current) {
        out.push(current);
        current = current.next;
      }
      return out;
    };

    (function (){try {
    Object.defineProperty(WritableState.prototype, 'buffer', {
      get: internalUtil.deprecate(function() {
        return this.getBuffer();
      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' +
         'instead.')
    });
    }catch(_){}}());

    var Duplex;
    function Writable(options) {
      Duplex = Duplex || require('./_stream_duplex');

      // Writable ctor is applied to Duplexes, though they're not
      // instanceof Writable, they're instanceof Readable.
      if (!(this instanceof Writable) && !(this instanceof Duplex))
        return new Writable(options);

      this._writableState = new WritableState(options, this);

      // legacy.
      this.writable = true;

      if (options) {
        if (typeof options.write === 'function')
          this._write = options.write;

        if (typeof options.writev === 'function')
          this._writev = options.writev;
      }

      Stream.call(this);
    }

    // Otherwise people can pipe Writable streams, which is just wrong.
    Writable.prototype.pipe = function() {
      this.emit('error', new Error('Cannot pipe. Not readable.'));
    };

    function writeAfterEnd(stream, cb) {
      var er = new Error('write after end');
      // TODO: defer error events consistently everywhere, not just the cb
      stream.emit('error', er);
      processNextTick(cb, er);
    }

    // If we get something that is not a buffer, string, null, or undefined,
    // and we're not in objectMode, then that's an error.
    // Otherwise stream chunks are all considered to be of length=1, and the
    // watermarks determine how many objects to keep in the buffer, rather than
    // how many bytes or characters.
    function validChunk(stream, state, chunk, cb) {
      var valid = true;

      if (!(Buffer.isBuffer(chunk)) &&
          typeof chunk !== 'string' &&
          chunk !== null &&
          chunk !== undefined &&
          !state.objectMode) {
        var er = new TypeError('Invalid non-string/buffer chunk');
        stream.emit('error', er);
        processNextTick(cb, er);
        valid = false;
      }
      return valid;
    }

    Writable.prototype.write = function(chunk, encoding, cb) {
      var state = this._writableState;
      var ret = false;

      if (typeof encoding === 'function') {
        cb = encoding;
        encoding = null;
      }

      if (Buffer.isBuffer(chunk))
        encoding = 'buffer';
      else if (!encoding)
        encoding = state.defaultEncoding;

      if (typeof cb !== 'function')
        cb = nop;

      if (state.ended)
        writeAfterEnd(this, cb);
      else if (validChunk(this, state, chunk, cb)) {
        state.pendingcb++;
        ret = writeOrBuffer(this, state, chunk, encoding, cb);
      }

      return ret;
    };

    Writable.prototype.cork = function() {
      var state = this._writableState;

      state.corked++;
    };

    Writable.prototype.uncork = function() {
      var state = this._writableState;

      if (state.corked) {
        state.corked--;

        if (!state.writing &&
            !state.corked &&
            !state.finished &&
            !state.bufferProcessing &&
            state.bufferedRequest)
          clearBuffer(this, state);
      }
    };

    Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
      // node::ParseEncoding() requires lower case.
      if (typeof encoding === 'string')
        encoding = encoding.toLowerCase();
      if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64',
    'ucs2', 'ucs-2','utf16le', 'utf-16le', 'raw']
    .indexOf((encoding + '').toLowerCase()) > -1))
        throw new TypeError('Unknown encoding: ' + encoding);
      this._writableState.defaultEncoding = encoding;
    };

    function decodeChunk(state, chunk, encoding) {
      if (!state.objectMode &&
          state.decodeStrings !== false &&
          typeof chunk === 'string') {
        chunk = new Buffer(chunk, encoding);
      }
      return chunk;
    }

    // if we're already writing something, then just put this
    // in the queue, and wait our turn.  Otherwise, call _write
    // If we return false, then we need a drain event, so set that flag.
    function writeOrBuffer(stream, state, chunk, encoding, cb) {
      chunk = decodeChunk(state, chunk, encoding);

      if (Buffer.isBuffer(chunk))
        encoding = 'buffer';
      var len = state.objectMode ? 1 : chunk.length;

      state.length += len;

      var ret = state.length < state.highWaterMark;
      // we must ensure that previous needDrain will not be reset to false.
      if (!ret)
        state.needDrain = true;

      if (state.writing || state.corked) {
        var last = state.lastBufferedRequest;
        state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
        if (last) {
          last.next = state.lastBufferedRequest;
        } else {
          state.bufferedRequest = state.lastBufferedRequest;
        }
      } else {
        doWrite(stream, state, false, len, chunk, encoding, cb);
      }

      return ret;
    }

    function doWrite(stream, state, writev, len, chunk, encoding, cb) {
      state.writelen = len;
      state.writecb = cb;
      state.writing = true;
      state.sync = true;
      if (writev)
        stream._writev(chunk, state.onwrite);
      else
        stream._write(chunk, encoding, state.onwrite);
      state.sync = false;
    }

    function onwriteError(stream, state, sync, er, cb) {
      --state.pendingcb;
      if (sync)
        processNextTick(cb, er);
      else
        cb(er);

      stream._writableState.errorEmitted = true;
      stream.emit('error', er);
    }

    function onwriteStateUpdate(state) {
      state.writing = false;
      state.writecb = null;
      state.length -= state.writelen;
      state.writelen = 0;
    }

    function onwrite(stream, er) {
      var state = stream._writableState;
      var sync = state.sync;
      var cb = state.writecb;

      onwriteStateUpdate(state);

      if (er)
        onwriteError(stream, state, sync, er, cb);
      else {
        // Check if we're actually ready to finish, but don't emit yet
        var finished = needFinish(state);

        if (!finished &&
            !state.corked &&
            !state.bufferProcessing &&
            state.bufferedRequest) {
          clearBuffer(stream, state);
        }

        if (sync) {
          processNextTick(afterWrite, stream, state, finished, cb);
        } else {
          afterWrite(stream, state, finished, cb);
        }
      }
    }

    function afterWrite(stream, state, finished, cb) {
      if (!finished)
        onwriteDrain(stream, state);
      state.pendingcb--;
      cb();
      finishMaybe(stream, state);
    }

    // Must force callback to be called on nextTick, so that we don't
    // emit 'drain' before the write() consumer gets the 'false' return
    // value, and has a chance to attach a 'drain' listener.
    function onwriteDrain(stream, state) {
      if (state.length === 0 && state.needDrain) {
        state.needDrain = false;
        stream.emit('drain');
      }
    }

    // if there's something in the buffer waiting, then process it
    function clearBuffer(stream, state) {
      state.bufferProcessing = true;
      var entry = state.bufferedRequest;

      if (stream._writev && entry && entry.next) {
        // Fast case, write everything using _writev()
        var buffer = [];
        var cbs = [];
        while (entry) {
          cbs.push(entry.callback);
          buffer.push(entry);
          entry = entry.next;
        }

        // count the one we are adding, as well.
        // TODO(isaacs) clean this up
        state.pendingcb++;
        state.lastBufferedRequest = null;
        doWrite(stream, state, true, state.length, buffer, '', function(err) {
          for (var i = 0; i < cbs.length; i++) {
            state.pendingcb--;
            cbs[i](err);
          }
        });

        // Clear buffer
      } else {
        // Slow case, write chunks one-by-one
        while (entry) {
          var chunk = entry.chunk;
          var encoding = entry.encoding;
          var cb = entry.callback;
          var len = state.objectMode ? 1 : chunk.length;

          doWrite(stream, state, false, len, chunk, encoding, cb);
          entry = entry.next;
          // if we didn't call the onwrite immediately, then
          // it means that we need to wait until it does.
          // also, that means that the chunk and cb are currently
          // being processed, so move the buffer counter past them.
          if (state.writing) {
            break;
          }
        }

        if (entry === null)
          state.lastBufferedRequest = null;
      }
      state.bufferedRequest = entry;
      state.bufferProcessing = false;
    }

    Writable.prototype._write = function(chunk, encoding, cb) {
      cb(new Error('not implemented'));
    };

    Writable.prototype._writev = null;

    Writable.prototype.end = function(chunk, encoding, cb) {
      var state = this._writableState;

      if (typeof chunk === 'function') {
        cb = chunk;
        chunk = null;
        encoding = null;
      } else if (typeof encoding === 'function') {
        cb = encoding;
        encoding = null;
      }

      if (chunk !== null && chunk !== undefined)
        this.write(chunk, encoding);

      // .end() fully uncorks
      if (state.corked) {
        state.corked = 1;
        this.uncork();
      }

      // ignore unnecessary end() calls.
      if (!state.ending && !state.finished)
        endWritable(this, state, cb);
    };

    function needFinish(state) {
      return (state.ending &&
              state.length === 0 &&
              state.bufferedRequest === null &&
              !state.finished &&
              !state.writing);
    }

    function prefinish(stream, state) {
      if (!state.prefinished) {
        state.prefinished = true;
        stream.emit('prefinish');
      }
    }

    function finishMaybe(stream, state) {
      var need = needFinish(state);
      if (need) {
        if (state.pendingcb === 0) {
          prefinish(stream, state);
          state.finished = true;
          stream.emit('finish');
        } else {
          prefinish(stream, state);
        }
      }
      return need;
    }

    function endWritable(stream, state, cb) {
      state.ending = true;
      finishMaybe(stream, state);
      if (cb) {
        if (state.finished)
          processNextTick(cb);
        else
          stream.once('finish', cb);
      }
      state.ended = true;
    }

    },{"./_stream_duplex":48,"buffer":33,"core-util-is":53,"events":37,"inherits":38,"process-nextick-args":54,"util-deprecate":55}],53:[function(require,module,exports){
    (function (Buffer){
    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    // NOTE: These type checking functions intentionally don't use `instanceof`
    // because it is fragile and can be easily faked with `Object.create()`.

    function isArray(arg) {
      if (Array.isArray) {
        return Array.isArray(arg);
      }
      return objectToString(arg) === '[object Array]';
    }
    exports.isArray = isArray;

    function isBoolean(arg) {
      return typeof arg === 'boolean';
    }
    exports.isBoolean = isBoolean;

    function isNull(arg) {
      return arg === null;
    }
    exports.isNull = isNull;

    function isNullOrUndefined(arg) {
      return arg == null;
    }
    exports.isNullOrUndefined = isNullOrUndefined;

    function isNumber(arg) {
      return typeof arg === 'number';
    }
    exports.isNumber = isNumber;

    function isString(arg) {
      return typeof arg === 'string';
    }
    exports.isString = isString;

    function isSymbol(arg) {
      return typeof arg === 'symbol';
    }
    exports.isSymbol = isSymbol;

    function isUndefined(arg) {
      return arg === void 0;
    }
    exports.isUndefined = isUndefined;

    function isRegExp(re) {
      return objectToString(re) === '[object RegExp]';
    }
    exports.isRegExp = isRegExp;

    function isObject(arg) {
      return typeof arg === 'object' && arg !== null;
    }
    exports.isObject = isObject;

    function isDate(d) {
      return objectToString(d) === '[object Date]';
    }
    exports.isDate = isDate;

    function isError(e) {
      return (objectToString(e) === '[object Error]' || e instanceof Error);
    }
    exports.isError = isError;

    function isFunction(arg) {
      return typeof arg === 'function';
    }
    exports.isFunction = isFunction;

    function isPrimitive(arg) {
      return arg === null ||
             typeof arg === 'boolean' ||
             typeof arg === 'number' ||
             typeof arg === 'string' ||
             typeof arg === 'symbol' ||  // ES6 symbol
             typeof arg === 'undefined';
    }
    exports.isPrimitive = isPrimitive;

    exports.isBuffer = Buffer.isBuffer;

    function objectToString(o) {
      return Object.prototype.toString.call(o);
    }

    }).call(this,{"isBuffer":require("../../../../insert-module-globals/node_modules/is-buffer/index.js")})
    },{"../../../../insert-module-globals/node_modules/is-buffer/index.js":39}],54:[function(require,module,exports){
    (function (process){
    'use strict';

    if (!process.version ||
        process.version.indexOf('v0.') === 0 ||
        process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
      module.exports = nextTick;
    } else {
      module.exports = process.nextTick;
    }

    function nextTick(fn) {
      var args = new Array(arguments.length - 1);
      var i = 0;
      while (i < args.length) {
        args[i++] = arguments[i];
      }
      process.nextTick(function afterTick() {
        fn.apply(null, args);
      });
    }

    }).call(this,require('_process'))
    },{"_process":42}],55:[function(require,module,exports){
    (function (global){

    /**
     * Module exports.
     */

    module.exports = deprecate;

    /**
     * Mark that a method should not be used.
     * Returns a modified function which warns once by default.
     *
     * If `localStorage.noDeprecation = true` is set, then it is a no-op.
     *
     * If `localStorage.throwDeprecation = true` is set, then deprecated functions
     * will throw an Error when invoked.
     *
     * If `localStorage.traceDeprecation = true` is set, then deprecated functions
     * will invoke `console.trace()` instead of `console.error()`.
     *
     * @param {Function} fn - the function to deprecate
     * @param {String} msg - the string to print to the console when `fn` is invoked
     * @returns {Function} a new "deprecated" version of `fn`
     * @api public
     */

    function deprecate (fn, msg) {
      if (config('noDeprecation')) {
        return fn;
      }

      var warned = false;
      function deprecated() {
        if (!warned) {
          if (config('throwDeprecation')) {
            throw new Error(msg);
          } else if (config('traceDeprecation')) {
            console.trace(msg);
          } else {
            console.warn(msg);
          }
          warned = true;
        }
        return fn.apply(this, arguments);
      }

      return deprecated;
    }

    /**
     * Checks `localStorage` for boolean values for the given `name`.
     *
     * @param {String} name
     * @returns {Boolean}
     * @api private
     */

    function config (name) {
      // accessing global.localStorage can trigger a DOMException in sandboxed iframes
      try {
        if (!global.localStorage) return false;
      } catch (_) {
        return false;
      }
      var val = global.localStorage[name];
      if (null == val) return false;
      return String(val).toLowerCase() === 'true';
    }

    }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{}],56:[function(require,module,exports){
    module.exports = require("./lib/_stream_passthrough.js")

    },{"./lib/_stream_passthrough.js":49}],57:[function(require,module,exports){
    var Stream = (function (){
      try {
        return require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
      } catch(_){}
    }());
    exports = module.exports = require('./lib/_stream_readable.js');
    exports.Stream = Stream || exports;
    exports.Readable = exports;
    exports.Writable = require('./lib/_stream_writable.js');
    exports.Duplex = require('./lib/_stream_duplex.js');
    exports.Transform = require('./lib/_stream_transform.js');
    exports.PassThrough = require('./lib/_stream_passthrough.js');

    },{"./lib/_stream_duplex.js":48,"./lib/_stream_passthrough.js":49,"./lib/_stream_readable.js":50,"./lib/_stream_transform.js":51,"./lib/_stream_writable.js":52}],58:[function(require,module,exports){
    module.exports = require("./lib/_stream_transform.js")

    },{"./lib/_stream_transform.js":51}],59:[function(require,module,exports){
    module.exports = require("./lib/_stream_writable.js")

    },{"./lib/_stream_writable.js":52}],60:[function(require,module,exports){
    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    module.exports = Stream;

    var EE = require('events').EventEmitter;
    var inherits = require('inherits');

    inherits(Stream, EE);
    Stream.Readable = require('readable-stream/readable.js');
    Stream.Writable = require('readable-stream/writable.js');
    Stream.Duplex = require('readable-stream/duplex.js');
    Stream.Transform = require('readable-stream/transform.js');
    Stream.PassThrough = require('readable-stream/passthrough.js');

    // Backwards-compat with node 0.4.x
    Stream.Stream = Stream;

    // old-style streams.  Note that the pipe method (the only relevant
    // part of this class) is overridden in the Readable class.

    function Stream() {
      EE.call(this);
    }

    Stream.prototype.pipe = function(dest, options) {
      var source = this;

      function ondata(chunk) {
        if (dest.writable) {
          if (false === dest.write(chunk) && source.pause) {
            source.pause();
          }
        }
      }

      source.on('data', ondata);

      function ondrain() {
        if (source.readable && source.resume) {
          source.resume();
        }
      }

      dest.on('drain', ondrain);

      // If the 'end' option is not supplied, dest.end() will be called when
      // source gets the 'end' or 'close' events.  Only dest.end() once.
      if (!dest._isStdio && (!options || options.end !== false)) {
        source.on('end', onend);
        source.on('close', onclose);
      }

      var didOnEnd = false;
      function onend() {
        if (didOnEnd) return;
        didOnEnd = true;

        dest.end();
      }

      function onclose() {
        if (didOnEnd) return;
        didOnEnd = true;

        if (typeof dest.destroy === 'function') dest.destroy();
      }

      // don't leave dangling pipes when there are errors.
      function onerror(er) {
        cleanup();
        if (EE.listenerCount(this, 'error') === 0) {
          throw er; // Unhandled stream error in pipe.
        }
      }

      source.on('error', onerror);
      dest.on('error', onerror);

      // remove all the event listeners that were added.
      function cleanup() {
        source.removeListener('data', ondata);
        dest.removeListener('drain', ondrain);

        source.removeListener('end', onend);
        source.removeListener('close', onclose);

        source.removeListener('error', onerror);
        dest.removeListener('error', onerror);

        source.removeListener('end', cleanup);
        source.removeListener('close', cleanup);

        dest.removeListener('close', cleanup);
      }

      source.on('end', cleanup);
      source.on('close', cleanup);

      dest.on('close', cleanup);

      dest.emit('pipe', source);

      // Allow for unix-like usage: A.pipe(B).pipe(C)
      return dest;
    };

    },{"events":37,"inherits":38,"readable-stream/duplex.js":47,"readable-stream/passthrough.js":56,"readable-stream/readable.js":57,"readable-stream/transform.js":58,"readable-stream/writable.js":59}],61:[function(require,module,exports){
    var ClientRequest = require('./lib/request')
    var extend = require('xtend')
    var statusCodes = require('builtin-status-codes')
    var url = require('url')

    var http = exports

    http.request = function (opts, cb) {
    	if (typeof opts === 'string')
    		opts = url.parse(opts)
    	else
    		opts = extend(opts)

    	var protocol = opts.protocol || ''
    	var host = opts.hostname || opts.host
    	var port = opts.port
    	var path = opts.path || '/'

    	// Necessary for IPv6 addresses
    	if (host && host.indexOf(':') !== -1)
    		host = '[' + host + ']'

    	// This may be a relative url. The browser should always be able to interpret it correctly.
    	opts.url = (host ? (protocol + '//' + host) : '') + (port ? ':' + port : '') + path
    	opts.method = (opts.method || 'GET').toUpperCase()
    	opts.headers = opts.headers || {}

    	// Also valid opts.auth, opts.mode

    	var req = new ClientRequest(opts)
    	if (cb)
    		req.on('response', cb)
    	return req
    }

    http.get = function get (opts, cb) {
    	var req = http.request(opts, cb)
    	req.end()
    	return req
    }

    http.Agent = function () {}
    http.Agent.defaultMaxSockets = 4

    http.STATUS_CODES = statusCodes

    http.METHODS = [
    	'CHECKOUT',
    	'CONNECT',
    	'COPY',
    	'DELETE',
    	'GET',
    	'HEAD',
    	'LOCK',
    	'M-SEARCH',
    	'MERGE',
    	'MKACTIVITY',
    	'MKCOL',
    	'MOVE',
    	'NOTIFY',
    	'OPTIONS',
    	'PATCH',
    	'POST',
    	'PROPFIND',
    	'PROPPATCH',
    	'PURGE',
    	'PUT',
    	'REPORT',
    	'SEARCH',
    	'SUBSCRIBE',
    	'TRACE',
    	'UNLOCK',
    	'UNSUBSCRIBE'
    ]
    },{"./lib/request":63,"builtin-status-codes":65,"url":71,"xtend":74}],62:[function(require,module,exports){
    (function (global){
    exports.fetch = isFunction(global.fetch) && isFunction(global.ReadableByteStream)

    exports.blobConstructor = false
    try {
    	new Blob([new ArrayBuffer(1)])
    	exports.blobConstructor = true
    } catch (e) {}

    var xhr = new global.XMLHttpRequest()
    // If location.host is empty, e.g. if this page/worker was loaded
    // from a Blob, then use example.com to avoid an error
    xhr.open('GET', global.location.host ? '/' : 'https://example.com')

    function checkTypeSupport (type) {
    	try {
    		xhr.responseType = type
    		return xhr.responseType === type
    	} catch (e) {}
    	return false
    }

    // For some strange reason, Safari 7.0 reports typeof global.ArrayBuffer === 'object'.
    // Safari 7.1 appears to have fixed this bug.
    var haveArrayBuffer = typeof global.ArrayBuffer !== 'undefined'
    var haveSlice = haveArrayBuffer && isFunction(global.ArrayBuffer.prototype.slice)

    exports.arraybuffer = haveArrayBuffer && checkTypeSupport('arraybuffer')
    // These next two tests unavoidably show warnings in Chrome. Since fetch will always
    // be used if it's available, just return false for these to avoid the warnings.
    exports.msstream = !exports.fetch && haveSlice && checkTypeSupport('ms-stream')
    exports.mozchunkedarraybuffer = !exports.fetch && haveArrayBuffer &&
    	checkTypeSupport('moz-chunked-arraybuffer')
    exports.overrideMimeType = isFunction(xhr.overrideMimeType)
    exports.vbArray = isFunction(global.VBArray)

    function isFunction (value) {
      return typeof value === 'function'
    }

    xhr = null // Help gc

    }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{}],63:[function(require,module,exports){
    (function (process,global,Buffer){
    // var Base64 = require('Base64')
    var capability = require('./capability')
    var foreach = require('foreach')
    var indexOf = require('indexof')
    var inherits = require('inherits')
    var keys = require('object-keys')
    var response = require('./response')
    var stream = require('stream')

    var IncomingMessage = response.IncomingMessage
    var rStates = response.readyStates

    function decideMode (preferBinary) {
    	if (capability.fetch) {
    		return 'fetch'
    	} else if (capability.mozchunkedarraybuffer) {
    		return 'moz-chunked-arraybuffer'
    	} else if (capability.msstream) {
    		return 'ms-stream'
    	} else if (capability.arraybuffer && preferBinary) {
    		return 'arraybuffer'
    	} else if (capability.vbArray && preferBinary) {
    		return 'text:vbarray'
    	} else {
    		return 'text'
    	}
    }

    var ClientRequest = module.exports = function (opts) {
    	var self = this
    	stream.Writable.call(self)

    	self._opts = opts
    	self._body = []
    	self._headers = {}
    	if (opts.auth)
    		self.setHeader('Authorization', 'Basic ' + new Buffer(opts.auth).toString('base64'))
    	foreach(keys(opts.headers), function (name) {
    		self.setHeader(name, opts.headers[name])
    	})

    	var preferBinary
    	if (opts.mode === 'prefer-streaming') {
    		// If streaming is a high priority but binary compatibility and
    		// the accuracy of the 'content-type' header aren't
    		preferBinary = false
    	} else if (opts.mode === 'allow-wrong-content-type') {
    		// If streaming is more important than preserving the 'content-type' header
    		preferBinary = !capability.overrideMimeType
    	} else if (!opts.mode || opts.mode === 'default' || opts.mode === 'prefer-fast') {
    		// Use binary if text streaming may corrupt data or the content-type header, or for speed
    		preferBinary = true
    	} else {
    		throw new Error('Invalid value for opts.mode')
    	}
    	self._mode = decideMode(preferBinary)

    	self.on('finish', function () {
    		self._onFinish()
    	})
    }

    inherits(ClientRequest, stream.Writable)

    ClientRequest.prototype.setHeader = function (name, value) {
    	var self = this
    	var lowerName = name.toLowerCase()
    	// This check is not necessary, but it prevents warnings from browsers about setting unsafe
    	// headers. To be honest I'm not entirely sure hiding these warnings is a good thing, but
    	// http-browserify did it, so I will too.
    	if (indexOf(unsafeHeaders, lowerName) !== -1)
    		return

    	self._headers[lowerName] = {
    		name: name,
    		value: value
    	}
    }

    ClientRequest.prototype.getHeader = function (name) {
    	var self = this
    	return self._headers[name.toLowerCase()].value
    }

    ClientRequest.prototype.removeHeader = function (name) {
    	var self = this
    	delete self._headers[name.toLowerCase()]
    }

    ClientRequest.prototype._onFinish = function () {
    	var self = this

    	if (self._destroyed)
    		return
    	var opts = self._opts

    	var headersObj = self._headers
    	var body
    	if (opts.method === 'POST' || opts.method === 'PUT') {
    		if (capability.blobConstructor) {
    			body = new global.Blob(self._body.map(function (buffer) {
    				return buffer.toArrayBuffer()
    			}), {
    				type: (headersObj['content-type'] || {}).value || ''
    			})
    		} else {
    			// get utf8 string
    			body = Buffer.concat(self._body).toString()
    		}
    	}

    	if (self._mode === 'fetch') {
    		var headers = keys(headersObj).map(function (name) {
    			return [headersObj[name].name, headersObj[name].value]
    		})

    		global.fetch(self._opts.url, {
    			method: self._opts.method,
    			headers: headers,
    			body: body,
    			mode: 'cors',
    			credentials: opts.withCredentials ? 'include' : 'same-origin'
    		}).then(function (response) {
    			self._fetchResponse = response
    			self._connect()
    		}).then(undefined, function (reason) {
    			self.emit('error', reason)
    		})
    	} else {
    		var xhr = self._xhr = new global.XMLHttpRequest()
    		try {
    			xhr.open(self._opts.method, self._opts.url, true)
    		} catch (err) {
    			process.nextTick(function () {
    				self.emit('error', err)
    			})
    			return
    		}

    		// Can't set responseType on really old browsers
    		if ('responseType' in xhr)
    			xhr.responseType = self._mode.split(':')[0]

    		if ('withCredentials' in xhr)
    			xhr.withCredentials = !!opts.withCredentials

    		if (self._mode === 'text' && 'overrideMimeType' in xhr)
    			xhr.overrideMimeType('text/plain; charset=x-user-defined')

    		foreach(keys(headersObj), function (name) {
    			xhr.setRequestHeader(headersObj[name].name, headersObj[name].value)
    		})

    		self._response = null
    		xhr.onreadystatechange = function () {
    			switch (xhr.readyState) {
    				case rStates.LOADING:
    				case rStates.DONE:
    					self._onXHRProgress()
    					break
    			}
    		}
    		// Necessary for streaming in Firefox, since xhr.response is ONLY defined
    		// in onprogress, not in onreadystatechange with xhr.readyState = 3
    		if (self._mode === 'moz-chunked-arraybuffer') {
    			xhr.onprogress = function () {
    				self._onXHRProgress()
    			}
    		}

    		xhr.onerror = function () {
    			if (self._destroyed)
    				return
    			self.emit('error', new Error('XHR error'))
    		}

    		try {
    			xhr.send(body)
    		} catch (err) {
    			process.nextTick(function () {
    				self.emit('error', err)
    			})
    			return
    		}
    	}
    }

    /**
     * Checks if xhr.status is readable. Even though the spec says it should
     * be available in readyState 3, accessing it throws an exception in IE8
     */
    function statusValid (xhr) {
    	try {
    		return (xhr.status !== null)
    	} catch (e) {
    		return false
    	}
    }

    ClientRequest.prototype._onXHRProgress = function () {
    	var self = this

    	if (!statusValid(self._xhr) || self._destroyed)
    		return

    	if (!self._response)
    		self._connect()

    	self._response._onXHRProgress()
    }

    ClientRequest.prototype._connect = function () {
    	var self = this

    	if (self._destroyed)
    		return

    	self._response = new IncomingMessage(self._xhr, self._fetchResponse, self._mode)
    	self.emit('response', self._response)
    }

    ClientRequest.prototype._write = function (chunk, encoding, cb) {
    	var self = this

    	self._body.push(chunk)
    	cb()
    }

    ClientRequest.prototype.abort = ClientRequest.prototype.destroy = function () {
    	var self = this
    	self._destroyed = true
    	if (self._response)
    		self._response._destroyed = true
    	if (self._xhr)
    		self._xhr.abort()
    	// Currently, there isn't a way to truly abort a fetch.
    	// If you like bikeshedding, see https://github.com/whatwg/fetch/issues/27
    }

    ClientRequest.prototype.end = function (data, encoding, cb) {
    	var self = this
    	if (typeof data === 'function') {
    		cb = data
    		data = undefined
    	}

    	stream.Writable.prototype.end.call(self, data, encoding, cb)
    }

    ClientRequest.prototype.flushHeaders = function () {}
    ClientRequest.prototype.setTimeout = function () {}
    ClientRequest.prototype.setNoDelay = function () {}
    ClientRequest.prototype.setSocketKeepAlive = function () {}

    // Taken from http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader%28%29-method
    var unsafeHeaders = [
    	'accept-charset',
    	'accept-encoding',
    	'access-control-request-headers',
    	'access-control-request-method',
    	'connection',
    	'content-length',
    	'cookie',
    	'cookie2',
    	'date',
    	'dnt',
    	'expect',
    	'host',
    	'keep-alive',
    	'origin',
    	'referer',
    	'te',
    	'trailer',
    	'transfer-encoding',
    	'upgrade',
    	'user-agent',
    	'via'
    ]

    }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)
    },{"./capability":62,"./response":64,"_process":42,"buffer":33,"foreach":66,"indexof":67,"inherits":38,"object-keys":68,"stream":60}],64:[function(require,module,exports){
    (function (process,global,Buffer){
    var capability = require('./capability')
    var foreach = require('foreach')
    var inherits = require('inherits')
    var stream = require('stream')

    var rStates = exports.readyStates = {
    	UNSENT: 0,
    	OPENED: 1,
    	HEADERS_RECEIVED: 2,
    	LOADING: 3,
    	DONE: 4
    }

    var IncomingMessage = exports.IncomingMessage = function (xhr, response, mode) {
    	var self = this
    	stream.Readable.call(self)

    	self._mode = mode
    	self.headers = {}
    	self.rawHeaders = []
    	self.trailers = {}
    	self.rawTrailers = []

    	// Fake the 'close' event, but only once 'end' fires
    	self.on('end', function () {
    		// The nextTick is necessary to prevent the 'request' module from causing an infinite loop
    		process.nextTick(function () {
    			self.emit('close')
    		})
    	})

    	if (mode === 'fetch') {
    		self._fetchResponse = response

    		self.statusCode = response.status
    		self.statusMessage = response.statusText
    		// backwards compatible version of for (<item> of <iterable>):
    		// for (var <item>,_i,_it = <iterable>[Symbol.iterator](); <item> = (_i = _it.next()).value,!_i.done;)
    		for (var header, _i, _it = response.headers[Symbol.iterator](); header = (_i = _it.next()).value, !_i.done;) {
    			self.headers[header[0].toLowerCase()] = header[1]
    			self.rawHeaders.push(header[0], header[1])
    		}

    		// TODO: this doesn't respect backpressure. Once WritableStream is available, this can be fixed
    		var reader = response.body.getReader()
    		function read () {
    			reader.read().then(function (result) {
    				if (self._destroyed)
    					return
    				if (result.done) {
    					self.push(null)
    					return
    				}
    				self.push(new Buffer(result.value))
    				read()
    			})
    		}
    		read()

    	} else {
    		self._xhr = xhr
    		self._pos = 0

    		self.statusCode = xhr.status
    		self.statusMessage = xhr.statusText
    		var headers = xhr.getAllResponseHeaders().split(/\r?\n/)
    		foreach(headers, function (header) {
    			var matches = header.match(/^([^:]+):\s*(.*)/)
    			if (matches) {
    				var key = matches[1].toLowerCase()
    				if (self.headers[key] !== undefined)
    					self.headers[key] += ', ' + matches[2]
    				else
    					self.headers[key] = matches[2]
    				self.rawHeaders.push(matches[1], matches[2])
    			}
    		})

    		self._charset = 'x-user-defined'
    		if (!capability.overrideMimeType) {
    			var mimeType = self.rawHeaders['mime-type']
    			if (mimeType) {
    				var charsetMatch = mimeType.match(/;\s*charset=([^;])(;|$)/)
    				if (charsetMatch) {
    					self._charset = charsetMatch[1].toLowerCase()
    				}
    			}
    			if (!self._charset)
    				self._charset = 'utf-8' // best guess
    		}
    	}
    }

    inherits(IncomingMessage, stream.Readable)

    IncomingMessage.prototype._read = function () {}

    IncomingMessage.prototype._onXHRProgress = function () {
    	var self = this

    	var xhr = self._xhr

    	var response = null
    	switch (self._mode) {
    		case 'text:vbarray': // For IE9
    			if (xhr.readyState !== rStates.DONE)
    				break
    			try {
    				// This fails in IE8
    				response = new global.VBArray(xhr.responseBody).toArray()
    			} catch (e) {}
    			if (response !== null) {
    				self.push(new Buffer(response))
    				break
    			}
    			// Falls through in IE8
    		case 'text':
    			try { // This will fail when readyState = 3 in IE9. Switch mode and wait for readyState = 4
    				response = xhr.responseText
    			} catch (e) {
    				self._mode = 'text:vbarray'
    				break
    			}
    			if (response.length > self._pos) {
    				var newData = response.substr(self._pos)
    				if (self._charset === 'x-user-defined') {
    					var buffer = new Buffer(newData.length)
    					for (var i = 0; i < newData.length; i++)
    						buffer[i] = newData.charCodeAt(i) & 0xff

    					self.push(buffer)
    				} else {
    					self.push(newData, self._charset)
    				}
    				self._pos = response.length
    			}
    			break
    		case 'arraybuffer':
    			if (xhr.readyState !== rStates.DONE)
    				break
    			response = xhr.response
    			self.push(new Buffer(new Uint8Array(response)))
    			break
    		case 'moz-chunked-arraybuffer': // take whole
    			response = xhr.response
    			if (xhr.readyState !== rStates.LOADING || !response)
    				break
    			self.push(new Buffer(new Uint8Array(response)))
    			break
    		case 'ms-stream':
    			response = xhr.response
    			if (xhr.readyState !== rStates.LOADING)
    				break
    			var reader = new global.MSStreamReader()
    			reader.onprogress = function () {
    				if (reader.result.byteLength > self._pos) {
    					self.push(new Buffer(new Uint8Array(reader.result.slice(self._pos))))
    					self._pos = reader.result.byteLength
    				}
    			}
    			reader.onload = function () {
    				self.push(null)
    			}
    			// reader.onerror = ??? // TODO: this
    			reader.readAsArrayBuffer(response)
    			break
    	}

    	// The ms-stream case handles end separately in reader.onload()
    	if (self._xhr.readyState === rStates.DONE && self._mode !== 'ms-stream') {
    		self.push(null)
    	}
    }

    }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)
    },{"./capability":62,"_process":42,"buffer":33,"foreach":66,"inherits":38,"stream":60}],65:[function(require,module,exports){
    module.exports = {
      "100": "Continue",
      "101": "Switching Protocols",
      "102": "Processing",
      "200": "OK",
      "201": "Created",
      "202": "Accepted",
      "203": "Non-Authoritative Information",
      "204": "No Content",
      "205": "Reset Content",
      "206": "Partial Content",
      "207": "Multi-Status",
      "300": "Multiple Choices",
      "301": "Moved Permanently",
      "302": "Moved Temporarily",
      "303": "See Other",
      "304": "Not Modified",
      "305": "Use Proxy",
      "307": "Temporary Redirect",
      "308": "Permanent Redirect",
      "400": "Bad Request",
      "401": "Unauthorized",
      "402": "Payment Required",
      "403": "Forbidden",
      "404": "Not Found",
      "405": "Method Not Allowed",
      "406": "Not Acceptable",
      "407": "Proxy Authentication Required",
      "408": "Request Time-out",
      "409": "Conflict",
      "410": "Gone",
      "411": "Length Required",
      "412": "Precondition Failed",
      "413": "Request Entity Too Large",
      "414": "Request-URI Too Large",
      "415": "Unsupported Media Type",
      "416": "Requested Range Not Satisfiable",
      "417": "Expectation Failed",
      "418": "I'm a teapot",
      "422": "Unprocessable Entity",
      "423": "Locked",
      "424": "Failed Dependency",
      "425": "Unordered Collection",
      "426": "Upgrade Required",
      "428": "Precondition Required",
      "429": "Too Many Requests",
      "431": "Request Header Fields Too Large",
      "500": "Internal Server Error",
      "501": "Not Implemented",
      "502": "Bad Gateway",
      "503": "Service Unavailable",
      "504": "Gateway Time-out",
      "505": "HTTP Version Not Supported",
      "506": "Variant Also Negotiates",
      "507": "Insufficient Storage",
      "509": "Bandwidth Limit Exceeded",
      "510": "Not Extended",
      "511": "Network Authentication Required"
    }

    },{}],66:[function(require,module,exports){

    var hasOwn = Object.prototype.hasOwnProperty;
    var toString = Object.prototype.toString;

    module.exports = function forEach (obj, fn, ctx) {
        if (toString.call(fn) !== '[object Function]') {
            throw new TypeError('iterator must be a function');
        }
        var l = obj.length;
        if (l === +l) {
            for (var i = 0; i < l; i++) {
                fn.call(ctx, obj[i], i, obj);
            }
        } else {
            for (var k in obj) {
                if (hasOwn.call(obj, k)) {
                    fn.call(ctx, obj[k], k, obj);
                }
            }
        }
    };

    },{}],67:[function(require,module,exports){

    var indexOf = [].indexOf;

    module.exports = function(arr, obj){
      if (indexOf) return arr.indexOf(obj);
      for (var i = 0; i < arr.length; ++i) {
        if (arr[i] === obj) return i;
      }
      return -1;
    };
    },{}],68:[function(require,module,exports){
    'use strict';

    // modified from https://github.com/es-shims/es5-shim
    var has = Object.prototype.hasOwnProperty;
    var toStr = Object.prototype.toString;
    var slice = Array.prototype.slice;
    var isArgs = require('./isArguments');
    var hasDontEnumBug = !({ toString: null }).propertyIsEnumerable('toString');
    var hasProtoEnumBug = function () {}.propertyIsEnumerable('prototype');
    var dontEnums = [
    	'toString',
    	'toLocaleString',
    	'valueOf',
    	'hasOwnProperty',
    	'isPrototypeOf',
    	'propertyIsEnumerable',
    	'constructor'
    ];
    var equalsConstructorPrototype = function (o) {
    	var ctor = o.constructor;
    	return ctor && ctor.prototype === o;
    };
    var blacklistedKeys = {
    	$console: true,
    	$frame: true,
    	$frameElement: true,
    	$frames: true,
    	$parent: true,
    	$self: true,
    	$webkitIndexedDB: true,
    	$webkitStorageInfo: true,
    	$window: true
    };
    var hasAutomationEqualityBug = (function () {
    	/* global window */
    	if (typeof window === 'undefined') { return false; }
    	for (var k in window) {
    		try {
    			if (!blacklistedKeys['$' + k] && has.call(window, k) && window[k] !== null && typeof window[k] === 'object') {
    				try {
    					equalsConstructorPrototype(window[k]);
    				} catch (e) {
    					return true;
    				}
    			}
    		} catch (e) {
    			return true;
    		}
    	}
    	return false;
    }());
    var equalsConstructorPrototypeIfNotBuggy = function (o) {
    	/* global window */
    	if (typeof window === 'undefined' || !hasAutomationEqualityBug) {
    		return equalsConstructorPrototype(o);
    	}
    	try {
    		return equalsConstructorPrototype(o);
    	} catch (e) {
    		return false;
    	}
    };

    var keysShim = function keys(object) {
    	var isObject = object !== null && typeof object === 'object';
    	var isFunction = toStr.call(object) === '[object Function]';
    	var isArguments = isArgs(object);
    	var isString = isObject && toStr.call(object) === '[object String]';
    	var theKeys = [];

    	if (!isObject && !isFunction && !isArguments) {
    		throw new TypeError('Object.keys called on a non-object');
    	}

    	var skipProto = hasProtoEnumBug && isFunction;
    	if (isString && object.length > 0 && !has.call(object, 0)) {
    		for (var i = 0; i < object.length; ++i) {
    			theKeys.push(String(i));
    		}
    	}

    	if (isArguments && object.length > 0) {
    		for (var j = 0; j < object.length; ++j) {
    			theKeys.push(String(j));
    		}
    	} else {
    		for (var name in object) {
    			if (!(skipProto && name === 'prototype') && has.call(object, name)) {
    				theKeys.push(String(name));
    			}
    		}
    	}

    	if (hasDontEnumBug) {
    		var skipConstructor = equalsConstructorPrototypeIfNotBuggy(object);

    		for (var k = 0; k < dontEnums.length; ++k) {
    			if (!(skipConstructor && dontEnums[k] === 'constructor') && has.call(object, dontEnums[k])) {
    				theKeys.push(dontEnums[k]);
    			}
    		}
    	}
    	return theKeys;
    };

    keysShim.shim = function shimObjectKeys() {
    	if (Object.keys) {
    		var keysWorksWithArguments = (function () {
    			// Safari 5.0 bug
    			return (Object.keys(arguments) || '').length === 2;
    		}(1, 2));
    		if (!keysWorksWithArguments) {
    			var originalKeys = Object.keys;
    			Object.keys = function keys(object) {
    				if (isArgs(object)) {
    					return originalKeys(slice.call(object));
    				} else {
    					return originalKeys(object);
    				}
    			};
    		}
    	} else {
    		Object.keys = keysShim;
    	}
    	return Object.keys || keysShim;
    };

    module.exports = keysShim;

    },{"./isArguments":69}],69:[function(require,module,exports){
    'use strict';

    var toStr = Object.prototype.toString;

    module.exports = function isArguments(value) {
    	var str = toStr.call(value);
    	var isArgs = str === '[object Arguments]';
    	if (!isArgs) {
    		isArgs = str !== '[object Array]' &&
    			value !== null &&
    			typeof value === 'object' &&
    			typeof value.length === 'number' &&
    			value.length >= 0 &&
    			toStr.call(value.callee) === '[object Function]';
    	}
    	return isArgs;
    };

    },{}],70:[function(require,module,exports){
    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    var Buffer = require('buffer').Buffer;

    var isBufferEncoding = Buffer.isEncoding
      || function(encoding) {
           switch (encoding && encoding.toLowerCase()) {
             case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;
             default: return false;
           }
         }

    function assertEncoding(encoding) {
      if (encoding && !isBufferEncoding(encoding)) {
        throw new Error('Unknown encoding: ' + encoding);
      }
    }

    // StringDecoder provides an interface for efficiently splitting a series of
    // buffers into a series of JS strings without breaking apart multi-byte
    // characters. CESU-8 is handled as part of the UTF-8 encoding.
    //
    // @TODO Handling all encodings inside a single object makes it very difficult
    // to reason about this code, so it should be split up in the future.
    // @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code
    // points as used by CESU-8.
    var StringDecoder = exports.StringDecoder = function(encoding) {
      this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');
      assertEncoding(encoding);
      switch (this.encoding) {
        case 'utf8':
          // CESU-8 represents each of Surrogate Pair by 3-bytes
          this.surrogateSize = 3;
          break;
        case 'ucs2':
        case 'utf16le':
          // UTF-16 represents each of Surrogate Pair by 2-bytes
          this.surrogateSize = 2;
          this.detectIncompleteChar = utf16DetectIncompleteChar;
          break;
        case 'base64':
          // Base-64 stores 3 bytes in 4 chars, and pads the remainder.
          this.surrogateSize = 3;
          this.detectIncompleteChar = base64DetectIncompleteChar;
          break;
        default:
          this.write = passThroughWrite;
          return;
      }

      // Enough space to store all bytes of a single character. UTF-8 needs 4
      // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).
      this.charBuffer = new Buffer(6);
      // Number of bytes received for the current incomplete multi-byte character.
      this.charReceived = 0;
      // Number of bytes expected for the current incomplete multi-byte character.
      this.charLength = 0;
    };

    // write decodes the given buffer and returns it as JS string that is
    // guaranteed to not contain any partial multi-byte characters. Any partial
    // character found at the end of the buffer is buffered up, and will be
    // returned when calling write again with the remaining bytes.
    //
    // Note: Converting a Buffer containing an orphan surrogate to a String
    // currently works, but converting a String to a Buffer (via `new Buffer`, or
    // Buffer#write) will replace incomplete surrogates with the unicode
    // replacement character. See https://codereview.chromium.org/121173009/ .
    StringDecoder.prototype.write = function(buffer) {
      var charStr = '';
      // if our last write ended with an incomplete multibyte character
      while (this.charLength) {
        // determine how many remaining bytes this buffer has to offer for this char
        var available = (buffer.length >= this.charLength - this.charReceived) ?
            this.charLength - this.charReceived :
            buffer.length;

        // add the new bytes to the char buffer
        buffer.copy(this.charBuffer, this.charReceived, 0, available);
        this.charReceived += available;

        if (this.charReceived < this.charLength) {
          // still not enough chars in this buffer? wait for more ...
          return '';
        }

        // remove bytes belonging to the current character from the buffer
        buffer = buffer.slice(available, buffer.length);

        // get the character that was split
        charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);

        // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
        var charCode = charStr.charCodeAt(charStr.length - 1);
        if (charCode >= 0xD800 && charCode <= 0xDBFF) {
          this.charLength += this.surrogateSize;
          charStr = '';
          continue;
        }
        this.charReceived = this.charLength = 0;

        // if there are no more bytes in this buffer, just emit our char
        if (buffer.length === 0) {
          return charStr;
        }
        break;
      }

      // determine and set charLength / charReceived
      this.detectIncompleteChar(buffer);

      var end = buffer.length;
      if (this.charLength) {
        // buffer the incomplete character bytes we got
        buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);
        end -= this.charReceived;
      }

      charStr += buffer.toString(this.encoding, 0, end);

      var end = charStr.length - 1;
      var charCode = charStr.charCodeAt(end);
      // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
      if (charCode >= 0xD800 && charCode <= 0xDBFF) {
        var size = this.surrogateSize;
        this.charLength += size;
        this.charReceived += size;
        this.charBuffer.copy(this.charBuffer, size, 0, size);
        buffer.copy(this.charBuffer, 0, 0, size);
        return charStr.substring(0, end);
      }

      // or just emit the charStr
      return charStr;
    };

    // detectIncompleteChar determines if there is an incomplete UTF-8 character at
    // the end of the given buffer. If so, it sets this.charLength to the byte
    // length that character, and sets this.charReceived to the number of bytes
    // that are available for this character.
    StringDecoder.prototype.detectIncompleteChar = function(buffer) {
      // determine how many bytes we have to check at the end of this buffer
      var i = (buffer.length >= 3) ? 3 : buffer.length;

      // Figure out if one of the last i bytes of our buffer announces an
      // incomplete char.
      for (; i > 0; i--) {
        var c = buffer[buffer.length - i];

        // See http://en.wikipedia.org/wiki/UTF-8#Description

        // 110XXXXX
        if (i == 1 && c >> 5 == 0x06) {
          this.charLength = 2;
          break;
        }

        // 1110XXXX
        if (i <= 2 && c >> 4 == 0x0E) {
          this.charLength = 3;
          break;
        }

        // 11110XXX
        if (i <= 3 && c >> 3 == 0x1E) {
          this.charLength = 4;
          break;
        }
      }
      this.charReceived = i;
    };

    StringDecoder.prototype.end = function(buffer) {
      var res = '';
      if (buffer && buffer.length)
        res = this.write(buffer);

      if (this.charReceived) {
        var cr = this.charReceived;
        var buf = this.charBuffer;
        var enc = this.encoding;
        res += buf.slice(0, cr).toString(enc);
      }

      return res;
    };

    function passThroughWrite(buffer) {
      return buffer.toString(this.encoding);
    }

    function utf16DetectIncompleteChar(buffer) {
      this.charReceived = buffer.length % 2;
      this.charLength = this.charReceived ? 2 : 0;
    }

    function base64DetectIncompleteChar(buffer) {
      this.charReceived = buffer.length % 3;
      this.charLength = this.charReceived ? 3 : 0;
    }

    },{"buffer":33}],71:[function(require,module,exports){
    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    var punycode = require('punycode');

    exports.parse = urlParse;
    exports.resolve = urlResolve;
    exports.resolveObject = urlResolveObject;
    exports.format = urlFormat;

    exports.Url = Url;

    function Url() {
      this.protocol = null;
      this.slashes = null;
      this.auth = null;
      this.host = null;
      this.port = null;
      this.hostname = null;
      this.hash = null;
      this.search = null;
      this.query = null;
      this.pathname = null;
      this.path = null;
      this.href = null;
    }

    // Reference: RFC 3986, RFC 1808, RFC 2396

    // define these here so at least they only have to be
    // compiled once on the first module load.
    var protocolPattern = /^([a-z0-9.+-]+:)/i,
        portPattern = /:[0-9]*$/,

        // RFC 2396: characters reserved for delimiting URLs.
        // We actually just auto-escape these.
        delims = ['<', '>', '"', '`', ' ', '\r', '\n', '\t'],

        // RFC 2396: characters not allowed for various reasons.
        unwise = ['{', '}', '|', '\\', '^', '`'].concat(delims),

        // Allowed by RFCs, but cause of XSS attacks.  Always escape these.
        autoEscape = ['\''].concat(unwise),
        // Characters that are never ever allowed in a hostname.
        // Note that any invalid chars are also handled, but these
        // are the ones that are *expected* to be seen, so we fast-path
        // them.
        nonHostChars = ['%', '/', '?', ';', '#'].concat(autoEscape),
        hostEndingChars = ['/', '?', '#'],
        hostnameMaxLen = 255,
        hostnamePartPattern = /^[a-z0-9A-Z_-]{0,63}$/,
        hostnamePartStart = /^([a-z0-9A-Z_-]{0,63})(.*)$/,
        // protocols that can allow "unsafe" and "unwise" chars.
        unsafeProtocol = {
          'javascript': true,
          'javascript:': true
        },
        // protocols that never have a hostname.
        hostlessProtocol = {
          'javascript': true,
          'javascript:': true
        },
        // protocols that always contain a // bit.
        slashedProtocol = {
          'http': true,
          'https': true,
          'ftp': true,
          'gopher': true,
          'file': true,
          'http:': true,
          'https:': true,
          'ftp:': true,
          'gopher:': true,
          'file:': true
        },
        querystring = require('querystring');

    function urlParse(url, parseQueryString, slashesDenoteHost) {
      if (url && isObject(url) && url instanceof Url) return url;

      var u = new Url;
      u.parse(url, parseQueryString, slashesDenoteHost);
      return u;
    }

    Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
      if (!isString(url)) {
        throw new TypeError("Parameter 'url' must be a string, not " + typeof url);
      }

      var rest = url;

      // trim before proceeding.
      // This is to support parse stuff like "  http://foo.com  \n"
      rest = rest.trim();

      var proto = protocolPattern.exec(rest);
      if (proto) {
        proto = proto[0];
        var lowerProto = proto.toLowerCase();
        this.protocol = lowerProto;
        rest = rest.substr(proto.length);
      }

      // figure out if it's got a host
      // user@server is *always* interpreted as a hostname, and url
      // resolution will treat //foo/bar as host=foo,path=bar because that's
      // how the browser resolves relative URLs.
      if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) {
        var slashes = rest.substr(0, 2) === '//';
        if (slashes && !(proto && hostlessProtocol[proto])) {
          rest = rest.substr(2);
          this.slashes = true;
        }
      }

      if (!hostlessProtocol[proto] &&
          (slashes || (proto && !slashedProtocol[proto]))) {

        // there's a hostname.
        // the first instance of /, ?, ;, or # ends the host.
        //
        // If there is an @ in the hostname, then non-host chars *are* allowed
        // to the left of the last @ sign, unless some host-ending character
        // comes *before* the @-sign.
        // URLs are obnoxious.
        //
        // ex:
        // http://a@b@c/ => user:a@b host:c
        // http://a@b?@c => user:a host:c path:/?@c

        // v0.12 TODO(isaacs): This is not quite how Chrome does things.
        // Review our test case against browsers more comprehensively.

        // find the first instance of any hostEndingChars
        var hostEnd = -1;
        for (var i = 0; i < hostEndingChars.length; i++) {
          var hec = rest.indexOf(hostEndingChars[i]);
          if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
            hostEnd = hec;
        }

        // at this point, either we have an explicit point where the
        // auth portion cannot go past, or the last @ char is the decider.
        var auth, atSign;
        if (hostEnd === -1) {
          // atSign can be anywhere.
          atSign = rest.lastIndexOf('@');
        } else {
          // atSign must be in auth portion.
          // http://a@b/c@d => host:b auth:a path:/c@d
          atSign = rest.lastIndexOf('@', hostEnd);
        }

        // Now we have a portion which is definitely the auth.
        // Pull that off.
        if (atSign !== -1) {
          auth = rest.slice(0, atSign);
          rest = rest.slice(atSign + 1);
          this.auth = decodeURIComponent(auth);
        }

        // the host is the remaining to the left of the first non-host char
        hostEnd = -1;
        for (var i = 0; i < nonHostChars.length; i++) {
          var hec = rest.indexOf(nonHostChars[i]);
          if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
            hostEnd = hec;
        }
        // if we still have not hit it, then the entire thing is a host.
        if (hostEnd === -1)
          hostEnd = rest.length;

        this.host = rest.slice(0, hostEnd);
        rest = rest.slice(hostEnd);

        // pull out port.
        this.parseHost();

        // we've indicated that there is a hostname,
        // so even if it's empty, it has to be present.
        this.hostname = this.hostname || '';

        // if hostname begins with [ and ends with ]
        // assume that it's an IPv6 address.
        var ipv6Hostname = this.hostname[0] === '[' &&
            this.hostname[this.hostname.length - 1] === ']';

        // validate a little.
        if (!ipv6Hostname) {
          var hostparts = this.hostname.split(/\./);
          for (var i = 0, l = hostparts.length; i < l; i++) {
            var part = hostparts[i];
            if (!part) continue;
            if (!part.match(hostnamePartPattern)) {
              var newpart = '';
              for (var j = 0, k = part.length; j < k; j++) {
                if (part.charCodeAt(j) > 127) {
                  // we replace non-ASCII char with a temporary placeholder
                  // we need this to make sure size of hostname is not
                  // broken by replacing non-ASCII by nothing
                  newpart += 'x';
                } else {
                  newpart += part[j];
                }
              }
              // we test again with ASCII char only
              if (!newpart.match(hostnamePartPattern)) {
                var validParts = hostparts.slice(0, i);
                var notHost = hostparts.slice(i + 1);
                var bit = part.match(hostnamePartStart);
                if (bit) {
                  validParts.push(bit[1]);
                  notHost.unshift(bit[2]);
                }
                if (notHost.length) {
                  rest = '/' + notHost.join('.') + rest;
                }
                this.hostname = validParts.join('.');
                break;
              }
            }
          }
        }

        if (this.hostname.length > hostnameMaxLen) {
          this.hostname = '';
        } else {
          // hostnames are always lower case.
          this.hostname = this.hostname.toLowerCase();
        }

        if (!ipv6Hostname) {
          // IDNA Support: Returns a puny coded representation of "domain".
          // It only converts the part of the domain name that
          // has non ASCII characters. I.e. it dosent matter if
          // you call it with a domain that already is in ASCII.
          var domainArray = this.hostname.split('.');
          var newOut = [];
          for (var i = 0; i < domainArray.length; ++i) {
            var s = domainArray[i];
            newOut.push(s.match(/[^A-Za-z0-9_-]/) ?
                'xn--' + punycode.encode(s) : s);
          }
          this.hostname = newOut.join('.');
        }

        var p = this.port ? ':' + this.port : '';
        var h = this.hostname || '';
        this.host = h + p;
        this.href += this.host;

        // strip [ and ] from the hostname
        // the host field still retains them, though
        if (ipv6Hostname) {
          this.hostname = this.hostname.substr(1, this.hostname.length - 2);
          if (rest[0] !== '/') {
            rest = '/' + rest;
          }
        }
      }

      // now rest is set to the post-host stuff.
      // chop off any delim chars.
      if (!unsafeProtocol[lowerProto]) {

        // First, make 100% sure that any "autoEscape" chars get
        // escaped, even if encodeURIComponent doesn't think they
        // need to be.
        for (var i = 0, l = autoEscape.length; i < l; i++) {
          var ae = autoEscape[i];
          var esc = encodeURIComponent(ae);
          if (esc === ae) {
            esc = escape(ae);
          }
          rest = rest.split(ae).join(esc);
        }
      }

      // chop off from the tail first.
      var hash = rest.indexOf('#');
      if (hash !== -1) {
        // got a fragment string.
        this.hash = rest.substr(hash);
        rest = rest.slice(0, hash);
      }
      var qm = rest.indexOf('?');
      if (qm !== -1) {
        this.search = rest.substr(qm);
        this.query = rest.substr(qm + 1);
        if (parseQueryString) {
          this.query = querystring.parse(this.query);
        }
        rest = rest.slice(0, qm);
      } else if (parseQueryString) {
        // no query string, but parseQueryString still requested
        this.search = '';
        this.query = {};
      }
      if (rest) this.pathname = rest;
      if (slashedProtocol[lowerProto] &&
          this.hostname && !this.pathname) {
        this.pathname = '/';
      }

      //to support http.request
      if (this.pathname || this.search) {
        var p = this.pathname || '';
        var s = this.search || '';
        this.path = p + s;
      }

      // finally, reconstruct the href based on what has been validated.
      this.href = this.format();
      return this;
    };

    // format a parsed object into a url string
    function urlFormat(obj) {
      // ensure it's an object, and not a string url.
      // If it's an obj, this is a no-op.
      // this way, you can call url_format() on strings
      // to clean up potentially wonky urls.
      if (isString(obj)) obj = urlParse(obj);
      if (!(obj instanceof Url)) return Url.prototype.format.call(obj);
      return obj.format();
    }

    Url.prototype.format = function() {
      var auth = this.auth || '';
      if (auth) {
        auth = encodeURIComponent(auth);
        auth = auth.replace(/%3A/i, ':');
        auth += '@';
      }

      var protocol = this.protocol || '',
          pathname = this.pathname || '',
          hash = this.hash || '',
          host = false,
          query = '';

      if (this.host) {
        host = auth + this.host;
      } else if (this.hostname) {
        host = auth + (this.hostname.indexOf(':') === -1 ?
            this.hostname :
            '[' + this.hostname + ']');
        if (this.port) {
          host += ':' + this.port;
        }
      }

      if (this.query &&
          isObject(this.query) &&
          Object.keys(this.query).length) {
        query = querystring.stringify(this.query);
      }

      var search = this.search || (query && ('?' + query)) || '';

      if (protocol && protocol.substr(-1) !== ':') protocol += ':';

      // only the slashedProtocols get the //.  Not mailto:, xmpp:, etc.
      // unless they had them to begin with.
      if (this.slashes ||
          (!protocol || slashedProtocol[protocol]) && host !== false) {
        host = '//' + (host || '');
        if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname;
      } else if (!host) {
        host = '';
      }

      if (hash && hash.charAt(0) !== '#') hash = '#' + hash;
      if (search && search.charAt(0) !== '?') search = '?' + search;

      pathname = pathname.replace(/[?#]/g, function(match) {
        return encodeURIComponent(match);
      });
      search = search.replace('#', '%23');

      return protocol + host + pathname + search + hash;
    };

    function urlResolve(source, relative) {
      return urlParse(source, false, true).resolve(relative);
    }

    Url.prototype.resolve = function(relative) {
      return this.resolveObject(urlParse(relative, false, true)).format();
    };

    function urlResolveObject(source, relative) {
      if (!source) return relative;
      return urlParse(source, false, true).resolveObject(relative);
    }

    Url.prototype.resolveObject = function(relative) {
      if (isString(relative)) {
        var rel = new Url();
        rel.parse(relative, false, true);
        relative = rel;
      }

      var result = new Url();
      Object.keys(this).forEach(function(k) {
        result[k] = this[k];
      }, this);

      // hash is always overridden, no matter what.
      // even href="" will remove it.
      result.hash = relative.hash;

      // if the relative url is empty, then there's nothing left to do here.
      if (relative.href === '') {
        result.href = result.format();
        return result;
      }

      // hrefs like //foo/bar always cut to the protocol.
      if (relative.slashes && !relative.protocol) {
        // take everything except the protocol from relative
        Object.keys(relative).forEach(function(k) {
          if (k !== 'protocol')
            result[k] = relative[k];
        });

        //urlParse appends trailing / to urls like http://www.example.com
        if (slashedProtocol[result.protocol] &&
            result.hostname && !result.pathname) {
          result.path = result.pathname = '/';
        }

        result.href = result.format();
        return result;
      }

      if (relative.protocol && relative.protocol !== result.protocol) {
        // if it's a known url protocol, then changing
        // the protocol does weird things
        // first, if it's not file:, then we MUST have a host,
        // and if there was a path
        // to begin with, then we MUST have a path.
        // if it is file:, then the host is dropped,
        // because that's known to be hostless.
        // anything else is assumed to be absolute.
        if (!slashedProtocol[relative.protocol]) {
          Object.keys(relative).forEach(function(k) {
            result[k] = relative[k];
          });
          result.href = result.format();
          return result;
        }

        result.protocol = relative.protocol;
        if (!relative.host && !hostlessProtocol[relative.protocol]) {
          var relPath = (relative.pathname || '').split('/');
          while (relPath.length && !(relative.host = relPath.shift()));
          if (!relative.host) relative.host = '';
          if (!relative.hostname) relative.hostname = '';
          if (relPath[0] !== '') relPath.unshift('');
          if (relPath.length < 2) relPath.unshift('');
          result.pathname = relPath.join('/');
        } else {
          result.pathname = relative.pathname;
        }
        result.search = relative.search;
        result.query = relative.query;
        result.host = relative.host || '';
        result.auth = relative.auth;
        result.hostname = relative.hostname || relative.host;
        result.port = relative.port;
        // to support http.request
        if (result.pathname || result.search) {
          var p = result.pathname || '';
          var s = result.search || '';
          result.path = p + s;
        }
        result.slashes = result.slashes || relative.slashes;
        result.href = result.format();
        return result;
      }

      var isSourceAbs = (result.pathname && result.pathname.charAt(0) === '/'),
          isRelAbs = (
              relative.host ||
              relative.pathname && relative.pathname.charAt(0) === '/'
          ),
          mustEndAbs = (isRelAbs || isSourceAbs ||
                        (result.host && relative.pathname)),
          removeAllDots = mustEndAbs,
          srcPath = result.pathname && result.pathname.split('/') || [],
          relPath = relative.pathname && relative.pathname.split('/') || [],
          psychotic = result.protocol && !slashedProtocol[result.protocol];

      // if the url is a non-slashed url, then relative
      // links like ../.. should be able
      // to crawl up to the hostname, as well.  This is strange.
      // result.protocol has already been set by now.
      // Later on, put the first path part into the host field.
      if (psychotic) {
        result.hostname = '';
        result.port = null;
        if (result.host) {
          if (srcPath[0] === '') srcPath[0] = result.host;
          else srcPath.unshift(result.host);
        }
        result.host = '';
        if (relative.protocol) {
          relative.hostname = null;
          relative.port = null;
          if (relative.host) {
            if (relPath[0] === '') relPath[0] = relative.host;
            else relPath.unshift(relative.host);
          }
          relative.host = null;
        }
        mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');
      }

      if (isRelAbs) {
        // it's absolute.
        result.host = (relative.host || relative.host === '') ?
                      relative.host : result.host;
        result.hostname = (relative.hostname || relative.hostname === '') ?
                          relative.hostname : result.hostname;
        result.search = relative.search;
        result.query = relative.query;
        srcPath = relPath;
        // fall through to the dot-handling below.
      } else if (relPath.length) {
        // it's relative
        // throw away the existing file, and take the new path instead.
        if (!srcPath) srcPath = [];
        srcPath.pop();
        srcPath = srcPath.concat(relPath);
        result.search = relative.search;
        result.query = relative.query;
      } else if (!isNullOrUndefined(relative.search)) {
        // just pull out the search.
        // like href='?foo'.
        // Put this after the other two cases because it simplifies the booleans
        if (psychotic) {
          result.hostname = result.host = srcPath.shift();
          //occationaly the auth can get stuck only in host
          //this especialy happens in cases like
          //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
          var authInHost = result.host && result.host.indexOf('@') > 0 ?
                           result.host.split('@') : false;
          if (authInHost) {
            result.auth = authInHost.shift();
            result.host = result.hostname = authInHost.shift();
          }
        }
        result.search = relative.search;
        result.query = relative.query;
        //to support http.request
        if (!isNull(result.pathname) || !isNull(result.search)) {
          result.path = (result.pathname ? result.pathname : '') +
                        (result.search ? result.search : '');
        }
        result.href = result.format();
        return result;
      }

      if (!srcPath.length) {
        // no path at all.  easy.
        // we've already handled the other stuff above.
        result.pathname = null;
        //to support http.request
        if (result.search) {
          result.path = '/' + result.search;
        } else {
          result.path = null;
        }
        result.href = result.format();
        return result;
      }

      // if a url ENDs in . or .., then it must get a trailing slash.
      // however, if it ends in anything else non-slashy,
      // then it must NOT get a trailing slash.
      var last = srcPath.slice(-1)[0];
      var hasTrailingSlash = (
          (result.host || relative.host) && (last === '.' || last === '..') ||
          last === '');

      // strip single dots, resolve double dots to parent dir
      // if the path tries to go above the root, `up` ends up > 0
      var up = 0;
      for (var i = srcPath.length; i >= 0; i--) {
        last = srcPath[i];
        if (last == '.') {
          srcPath.splice(i, 1);
        } else if (last === '..') {
          srcPath.splice(i, 1);
          up++;
        } else if (up) {
          srcPath.splice(i, 1);
          up--;
        }
      }

      // if the path is allowed to go above the root, restore leading ..s
      if (!mustEndAbs && !removeAllDots) {
        for (; up--; up) {
          srcPath.unshift('..');
        }
      }

      if (mustEndAbs && srcPath[0] !== '' &&
          (!srcPath[0] || srcPath[0].charAt(0) !== '/')) {
        srcPath.unshift('');
      }

      if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {
        srcPath.push('');
      }

      var isAbsolute = srcPath[0] === '' ||
          (srcPath[0] && srcPath[0].charAt(0) === '/');

      // put the host back
      if (psychotic) {
        result.hostname = result.host = isAbsolute ? '' :
                                        srcPath.length ? srcPath.shift() : '';
        //occationaly the auth can get stuck only in host
        //this especialy happens in cases like
        //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
        var authInHost = result.host && result.host.indexOf('@') > 0 ?
                         result.host.split('@') : false;
        if (authInHost) {
          result.auth = authInHost.shift();
          result.host = result.hostname = authInHost.shift();
        }
      }

      mustEndAbs = mustEndAbs || (result.host && srcPath.length);

      if (mustEndAbs && !isAbsolute) {
        srcPath.unshift('');
      }

      if (!srcPath.length) {
        result.pathname = null;
        result.path = null;
      } else {
        result.pathname = srcPath.join('/');
      }

      //to support request.http
      if (!isNull(result.pathname) || !isNull(result.search)) {
        result.path = (result.pathname ? result.pathname : '') +
                      (result.search ? result.search : '');
      }
      result.auth = relative.auth || result.auth;
      result.slashes = result.slashes || relative.slashes;
      result.href = result.format();
      return result;
    };

    Url.prototype.parseHost = function() {
      var host = this.host;
      var port = portPattern.exec(host);
      if (port) {
        port = port[0];
        if (port !== ':') {
          this.port = port.substr(1);
        }
        host = host.substr(0, host.length - port.length);
      }
      if (host) this.hostname = host;
    };

    function isString(arg) {
      return typeof arg === "string";
    }

    function isObject(arg) {
      return typeof arg === 'object' && arg !== null;
    }

    function isNull(arg) {
      return arg === null;
    }
    function isNullOrUndefined(arg) {
      return  arg == null;
    }

    },{"punycode":43,"querystring":46}],72:[function(require,module,exports){
    module.exports = function isBuffer(arg) {
      return arg && typeof arg === 'object'
        && typeof arg.copy === 'function'
        && typeof arg.fill === 'function'
        && typeof arg.readUInt8 === 'function';
    }
    },{}],73:[function(require,module,exports){
    (function (process,global){
    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    var formatRegExp = /%[sdj%]/g;
    exports.format = function(f) {
      if (!isString(f)) {
        var objects = [];
        for (var i = 0; i < arguments.length; i++) {
          objects.push(inspect(arguments[i]));
        }
        return objects.join(' ');
      }

      var i = 1;
      var args = arguments;
      var len = args.length;
      var str = String(f).replace(formatRegExp, function(x) {
        if (x === '%%') return '%';
        if (i >= len) return x;
        switch (x) {
          case '%s': return String(args[i++]);
          case '%d': return Number(args[i++]);
          case '%j':
            try {
              return JSON.stringify(args[i++]);
            } catch (_) {
              return '[Circular]';
            }
          default:
            return x;
        }
      });
      for (var x = args[i]; i < len; x = args[++i]) {
        if (isNull(x) || !isObject(x)) {
          str += ' ' + x;
        } else {
          str += ' ' + inspect(x);
        }
      }
      return str;
    };

    // Mark that a method should not be used.
    // Returns a modified function which warns once by default.
    // If --no-deprecation is set, then it is a no-op.
    exports.deprecate = function(fn, msg) {
      // Allow for deprecating things in the process of starting up.
      if (isUndefined(global.process)) {
        return function() {
          return exports.deprecate(fn, msg).apply(this, arguments);
        };
      }

      if (process.noDeprecation === true) {
        return fn;
      }

      var warned = false;
      function deprecated() {
        if (!warned) {
          if (process.throwDeprecation) {
            throw new Error(msg);
          } else if (process.traceDeprecation) {
            console.trace(msg);
          } else {
            console.error(msg);
          }
          warned = true;
        }
        return fn.apply(this, arguments);
      }

      return deprecated;
    };

    var debugs = {};
    var debugEnviron;
    exports.debuglog = function(set) {
      if (isUndefined(debugEnviron))
        debugEnviron = process.env.NODE_DEBUG || '';
      set = set.toUpperCase();
      if (!debugs[set]) {
        if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
          var pid = process.pid;
          debugs[set] = function() {
            var msg = exports.format.apply(exports, arguments);
            console.error('%s %d: %s', set, pid, msg);
          };
        } else {
          debugs[set] = function() {};
        }
      }
      return debugs[set];
    };

    /**
     * Echos the value of a value. Trys to print the value out
     * in the best way possible given the different types.
     *
     * @param {Object} obj The object to print out.
     * @param {Object} opts Optional options object that alters the output.
     */
    /* legacy: obj, showHidden, depth, colors*/
    function inspect(obj, opts) {
      // default options
      var ctx = {
        seen: [],
        stylize: stylizeNoColor
      };
      // legacy...
      if (arguments.length >= 3) ctx.depth = arguments[2];
      if (arguments.length >= 4) ctx.colors = arguments[3];
      if (isBoolean(opts)) {
        // legacy...
        ctx.showHidden = opts;
      } else if (opts) {
        // got an "options" object
        exports._extend(ctx, opts);
      }
      // set default options
      if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
      if (isUndefined(ctx.depth)) ctx.depth = 2;
      if (isUndefined(ctx.colors)) ctx.colors = false;
      if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
      if (ctx.colors) ctx.stylize = stylizeWithColor;
      return formatValue(ctx, obj, ctx.depth);
    }
    exports.inspect = inspect;

    // http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
    inspect.colors = {
      'bold' : [1, 22],
      'italic' : [3, 23],
      'underline' : [4, 24],
      'inverse' : [7, 27],
      'white' : [37, 39],
      'grey' : [90, 39],
      'black' : [30, 39],
      'blue' : [34, 39],
      'cyan' : [36, 39],
      'green' : [32, 39],
      'magenta' : [35, 39],
      'red' : [31, 39],
      'yellow' : [33, 39]
    };

    // Don't use 'blue' not visible on cmd.exe
    inspect.styles = {
      'special': 'cyan',
      'number': 'yellow',
      'boolean': 'yellow',
      'undefined': 'grey',
      'null': 'bold',
      'string': 'green',
      'date': 'magenta',
      // "name": intentionally not styling
      'regexp': 'red'
    };

    function stylizeWithColor(str, styleType) {
      var style = inspect.styles[styleType];

      if (style) {
        return '\u001b[' + inspect.colors[style][0] + 'm' + str +
               '\u001b[' + inspect.colors[style][1] + 'm';
      } else {
        return str;
      }
    }

    function stylizeNoColor(str, styleType) {
      return str;
    }

    function arrayToHash(array) {
      var hash = {};

      array.forEach(function(val, idx) {
        hash[val] = true;
      });

      return hash;
    }

    function formatValue(ctx, value, recurseTimes) {
      // Provide a hook for user-specified inspect functions.
      // Check that value is an object with an inspect function on it
      if (ctx.customInspect &&
          value &&
          isFunction(value.inspect) &&
          // Filter out the util module, it's inspect function is special
          value.inspect !== exports.inspect &&
          // Also filter out any prototype objects using the circular check.
          !(value.constructor && value.constructor.prototype === value)) {
        var ret = value.inspect(recurseTimes, ctx);
        if (!isString(ret)) {
          ret = formatValue(ctx, ret, recurseTimes);
        }
        return ret;
      }

      // Primitive types cannot have properties
      var primitive = formatPrimitive(ctx, value);
      if (primitive) {
        return primitive;
      }

      // Look up the keys of the object.
      var keys = Object.keys(value);
      var visibleKeys = arrayToHash(keys);

      if (ctx.showHidden) {
        keys = Object.getOwnPropertyNames(value);
      }

      // IE doesn't make error fields non-enumerable
      // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
      if (isError(value)
          && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
        return formatError(value);
      }

      // Some type of object without properties can be shortcutted.
      if (keys.length === 0) {
        if (isFunction(value)) {
          var name = value.name ? ': ' + value.name : '';
          return ctx.stylize('[Function' + name + ']', 'special');
        }
        if (isRegExp(value)) {
          return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
        }
        if (isDate(value)) {
          return ctx.stylize(Date.prototype.toString.call(value), 'date');
        }
        if (isError(value)) {
          return formatError(value);
        }
      }

      var base = '', array = false, braces = ['{', '}'];

      // Make Array say that they are Array
      if (isArray(value)) {
        array = true;
        braces = ['[', ']'];
      }

      // Make functions say that they are functions
      if (isFunction(value)) {
        var n = value.name ? ': ' + value.name : '';
        base = ' [Function' + n + ']';
      }

      // Make RegExps say that they are RegExps
      if (isRegExp(value)) {
        base = ' ' + RegExp.prototype.toString.call(value);
      }

      // Make dates with properties first say the date
      if (isDate(value)) {
        base = ' ' + Date.prototype.toUTCString.call(value);
      }

      // Make error with message first say the error
      if (isError(value)) {
        base = ' ' + formatError(value);
      }

      if (keys.length === 0 && (!array || value.length == 0)) {
        return braces[0] + base + braces[1];
      }

      if (recurseTimes < 0) {
        if (isRegExp(value)) {
          return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
        } else {
          return ctx.stylize('[Object]', 'special');
        }
      }

      ctx.seen.push(value);

      var output;
      if (array) {
        output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
      } else {
        output = keys.map(function(key) {
          return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
        });
      }

      ctx.seen.pop();

      return reduceToSingleString(output, base, braces);
    }

    function formatPrimitive(ctx, value) {
      if (isUndefined(value))
        return ctx.stylize('undefined', 'undefined');
      if (isString(value)) {
        var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                                 .replace(/'/g, "\\'")
                                                 .replace(/\\"/g, '"') + '\'';
        return ctx.stylize(simple, 'string');
      }
      if (isNumber(value))
        return ctx.stylize('' + value, 'number');
      if (isBoolean(value))
        return ctx.stylize('' + value, 'boolean');
      // For some reason typeof null is "object", so special case here.
      if (isNull(value))
        return ctx.stylize('null', 'null');
    }

    function formatError(value) {
      return '[' + Error.prototype.toString.call(value) + ']';
    }

    function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
      var output = [];
      for (var i = 0, l = value.length; i < l; ++i) {
        if (hasOwnProperty(value, String(i))) {
          output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
              String(i), true));
        } else {
          output.push('');
        }
      }
      keys.forEach(function(key) {
        if (!key.match(/^\d+$/)) {
          output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
              key, true));
        }
      });
      return output;
    }

    function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
      var name, str, desc;
      desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
      if (desc.get) {
        if (desc.set) {
          str = ctx.stylize('[Getter/Setter]', 'special');
        } else {
          str = ctx.stylize('[Getter]', 'special');
        }
      } else {
        if (desc.set) {
          str = ctx.stylize('[Setter]', 'special');
        }
      }
      if (!hasOwnProperty(visibleKeys, key)) {
        name = '[' + key + ']';
      }
      if (!str) {
        if (ctx.seen.indexOf(desc.value) < 0) {
          if (isNull(recurseTimes)) {
            str = formatValue(ctx, desc.value, null);
          } else {
            str = formatValue(ctx, desc.value, recurseTimes - 1);
          }
          if (str.indexOf('\n') > -1) {
            if (array) {
              str = str.split('\n').map(function(line) {
                return '  ' + line;
              }).join('\n').substr(2);
            } else {
              str = '\n' + str.split('\n').map(function(line) {
                return '   ' + line;
              }).join('\n');
            }
          }
        } else {
          str = ctx.stylize('[Circular]', 'special');
        }
      }
      if (isUndefined(name)) {
        if (array && key.match(/^\d+$/)) {
          return str;
        }
        name = JSON.stringify('' + key);
        if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
          name = name.substr(1, name.length - 2);
          name = ctx.stylize(name, 'name');
        } else {
          name = name.replace(/'/g, "\\'")
                     .replace(/\\"/g, '"')
                     .replace(/(^"|"$)/g, "'");
          name = ctx.stylize(name, 'string');
        }
      }

      return name + ': ' + str;
    }

    function reduceToSingleString(output, base, braces) {
      var numLinesEst = 0;
      var length = output.reduce(function(prev, cur) {
        numLinesEst++;
        if (cur.indexOf('\n') >= 0) numLinesEst++;
        return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
      }, 0);

      if (length > 60) {
        return braces[0] +
               (base === '' ? '' : base + '\n ') +
               ' ' +
               output.join(',\n  ') +
               ' ' +
               braces[1];
      }

      return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
    }

    // NOTE: These type checking functions intentionally don't use `instanceof`
    // because it is fragile and can be easily faked with `Object.create()`.
    function isArray(ar) {
      return Array.isArray(ar);
    }
    exports.isArray = isArray;

    function isBoolean(arg) {
      return typeof arg === 'boolean';
    }
    exports.isBoolean = isBoolean;

    function isNull(arg) {
      return arg === null;
    }
    exports.isNull = isNull;

    function isNullOrUndefined(arg) {
      return arg == null;
    }
    exports.isNullOrUndefined = isNullOrUndefined;

    function isNumber(arg) {
      return typeof arg === 'number';
    }
    exports.isNumber = isNumber;

    function isString(arg) {
      return typeof arg === 'string';
    }
    exports.isString = isString;

    function isSymbol(arg) {
      return typeof arg === 'symbol';
    }
    exports.isSymbol = isSymbol;

    function isUndefined(arg) {
      return arg === void 0;
    }
    exports.isUndefined = isUndefined;

    function isRegExp(re) {
      return isObject(re) && objectToString(re) === '[object RegExp]';
    }
    exports.isRegExp = isRegExp;

    function isObject(arg) {
      return typeof arg === 'object' && arg !== null;
    }
    exports.isObject = isObject;

    function isDate(d) {
      return isObject(d) && objectToString(d) === '[object Date]';
    }
    exports.isDate = isDate;

    function isError(e) {
      return isObject(e) &&
          (objectToString(e) === '[object Error]' || e instanceof Error);
    }
    exports.isError = isError;

    function isFunction(arg) {
      return typeof arg === 'function';
    }
    exports.isFunction = isFunction;

    function isPrimitive(arg) {
      return arg === null ||
             typeof arg === 'boolean' ||
             typeof arg === 'number' ||
             typeof arg === 'string' ||
             typeof arg === 'symbol' ||  // ES6 symbol
             typeof arg === 'undefined';
    }
    exports.isPrimitive = isPrimitive;

    exports.isBuffer = require('./support/isBuffer');

    function objectToString(o) {
      return Object.prototype.toString.call(o);
    }

    function pad(n) {
      return n < 10 ? '0' + n.toString(10) : n.toString(10);
    }

    var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
                  'Oct', 'Nov', 'Dec'];

    // 26 Feb 16:19:34
    function timestamp() {
      var d = new Date();
      var time = [pad(d.getHours()),
                  pad(d.getMinutes()),
                  pad(d.getSeconds())].join(':');
      return [d.getDate(), months[d.getMonth()], time].join(' ');
    }

    // log is just a thin wrapper to console.log that prepends a timestamp
    exports.log = function() {
      console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
    };

    /**
     * Inherit the prototype methods from one constructor into another.
     *
     * The Function.prototype.inherits from lang.js rewritten as a standalone
     * function (not on Function.prototype). NOTE: If this file is to be loaded
     * during bootstrapping this function needs to be rewritten using some native
     * functions as prototype setup using normal JavaScript does not work as
     * expected during bootstrapping (see mirror.js in r114903).
     *
     * @param {function} ctor Constructor function which needs to inherit the
     *     prototype.
     * @param {function} superCtor Constructor function to inherit prototype from.
     */
    exports.inherits = require('inherits');

    exports._extend = function(origin, add) {
      // Don't do anything if add isn't an object
      if (!add || !isObject(add)) return origin;

      var keys = Object.keys(add);
      var i = keys.length;
      while (i--) {
        origin[keys[i]] = add[keys[i]];
      }
      return origin;
    };

    function hasOwnProperty(obj, prop) {
      return Object.prototype.hasOwnProperty.call(obj, prop);
    }

    }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{"./support/isBuffer":72,"_process":42,"inherits":38}],74:[function(require,module,exports){
    module.exports = extend

    var hasOwnProperty = Object.prototype.hasOwnProperty;

    function extend() {
        var target = {}

        for (var i = 0; i < arguments.length; i++) {
            var source = arguments[i]

            for (var key in source) {
                if (hasOwnProperty.call(source, key)) {
                    target[key] = source[key]
                }
            }
        }

        return target
    }

    },{}],75:[function(require,module,exports){

    exports = module.exports = function(bytes)
    {
        var i = 0;
        while(i < bytes.length)
        {
            if(     (// ASCII
                        bytes[i] == 0x09 ||
                        bytes[i] == 0x0A ||
                        bytes[i] == 0x0D ||
                        (0x20 <= bytes[i] && bytes[i] <= 0x7E)
                    )
              ) {
                  i += 1;
                  continue;
              }

            if(     (// non-overlong 2-byte
                        (0xC2 <= bytes[i] && bytes[i] <= 0xDF) &&
                        (0x80 <= bytes[i+1] && bytes[i+1] <= 0xBF)
                    )
              ) {
                  i += 2;
                  continue;
              }

            if(     (// excluding overlongs
                        bytes[i] == 0xE0 &&
                        (0xA0 <= bytes[i + 1] && bytes[i + 1] <= 0xBF) &&
                        (0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF)
                    ) ||
                    (// straight 3-byte
                     ((0xE1 <= bytes[i] && bytes[i] <= 0xEC) ||
                      bytes[i] == 0xEE ||
                      bytes[i] == 0xEF) &&
                     (0x80 <= bytes[i + 1] && bytes[i+1] <= 0xBF) &&
                     (0x80 <= bytes[i+2] && bytes[i+2] <= 0xBF)
                    ) ||
                    (// excluding surrogates
                     bytes[i] == 0xED &&
                     (0x80 <= bytes[i+1] && bytes[i+1] <= 0x9F) &&
                     (0x80 <= bytes[i+2] && bytes[i+2] <= 0xBF)
                    )
              ) {
                  i += 3;
                  continue;
              }

            if(     (// planes 1-3
                        bytes[i] == 0xF0 &&
                        (0x90 <= bytes[i + 1] && bytes[i + 1] <= 0xBF) &&
                        (0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF) &&
                        (0x80 <= bytes[i + 3] && bytes[i + 3] <= 0xBF)
                    ) ||
                    (// planes 4-15
                     (0xF1 <= bytes[i] && bytes[i] <= 0xF3) &&
                     (0x80 <= bytes[i + 1] && bytes[i + 1] <= 0xBF) &&
                     (0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF) &&
                     (0x80 <= bytes[i + 3] && bytes[i + 3] <= 0xBF)
                    ) ||
                    (// plane 16
                     bytes[i] == 0xF4 &&
                     (0x80 <= bytes[i + 1] && bytes[i + 1] <= 0x8F) &&
                     (0x80 <= bytes[i + 2] && bytes[i + 2] <= 0xBF) &&
                     (0x80 <= bytes[i + 3] && bytes[i + 3] <= 0xBF)
                    )
              ) {
                  i += 4;
                  continue;
              }

            return false;
        }

        return true;
    }

    },{}],76:[function(require,module,exports){
    var hashClear = require('./_hashClear'),
        hashDelete = require('./_hashDelete'),
        hashGet = require('./_hashGet'),
        hashHas = require('./_hashHas'),
        hashSet = require('./_hashSet');

    /**
     * Creates a hash object.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function Hash(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index < length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    // Add methods to `Hash`.
    Hash.prototype.clear = hashClear;
    Hash.prototype['delete'] = hashDelete;
    Hash.prototype.get = hashGet;
    Hash.prototype.has = hashHas;
    Hash.prototype.set = hashSet;

    module.exports = Hash;

    },{"./_hashClear":97,"./_hashDelete":98,"./_hashGet":99,"./_hashHas":100,"./_hashSet":101}],77:[function(require,module,exports){
    var listCacheClear = require('./_listCacheClear'),
        listCacheDelete = require('./_listCacheDelete'),
        listCacheGet = require('./_listCacheGet'),
        listCacheHas = require('./_listCacheHas'),
        listCacheSet = require('./_listCacheSet');

    /**
     * Creates an list cache object.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function ListCache(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index < length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    // Add methods to `ListCache`.
    ListCache.prototype.clear = listCacheClear;
    ListCache.prototype['delete'] = listCacheDelete;
    ListCache.prototype.get = listCacheGet;
    ListCache.prototype.has = listCacheHas;
    ListCache.prototype.set = listCacheSet;

    module.exports = ListCache;

    },{"./_listCacheClear":106,"./_listCacheDelete":107,"./_listCacheGet":108,"./_listCacheHas":109,"./_listCacheSet":110}],78:[function(require,module,exports){
    var getNative = require('./_getNative'),
        root = require('./_root');

    /* Built-in method references that are verified to be native. */
    var Map = getNative(root, 'Map');

    module.exports = Map;

    },{"./_getNative":94,"./_root":119}],79:[function(require,module,exports){
    var mapCacheClear = require('./_mapCacheClear'),
        mapCacheDelete = require('./_mapCacheDelete'),
        mapCacheGet = require('./_mapCacheGet'),
        mapCacheHas = require('./_mapCacheHas'),
        mapCacheSet = require('./_mapCacheSet');

    /**
     * Creates a map cache object to store key-value pairs.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function MapCache(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index < length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    // Add methods to `MapCache`.
    MapCache.prototype.clear = mapCacheClear;
    MapCache.prototype['delete'] = mapCacheDelete;
    MapCache.prototype.get = mapCacheGet;
    MapCache.prototype.has = mapCacheHas;
    MapCache.prototype.set = mapCacheSet;

    module.exports = MapCache;

    },{"./_mapCacheClear":111,"./_mapCacheDelete":112,"./_mapCacheGet":113,"./_mapCacheHas":114,"./_mapCacheSet":115}],80:[function(require,module,exports){
    var root = require('./_root');

    /** Built-in value references. */
    var Symbol = root.Symbol;

    module.exports = Symbol;

    },{"./_root":119}],81:[function(require,module,exports){
    /**
     * A specialized version of `_.map` for arrays without support for iteratee
     * shorthands.
     *
     * @private
     * @param {Array} [array] The array to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     */
    function arrayMap(array, iteratee) {
      var index = -1,
          length = array == null ? 0 : array.length,
          result = Array(length);

      while (++index < length) {
        result[index] = iteratee(array[index], index, array);
      }
      return result;
    }

    module.exports = arrayMap;

    },{}],82:[function(require,module,exports){
    var baseAssignValue = require('./_baseAssignValue'),
        eq = require('./eq');

    /** Used for built-in method references. */
    var objectProto = Object.prototype;

    /** Used to check objects for own properties. */
    var hasOwnProperty = objectProto.hasOwnProperty;

    /**
     * Assigns `value` to `key` of `object` if the existing value is not equivalent
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {string} key The key of the property to assign.
     * @param {*} value The value to assign.
     */
    function assignValue(object, key, value) {
      var objValue = object[key];
      if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
          (value === undefined && !(key in object))) {
        baseAssignValue(object, key, value);
      }
    }

    module.exports = assignValue;

    },{"./_baseAssignValue":84,"./eq":123}],83:[function(require,module,exports){
    var eq = require('./eq');

    /**
     * Gets the index at which the `key` is found in `array` of key-value pairs.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} key The key to search for.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function assocIndexOf(array, key) {
      var length = array.length;
      while (length--) {
        if (eq(array[length][0], key)) {
          return length;
        }
      }
      return -1;
    }

    module.exports = assocIndexOf;

    },{"./eq":123}],84:[function(require,module,exports){
    var defineProperty = require('./_defineProperty');

    /**
     * The base implementation of `assignValue` and `assignMergeValue` without
     * value checks.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {string} key The key of the property to assign.
     * @param {*} value The value to assign.
     */
    function baseAssignValue(object, key, value) {
      if (key == '__proto__' && defineProperty) {
        defineProperty(object, key, {
          'configurable': true,
          'enumerable': true,
          'value': value,
          'writable': true
        });
      } else {
        object[key] = value;
      }
    }

    module.exports = baseAssignValue;

    },{"./_defineProperty":91}],85:[function(require,module,exports){
    var Symbol = require('./_Symbol'),
        getRawTag = require('./_getRawTag'),
        objectToString = require('./_objectToString');

    /** `Object#toString` result references. */
    var nullTag = '[object Null]',
        undefinedTag = '[object Undefined]';

    /** Built-in value references. */
    var symToStringTag = Symbol ? Symbol.toStringTag : undefined;

    /**
     * The base implementation of `getTag` without fallbacks for buggy environments.
     *
     * @private
     * @param {*} value The value to query.
     * @returns {string} Returns the `toStringTag`.
     */
    function baseGetTag(value) {
      if (value == null) {
        return value === undefined ? undefinedTag : nullTag;
      }
      return (symToStringTag && symToStringTag in Object(value))
        ? getRawTag(value)
        : objectToString(value);
    }

    module.exports = baseGetTag;

    },{"./_Symbol":80,"./_getRawTag":95,"./_objectToString":118}],86:[function(require,module,exports){
    var isFunction = require('./isFunction'),
        isMasked = require('./_isMasked'),
        isObject = require('./isObject'),
        toSource = require('./_toSource');

    /**
     * Used to match `RegExp`
     * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
     */
    var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;

    /** Used to detect host constructors (Safari). */
    var reIsHostCtor = /^\[object .+?Constructor\]$/;

    /** Used for built-in method references. */
    var funcProto = Function.prototype,
        objectProto = Object.prototype;

    /** Used to resolve the decompiled source of functions. */
    var funcToString = funcProto.toString;

    /** Used to check objects for own properties. */
    var hasOwnProperty = objectProto.hasOwnProperty;

    /** Used to detect if a method is native. */
    var reIsNative = RegExp('^' +
      funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
      .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
    );

    /**
     * The base implementation of `_.isNative` without bad shim checks.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a native function,
     *  else `false`.
     */
    function baseIsNative(value) {
      if (!isObject(value) || isMasked(value)) {
        return false;
      }
      var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
      return pattern.test(toSource(value));
    }

    module.exports = baseIsNative;

    },{"./_isMasked":105,"./_toSource":122,"./isFunction":125,"./isObject":126}],87:[function(require,module,exports){
    var assignValue = require('./_assignValue'),
        castPath = require('./_castPath'),
        isIndex = require('./_isIndex'),
        isObject = require('./isObject'),
        toKey = require('./_toKey');

    /**
     * The base implementation of `_.set`.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @param {Function} [customizer] The function to customize path creation.
     * @returns {Object} Returns `object`.
     */
    function baseSet(object, path, value, customizer) {
      if (!isObject(object)) {
        return object;
      }
      path = castPath(path, object);

      var index = -1,
          length = path.length,
          lastIndex = length - 1,
          nested = object;

      while (nested != null && ++index < length) {
        var key = toKey(path[index]),
            newValue = value;

        if (index != lastIndex) {
          var objValue = nested[key];
          newValue = customizer ? customizer(objValue, key, nested) : undefined;
          if (newValue === undefined) {
            newValue = isObject(objValue)
              ? objValue
              : (isIndex(path[index + 1]) ? [] : {});
          }
        }
        assignValue(nested, key, newValue);
        nested = nested[key];
      }
      return object;
    }

    module.exports = baseSet;

    },{"./_assignValue":82,"./_castPath":89,"./_isIndex":102,"./_toKey":121,"./isObject":126}],88:[function(require,module,exports){
    var Symbol = require('./_Symbol'),
        arrayMap = require('./_arrayMap'),
        isArray = require('./isArray'),
        isSymbol = require('./isSymbol');

    /** Used as references for various `Number` constants. */
    var INFINITY = 1 / 0;

    /** Used to convert symbols to primitives and strings. */
    var symbolProto = Symbol ? Symbol.prototype : undefined,
        symbolToString = symbolProto ? symbolProto.toString : undefined;

    /**
     * The base implementation of `_.toString` which doesn't convert nullish
     * values to empty strings.
     *
     * @private
     * @param {*} value The value to process.
     * @returns {string} Returns the string.
     */
    function baseToString(value) {
      // Exit early for strings to avoid a performance hit in some environments.
      if (typeof value == 'string') {
        return value;
      }
      if (isArray(value)) {
        // Recursively convert values (susceptible to call stack limits).
        return arrayMap(value, baseToString) + '';
      }
      if (isSymbol(value)) {
        return symbolToString ? symbolToString.call(value) : '';
      }
      var result = (value + '');
      return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
    }

    module.exports = baseToString;

    },{"./_Symbol":80,"./_arrayMap":81,"./isArray":124,"./isSymbol":128}],89:[function(require,module,exports){
    var isArray = require('./isArray'),
        isKey = require('./_isKey'),
        stringToPath = require('./_stringToPath'),
        toString = require('./toString');

    /**
     * Casts `value` to a path array if it's not one.
     *
     * @private
     * @param {*} value The value to inspect.
     * @param {Object} [object] The object to query keys on.
     * @returns {Array} Returns the cast property path array.
     */
    function castPath(value, object) {
      if (isArray(value)) {
        return value;
      }
      return isKey(value, object) ? [value] : stringToPath(toString(value));
    }

    module.exports = castPath;

    },{"./_isKey":103,"./_stringToPath":120,"./isArray":124,"./toString":132}],90:[function(require,module,exports){
    var root = require('./_root');

    /** Used to detect overreaching core-js shims. */
    var coreJsData = root['__core-js_shared__'];

    module.exports = coreJsData;

    },{"./_root":119}],91:[function(require,module,exports){
    var getNative = require('./_getNative');

    var defineProperty = (function() {
      try {
        var func = getNative(Object, 'defineProperty');
        func({}, '', {});
        return func;
      } catch (e) {}
    }());

    module.exports = defineProperty;

    },{"./_getNative":94}],92:[function(require,module,exports){
    (function (global){
    /** Detect free variable `global` from Node.js. */
    var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;

    module.exports = freeGlobal;

    }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{}],93:[function(require,module,exports){
    var isKeyable = require('./_isKeyable');

    /**
     * Gets the data for `map`.
     *
     * @private
     * @param {Object} map The map to query.
     * @param {string} key The reference key.
     * @returns {*} Returns the map data.
     */
    function getMapData(map, key) {
      var data = map.__data__;
      return isKeyable(key)
        ? data[typeof key == 'string' ? 'string' : 'hash']
        : data.map;
    }

    module.exports = getMapData;

    },{"./_isKeyable":104}],94:[function(require,module,exports){
    var baseIsNative = require('./_baseIsNative'),
        getValue = require('./_getValue');

    /**
     * Gets the native function at `key` of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {string} key The key of the method to get.
     * @returns {*} Returns the function if it's native, else `undefined`.
     */
    function getNative(object, key) {
      var value = getValue(object, key);
      return baseIsNative(value) ? value : undefined;
    }

    module.exports = getNative;

    },{"./_baseIsNative":86,"./_getValue":96}],95:[function(require,module,exports){
    var Symbol = require('./_Symbol');

    /** Used for built-in method references. */
    var objectProto = Object.prototype;

    /** Used to check objects for own properties. */
    var hasOwnProperty = objectProto.hasOwnProperty;

    /**
     * Used to resolve the
     * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
     * of values.
     */
    var nativeObjectToString = objectProto.toString;

    /** Built-in value references. */
    var symToStringTag = Symbol ? Symbol.toStringTag : undefined;

    /**
     * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
     *
     * @private
     * @param {*} value The value to query.
     * @returns {string} Returns the raw `toStringTag`.
     */
    function getRawTag(value) {
      var isOwn = hasOwnProperty.call(value, symToStringTag),
          tag = value[symToStringTag];

      try {
        value[symToStringTag] = undefined;
        var unmasked = true;
      } catch (e) {}

      var result = nativeObjectToString.call(value);
      if (unmasked) {
        if (isOwn) {
          value[symToStringTag] = tag;
        } else {
          delete value[symToStringTag];
        }
      }
      return result;
    }

    module.exports = getRawTag;

    },{"./_Symbol":80}],96:[function(require,module,exports){
    /**
     * Gets the value at `key` of `object`.
     *
     * @private
     * @param {Object} [object] The object to query.
     * @param {string} key The key of the property to get.
     * @returns {*} Returns the property value.
     */
    function getValue(object, key) {
      return object == null ? undefined : object[key];
    }

    module.exports = getValue;

    },{}],97:[function(require,module,exports){
    var nativeCreate = require('./_nativeCreate');

    /**
     * Removes all key-value entries from the hash.
     *
     * @private
     * @name clear
     * @memberOf Hash
     */
    function hashClear() {
      this.__data__ = nativeCreate ? nativeCreate(null) : {};
      this.size = 0;
    }

    module.exports = hashClear;

    },{"./_nativeCreate":117}],98:[function(require,module,exports){
    /**
     * Removes `key` and its value from the hash.
     *
     * @private
     * @name delete
     * @memberOf Hash
     * @param {Object} hash The hash to modify.
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function hashDelete(key) {
      var result = this.has(key) && delete this.__data__[key];
      this.size -= result ? 1 : 0;
      return result;
    }

    module.exports = hashDelete;

    },{}],99:[function(require,module,exports){
    var nativeCreate = require('./_nativeCreate');

    /** Used to stand-in for `undefined` hash values. */
    var HASH_UNDEFINED = '__lodash_hash_undefined__';

    /** Used for built-in method references. */
    var objectProto = Object.prototype;

    /** Used to check objects for own properties. */
    var hasOwnProperty = objectProto.hasOwnProperty;

    /**
     * Gets the hash value for `key`.
     *
     * @private
     * @name get
     * @memberOf Hash
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function hashGet(key) {
      var data = this.__data__;
      if (nativeCreate) {
        var result = data[key];
        return result === HASH_UNDEFINED ? undefined : result;
      }
      return hasOwnProperty.call(data, key) ? data[key] : undefined;
    }

    module.exports = hashGet;

    },{"./_nativeCreate":117}],100:[function(require,module,exports){
    var nativeCreate = require('./_nativeCreate');

    /** Used for built-in method references. */
    var objectProto = Object.prototype;

    /** Used to check objects for own properties. */
    var hasOwnProperty = objectProto.hasOwnProperty;

    /**
     * Checks if a hash value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf Hash
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function hashHas(key) {
      var data = this.__data__;
      return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
    }

    module.exports = hashHas;

    },{"./_nativeCreate":117}],101:[function(require,module,exports){
    var nativeCreate = require('./_nativeCreate');

    /** Used to stand-in for `undefined` hash values. */
    var HASH_UNDEFINED = '__lodash_hash_undefined__';

    /**
     * Sets the hash `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf Hash
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the hash instance.
     */
    function hashSet(key, value) {
      var data = this.__data__;
      this.size += this.has(key) ? 0 : 1;
      data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
      return this;
    }

    module.exports = hashSet;

    },{"./_nativeCreate":117}],102:[function(require,module,exports){
    /** Used as references for various `Number` constants. */
    var MAX_SAFE_INTEGER = 9007199254740991;

    /** Used to detect unsigned integer values. */
    var reIsUint = /^(?:0|[1-9]\d*)$/;

    /**
     * Checks if `value` is a valid array-like index.
     *
     * @private
     * @param {*} value The value to check.
     * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
     * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
     */
    function isIndex(value, length) {
      length = length == null ? MAX_SAFE_INTEGER : length;
      return !!length &&
        (typeof value == 'number' || reIsUint.test(value)) &&
        (value > -1 && value % 1 == 0 && value < length);
    }

    module.exports = isIndex;

    },{}],103:[function(require,module,exports){
    var isArray = require('./isArray'),
        isSymbol = require('./isSymbol');

    /** Used to match property names within property paths. */
    var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
        reIsPlainProp = /^\w*$/;

    /**
     * Checks if `value` is a property name and not a property path.
     *
     * @private
     * @param {*} value The value to check.
     * @param {Object} [object] The object to query keys on.
     * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
     */
    function isKey(value, object) {
      if (isArray(value)) {
        return false;
      }
      var type = typeof value;
      if (type == 'number' || type == 'symbol' || type == 'boolean' ||
          value == null || isSymbol(value)) {
        return true;
      }
      return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
        (object != null && value in Object(object));
    }

    module.exports = isKey;

    },{"./isArray":124,"./isSymbol":128}],104:[function(require,module,exports){
    /**
     * Checks if `value` is suitable for use as unique object key.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
     */
    function isKeyable(value) {
      var type = typeof value;
      return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
        ? (value !== '__proto__')
        : (value === null);
    }

    module.exports = isKeyable;

    },{}],105:[function(require,module,exports){
    var coreJsData = require('./_coreJsData');

    /** Used to detect methods masquerading as native. */
    var maskSrcKey = (function() {
      var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
      return uid ? ('Symbol(src)_1.' + uid) : '';
    }());

    /**
     * Checks if `func` has its source masked.
     *
     * @private
     * @param {Function} func The function to check.
     * @returns {boolean} Returns `true` if `func` is masked, else `false`.
     */
    function isMasked(func) {
      return !!maskSrcKey && (maskSrcKey in func);
    }

    module.exports = isMasked;

    },{"./_coreJsData":90}],106:[function(require,module,exports){
    /**
     * Removes all key-value entries from the list cache.
     *
     * @private
     * @name clear
     * @memberOf ListCache
     */
    function listCacheClear() {
      this.__data__ = [];
      this.size = 0;
    }

    module.exports = listCacheClear;

    },{}],107:[function(require,module,exports){
    var assocIndexOf = require('./_assocIndexOf');

    /** Used for built-in method references. */
    var arrayProto = Array.prototype;

    /** Built-in value references. */
    var splice = arrayProto.splice;

    /**
     * Removes `key` and its value from the list cache.
     *
     * @private
     * @name delete
     * @memberOf ListCache
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function listCacheDelete(key) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      if (index < 0) {
        return false;
      }
      var lastIndex = data.length - 1;
      if (index == lastIndex) {
        data.pop();
      } else {
        splice.call(data, index, 1);
      }
      --this.size;
      return true;
    }

    module.exports = listCacheDelete;

    },{"./_assocIndexOf":83}],108:[function(require,module,exports){
    var assocIndexOf = require('./_assocIndexOf');

    /**
     * Gets the list cache value for `key`.
     *
     * @private
     * @name get
     * @memberOf ListCache
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function listCacheGet(key) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      return index < 0 ? undefined : data[index][1];
    }

    module.exports = listCacheGet;

    },{"./_assocIndexOf":83}],109:[function(require,module,exports){
    var assocIndexOf = require('./_assocIndexOf');

    /**
     * Checks if a list cache value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf ListCache
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function listCacheHas(key) {
      return assocIndexOf(this.__data__, key) > -1;
    }

    module.exports = listCacheHas;

    },{"./_assocIndexOf":83}],110:[function(require,module,exports){
    var assocIndexOf = require('./_assocIndexOf');

    /**
     * Sets the list cache `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf ListCache
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the list cache instance.
     */
    function listCacheSet(key, value) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      if (index < 0) {
        ++this.size;
        data.push([key, value]);
      } else {
        data[index][1] = value;
      }
      return this;
    }

    module.exports = listCacheSet;

    },{"./_assocIndexOf":83}],111:[function(require,module,exports){
    var Hash = require('./_Hash'),
        ListCache = require('./_ListCache'),
        Map = require('./_Map');

    /**
     * Removes all key-value entries from the map.
     *
     * @private
     * @name clear
     * @memberOf MapCache
     */
    function mapCacheClear() {
      this.size = 0;
      this.__data__ = {
        'hash': new Hash,
        'map': new (Map || ListCache),
        'string': new Hash
      };
    }

    module.exports = mapCacheClear;

    },{"./_Hash":76,"./_ListCache":77,"./_Map":78}],112:[function(require,module,exports){
    var getMapData = require('./_getMapData');

    /**
     * Removes `key` and its value from the map.
     *
     * @private
     * @name delete
     * @memberOf MapCache
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function mapCacheDelete(key) {
      var result = getMapData(this, key)['delete'](key);
      this.size -= result ? 1 : 0;
      return result;
    }

    module.exports = mapCacheDelete;

    },{"./_getMapData":93}],113:[function(require,module,exports){
    var getMapData = require('./_getMapData');

    /**
     * Gets the map value for `key`.
     *
     * @private
     * @name get
     * @memberOf MapCache
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function mapCacheGet(key) {
      return getMapData(this, key).get(key);
    }

    module.exports = mapCacheGet;

    },{"./_getMapData":93}],114:[function(require,module,exports){
    var getMapData = require('./_getMapData');

    /**
     * Checks if a map value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf MapCache
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function mapCacheHas(key) {
      return getMapData(this, key).has(key);
    }

    module.exports = mapCacheHas;

    },{"./_getMapData":93}],115:[function(require,module,exports){
    var getMapData = require('./_getMapData');

    /**
     * Sets the map `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf MapCache
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the map cache instance.
     */
    function mapCacheSet(key, value) {
      var data = getMapData(this, key),
          size = data.size;

      data.set(key, value);
      this.size += data.size == size ? 0 : 1;
      return this;
    }

    module.exports = mapCacheSet;

    },{"./_getMapData":93}],116:[function(require,module,exports){
    var memoize = require('./memoize');

    /** Used as the maximum memoize cache size. */
    var MAX_MEMOIZE_SIZE = 500;

    /**
     * A specialized version of `_.memoize` which clears the memoized function's
     * cache when it exceeds `MAX_MEMOIZE_SIZE`.
     *
     * @private
     * @param {Function} func The function to have its output memoized.
     * @returns {Function} Returns the new memoized function.
     */
    function memoizeCapped(func) {
      var result = memoize(func, function(key) {
        if (cache.size === MAX_MEMOIZE_SIZE) {
          cache.clear();
        }
        return key;
      });

      var cache = result.cache;
      return result;
    }

    module.exports = memoizeCapped;

    },{"./memoize":130}],117:[function(require,module,exports){
    var getNative = require('./_getNative');

    /* Built-in method references that are verified to be native. */
    var nativeCreate = getNative(Object, 'create');

    module.exports = nativeCreate;

    },{"./_getNative":94}],118:[function(require,module,exports){
    /** Used for built-in method references. */
    var objectProto = Object.prototype;

    /**
     * Used to resolve the
     * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
     * of values.
     */
    var nativeObjectToString = objectProto.toString;

    /**
     * Converts `value` to a string using `Object.prototype.toString`.
     *
     * @private
     * @param {*} value The value to convert.
     * @returns {string} Returns the converted string.
     */
    function objectToString(value) {
      return nativeObjectToString.call(value);
    }

    module.exports = objectToString;

    },{}],119:[function(require,module,exports){
    var freeGlobal = require('./_freeGlobal');

    /** Detect free variable `self`. */
    var freeSelf = typeof self == 'object' && self && self.Object === Object && self;

    /** Used as a reference to the global object. */
    var root = freeGlobal || freeSelf || Function('return this')();

    module.exports = root;

    },{"./_freeGlobal":92}],120:[function(require,module,exports){
    var memoizeCapped = require('./_memoizeCapped');

    /** Used to match property names within property paths. */
    var reLeadingDot = /^\./,
        rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;

    /** Used to match backslashes in property paths. */
    var reEscapeChar = /\\(\\)?/g;

    /**
     * Converts `string` to a property path array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the property path array.
     */
    var stringToPath = memoizeCapped(function(string) {
      var result = [];
      if (reLeadingDot.test(string)) {
        result.push('');
      }
      string.replace(rePropName, function(match, number, quote, string) {
        result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
      });
      return result;
    });

    module.exports = stringToPath;

    },{"./_memoizeCapped":116}],121:[function(require,module,exports){
    var isSymbol = require('./isSymbol');

    /** Used as references for various `Number` constants. */
    var INFINITY = 1 / 0;

    /**
     * Converts `value` to a string key if it's not a string or symbol.
     *
     * @private
     * @param {*} value The value to inspect.
     * @returns {string|symbol} Returns the key.
     */
    function toKey(value) {
      if (typeof value == 'string' || isSymbol(value)) {
        return value;
      }
      var result = (value + '');
      return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
    }

    module.exports = toKey;

    },{"./isSymbol":128}],122:[function(require,module,exports){
    /** Used for built-in method references. */
    var funcProto = Function.prototype;

    /** Used to resolve the decompiled source of functions. */
    var funcToString = funcProto.toString;

    /**
     * Converts `func` to its source code.
     *
     * @private
     * @param {Function} func The function to convert.
     * @returns {string} Returns the source code.
     */
    function toSource(func) {
      if (func != null) {
        try {
          return funcToString.call(func);
        } catch (e) {}
        try {
          return (func + '');
        } catch (e) {}
      }
      return '';
    }

    module.exports = toSource;

    },{}],123:[function(require,module,exports){
    /**
     * Performs a
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * comparison between two values to determine if they are equivalent.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     * @example
     *
     * var object = { 'a': 1 };
     * var other = { 'a': 1 };
     *
     * _.eq(object, object);
     * // => true
     *
     * _.eq(object, other);
     * // => false
     *
     * _.eq('a', 'a');
     * // => true
     *
     * _.eq('a', Object('a'));
     * // => false
     *
     * _.eq(NaN, NaN);
     * // => true
     */
    function eq(value, other) {
      return value === other || (value !== value && other !== other);
    }

    module.exports = eq;

    },{}],124:[function(require,module,exports){
    /**
     * Checks if `value` is classified as an `Array` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array, else `false`.
     * @example
     *
     * _.isArray([1, 2, 3]);
     * // => true
     *
     * _.isArray(document.body.children);
     * // => false
     *
     * _.isArray('abc');
     * // => false
     *
     * _.isArray(_.noop);
     * // => false
     */
    var isArray = Array.isArray;

    module.exports = isArray;

    },{}],125:[function(require,module,exports){
    var baseGetTag = require('./_baseGetTag'),
        isObject = require('./isObject');

    /** `Object#toString` result references. */
    var asyncTag = '[object AsyncFunction]',
        funcTag = '[object Function]',
        genTag = '[object GeneratorFunction]',
        proxyTag = '[object Proxy]';

    /**
     * Checks if `value` is classified as a `Function` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a function, else `false`.
     * @example
     *
     * _.isFunction(_);
     * // => true
     *
     * _.isFunction(/abc/);
     * // => false
     */
    function isFunction(value) {
      if (!isObject(value)) {
        return false;
      }
      // The use of `Object#toString` avoids issues with the `typeof` operator
      // in Safari 9 which returns 'object' for typed arrays and other constructors.
      var tag = baseGetTag(value);
      return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
    }

    module.exports = isFunction;

    },{"./_baseGetTag":85,"./isObject":126}],126:[function(require,module,exports){
    /**
     * Checks if `value` is the
     * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
     * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an object, else `false`.
     * @example
     *
     * _.isObject({});
     * // => true
     *
     * _.isObject([1, 2, 3]);
     * // => true
     *
     * _.isObject(_.noop);
     * // => true
     *
     * _.isObject(null);
     * // => false
     */
    function isObject(value) {
      var type = typeof value;
      return value != null && (type == 'object' || type == 'function');
    }

    module.exports = isObject;

    },{}],127:[function(require,module,exports){
    /**
     * Checks if `value` is object-like. A value is object-like if it's not `null`
     * and has a `typeof` result of "object".
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
     * @example
     *
     * _.isObjectLike({});
     * // => true
     *
     * _.isObjectLike([1, 2, 3]);
     * // => true
     *
     * _.isObjectLike(_.noop);
     * // => false
     *
     * _.isObjectLike(null);
     * // => false
     */
    function isObjectLike(value) {
      return value != null && typeof value == 'object';
    }

    module.exports = isObjectLike;

    },{}],128:[function(require,module,exports){
    var baseGetTag = require('./_baseGetTag'),
        isObjectLike = require('./isObjectLike');

    /** `Object#toString` result references. */
    var symbolTag = '[object Symbol]';

    /**
     * Checks if `value` is classified as a `Symbol` primitive or object.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
     * @example
     *
     * _.isSymbol(Symbol.iterator);
     * // => true
     *
     * _.isSymbol('abc');
     * // => false
     */
    function isSymbol(value) {
      return typeof value == 'symbol' ||
        (isObjectLike(value) && baseGetTag(value) == symbolTag);
    }

    module.exports = isSymbol;

    },{"./_baseGetTag":85,"./isObjectLike":127}],129:[function(require,module,exports){
    (function (global){
    /**
     * @license
     * Lodash <https://lodash.com/>
     * Copyright JS Foundation and other contributors <https://js.foundation/>
     * Released under MIT license <https://lodash.com/license>
     * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
     * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
     */
    ;(function() {

      /** Used as a safe reference for `undefined` in pre-ES5 environments. */
      var undefined;

      /** Used as the semantic version number. */
      var VERSION = '4.17.3';

      /** Used as the size to enable large array optimizations. */
      var LARGE_ARRAY_SIZE = 200;

      /** Error message constants. */
      var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
          FUNC_ERROR_TEXT = 'Expected a function';

      /** Used to stand-in for `undefined` hash values. */
      var HASH_UNDEFINED = '__lodash_hash_undefined__';

      /** Used as the maximum memoize cache size. */
      var MAX_MEMOIZE_SIZE = 500;

      /** Used as the internal argument placeholder. */
      var PLACEHOLDER = '__lodash_placeholder__';

      /** Used to compose bitmasks for cloning. */
      var CLONE_DEEP_FLAG = 1,
          CLONE_FLAT_FLAG = 2,
          CLONE_SYMBOLS_FLAG = 4;

      /** Used to compose bitmasks for value comparisons. */
      var COMPARE_PARTIAL_FLAG = 1,
          COMPARE_UNORDERED_FLAG = 2;

      /** Used to compose bitmasks for function metadata. */
      var WRAP_BIND_FLAG = 1,
          WRAP_BIND_KEY_FLAG = 2,
          WRAP_CURRY_BOUND_FLAG = 4,
          WRAP_CURRY_FLAG = 8,
          WRAP_CURRY_RIGHT_FLAG = 16,
          WRAP_PARTIAL_FLAG = 32,
          WRAP_PARTIAL_RIGHT_FLAG = 64,
          WRAP_ARY_FLAG = 128,
          WRAP_REARG_FLAG = 256,
          WRAP_FLIP_FLAG = 512;

      /** Used as default options for `_.truncate`. */
      var DEFAULT_TRUNC_LENGTH = 30,
          DEFAULT_TRUNC_OMISSION = '...';

      /** Used to detect hot functions by number of calls within a span of milliseconds. */
      var HOT_COUNT = 800,
          HOT_SPAN = 16;

      /** Used to indicate the type of lazy iteratees. */
      var LAZY_FILTER_FLAG = 1,
          LAZY_MAP_FLAG = 2,
          LAZY_WHILE_FLAG = 3;

      /** Used as references for various `Number` constants. */
      var INFINITY = 1 / 0,
          MAX_SAFE_INTEGER = 9007199254740991,
          MAX_INTEGER = 1.7976931348623157e+308,
          NAN = 0 / 0;

      /** Used as references for the maximum length and index of an array. */
      var MAX_ARRAY_LENGTH = 4294967295,
          MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
          HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;

      /** Used to associate wrap methods with their bit flags. */
      var wrapFlags = [
        ['ary', WRAP_ARY_FLAG],
        ['bind', WRAP_BIND_FLAG],
        ['bindKey', WRAP_BIND_KEY_FLAG],
        ['curry', WRAP_CURRY_FLAG],
        ['curryRight', WRAP_CURRY_RIGHT_FLAG],
        ['flip', WRAP_FLIP_FLAG],
        ['partial', WRAP_PARTIAL_FLAG],
        ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
        ['rearg', WRAP_REARG_FLAG]
      ];

      /** `Object#toString` result references. */
      var argsTag = '[object Arguments]',
          arrayTag = '[object Array]',
          asyncTag = '[object AsyncFunction]',
          boolTag = '[object Boolean]',
          dateTag = '[object Date]',
          domExcTag = '[object DOMException]',
          errorTag = '[object Error]',
          funcTag = '[object Function]',
          genTag = '[object GeneratorFunction]',
          mapTag = '[object Map]',
          numberTag = '[object Number]',
          nullTag = '[object Null]',
          objectTag = '[object Object]',
          promiseTag = '[object Promise]',
          proxyTag = '[object Proxy]',
          regexpTag = '[object RegExp]',
          setTag = '[object Set]',
          stringTag = '[object String]',
          symbolTag = '[object Symbol]',
          undefinedTag = '[object Undefined]',
          weakMapTag = '[object WeakMap]',
          weakSetTag = '[object WeakSet]';

      var arrayBufferTag = '[object ArrayBuffer]',
          dataViewTag = '[object DataView]',
          float32Tag = '[object Float32Array]',
          float64Tag = '[object Float64Array]',
          int8Tag = '[object Int8Array]',
          int16Tag = '[object Int16Array]',
          int32Tag = '[object Int32Array]',
          uint8Tag = '[object Uint8Array]',
          uint8ClampedTag = '[object Uint8ClampedArray]',
          uint16Tag = '[object Uint16Array]',
          uint32Tag = '[object Uint32Array]';

      /** Used to match empty string literals in compiled template source. */
      var reEmptyStringLeading = /\b__p \+= '';/g,
          reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
          reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;

      /** Used to match HTML entities and HTML characters. */
      var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
          reUnescapedHtml = /[&<>"']/g,
          reHasEscapedHtml = RegExp(reEscapedHtml.source),
          reHasUnescapedHtml = RegExp(reUnescapedHtml.source);

      /** Used to match template delimiters. */
      var reEscape = /<%-([\s\S]+?)%>/g,
          reEvaluate = /<%([\s\S]+?)%>/g,
          reInterpolate = /<%=([\s\S]+?)%>/g;

      /** Used to match property names within property paths. */
      var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
          reIsPlainProp = /^\w*$/,
          reLeadingDot = /^\./,
          rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;

      /**
       * Used to match `RegExp`
       * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
       */
      var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
          reHasRegExpChar = RegExp(reRegExpChar.source);

      /** Used to match leading and trailing whitespace. */
      var reTrim = /^\s+|\s+$/g,
          reTrimStart = /^\s+/,
          reTrimEnd = /\s+$/;

      /** Used to match wrap detail comments. */
      var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
          reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
          reSplitDetails = /,? & /;

      /** Used to match words composed of alphanumeric characters. */
      var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;

      /** Used to match backslashes in property paths. */
      var reEscapeChar = /\\(\\)?/g;

      /**
       * Used to match
       * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
       */
      var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;

      /** Used to match `RegExp` flags from their coerced string values. */
      var reFlags = /\w*$/;

      /** Used to detect bad signed hexadecimal string values. */
      var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;

      /** Used to detect binary string values. */
      var reIsBinary = /^0b[01]+$/i;

      /** Used to detect host constructors (Safari). */
      var reIsHostCtor = /^\[object .+?Constructor\]$/;

      /** Used to detect octal string values. */
      var reIsOctal = /^0o[0-7]+$/i;

      /** Used to detect unsigned integer values. */
      var reIsUint = /^(?:0|[1-9]\d*)$/;

      /** Used to match Latin Unicode letters (excluding mathematical operators). */
      var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;

      /** Used to ensure capturing order of template delimiters. */
      var reNoMatch = /($^)/;

      /** Used to match unescaped characters in compiled string literals. */
      var reUnescapedString = /['\n\r\u2028\u2029\\]/g;

      /** Used to compose unicode character classes. */
      var rsAstralRange = '\\ud800-\\udfff',
          rsComboMarksRange = '\\u0300-\\u036f',
          reComboHalfMarksRange = '\\ufe20-\\ufe2f',
          rsComboSymbolsRange = '\\u20d0-\\u20ff',
          rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
          rsDingbatRange = '\\u2700-\\u27bf',
          rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
          rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
          rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
          rsPunctuationRange = '\\u2000-\\u206f',
          rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
          rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
          rsVarRange = '\\ufe0e\\ufe0f',
          rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;

      /** Used to compose unicode capture groups. */
      var rsApos = "['\u2019]",
          rsAstral = '[' + rsAstralRange + ']',
          rsBreak = '[' + rsBreakRange + ']',
          rsCombo = '[' + rsComboRange + ']',
          rsDigits = '\\d+',
          rsDingbat = '[' + rsDingbatRange + ']',
          rsLower = '[' + rsLowerRange + ']',
          rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
          rsFitz = '\\ud83c[\\udffb-\\udfff]',
          rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
          rsNonAstral = '[^' + rsAstralRange + ']',
          rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
          rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
          rsUpper = '[' + rsUpperRange + ']',
          rsZWJ = '\\u200d';

      /** Used to compose unicode regexes. */
      var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
          rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
          rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
          rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
          reOptMod = rsModifier + '?',
          rsOptVar = '[' + rsVarRange + ']?',
          rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
          rsOrdLower = '\\d*(?:(?:1st|2nd|3rd|(?![123])\\dth)\\b)',
          rsOrdUpper = '\\d*(?:(?:1ST|2ND|3RD|(?![123])\\dTH)\\b)',
          rsSeq = rsOptVar + reOptMod + rsOptJoin,
          rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
          rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';

      /** Used to match apostrophes. */
      var reApos = RegExp(rsApos, 'g');

      /**
       * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
       * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
       */
      var reComboMark = RegExp(rsCombo, 'g');

      /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
      var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');

      /** Used to match complex or compound words. */
      var reUnicodeWord = RegExp([
        rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
        rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
        rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
        rsUpper + '+' + rsOptContrUpper,
        rsOrdUpper,
        rsOrdLower,
        rsDigits,
        rsEmoji
      ].join('|'), 'g');

      /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
      var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange  + rsComboRange + rsVarRange + ']');

      /** Used to detect strings that need a more robust regexp to match words. */
      var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;

      /** Used to assign default `context` object properties. */
      var contextProps = [
        'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
        'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
        'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
        'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
        '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
      ];

      /** Used to make template sourceURLs easier to identify. */
      var templateCounter = -1;

      /** Used to identify `toStringTag` values of typed arrays. */
      var typedArrayTags = {};
      typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
      typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
      typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
      typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
      typedArrayTags[uint32Tag] = true;
      typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
      typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
      typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
      typedArrayTags[errorTag] = typedArrayTags[funcTag] =
      typedArrayTags[mapTag] = typedArrayTags[numberTag] =
      typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
      typedArrayTags[setTag] = typedArrayTags[stringTag] =
      typedArrayTags[weakMapTag] = false;

      /** Used to identify `toStringTag` values supported by `_.clone`. */
      var cloneableTags = {};
      cloneableTags[argsTag] = cloneableTags[arrayTag] =
      cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
      cloneableTags[boolTag] = cloneableTags[dateTag] =
      cloneableTags[float32Tag] = cloneableTags[float64Tag] =
      cloneableTags[int8Tag] = cloneableTags[int16Tag] =
      cloneableTags[int32Tag] = cloneableTags[mapTag] =
      cloneableTags[numberTag] = cloneableTags[objectTag] =
      cloneableTags[regexpTag] = cloneableTags[setTag] =
      cloneableTags[stringTag] = cloneableTags[symbolTag] =
      cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
      cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
      cloneableTags[errorTag] = cloneableTags[funcTag] =
      cloneableTags[weakMapTag] = false;

      /** Used to map Latin Unicode letters to basic Latin letters. */
      var deburredLetters = {
        // Latin-1 Supplement block.
        '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
        '\xe0': 'a',  '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
        '\xc7': 'C',  '\xe7': 'c',
        '\xd0': 'D',  '\xf0': 'd',
        '\xc8': 'E',  '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
        '\xe8': 'e',  '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
        '\xcc': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
        '\xec': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
        '\xd1': 'N',  '\xf1': 'n',
        '\xd2': 'O',  '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
        '\xf2': 'o',  '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
        '\xd9': 'U',  '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
        '\xf9': 'u',  '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
        '\xdd': 'Y',  '\xfd': 'y', '\xff': 'y',
        '\xc6': 'Ae', '\xe6': 'ae',
        '\xde': 'Th', '\xfe': 'th',
        '\xdf': 'ss',
        // Latin Extended-A block.
        '\u0100': 'A',  '\u0102': 'A', '\u0104': 'A',
        '\u0101': 'a',  '\u0103': 'a', '\u0105': 'a',
        '\u0106': 'C',  '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
        '\u0107': 'c',  '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
        '\u010e': 'D',  '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
        '\u0112': 'E',  '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
        '\u0113': 'e',  '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
        '\u011c': 'G',  '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
        '\u011d': 'g',  '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
        '\u0124': 'H',  '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
        '\u0128': 'I',  '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
        '\u0129': 'i',  '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
        '\u0134': 'J',  '\u0135': 'j',
        '\u0136': 'K',  '\u0137': 'k', '\u0138': 'k',
        '\u0139': 'L',  '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
        '\u013a': 'l',  '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
        '\u0143': 'N',  '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
        '\u0144': 'n',  '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
        '\u014c': 'O',  '\u014e': 'O', '\u0150': 'O',
        '\u014d': 'o',  '\u014f': 'o', '\u0151': 'o',
        '\u0154': 'R',  '\u0156': 'R', '\u0158': 'R',
        '\u0155': 'r',  '\u0157': 'r', '\u0159': 'r',
        '\u015a': 'S',  '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
        '\u015b': 's',  '\u015d': 's', '\u015f': 's', '\u0161': 's',
        '\u0162': 'T',  '\u0164': 'T', '\u0166': 'T',
        '\u0163': 't',  '\u0165': 't', '\u0167': 't',
        '\u0168': 'U',  '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
        '\u0169': 'u',  '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
        '\u0174': 'W',  '\u0175': 'w',
        '\u0176': 'Y',  '\u0177': 'y', '\u0178': 'Y',
        '\u0179': 'Z',  '\u017b': 'Z', '\u017d': 'Z',
        '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
        '\u0132': 'IJ', '\u0133': 'ij',
        '\u0152': 'Oe', '\u0153': 'oe',
        '\u0149': "'n", '\u017f': 's'
      };

      /** Used to map characters to HTML entities. */
      var htmlEscapes = {
        '&': '&amp;',
        '<': '&lt;',
        '>': '&gt;',
        '"': '&quot;',
        "'": '&#39;'
      };

      /** Used to map HTML entities to characters. */
      var htmlUnescapes = {
        '&amp;': '&',
        '&lt;': '<',
        '&gt;': '>',
        '&quot;': '"',
        '&#39;': "'"
      };

      /** Used to escape characters for inclusion in compiled string literals. */
      var stringEscapes = {
        '\\': '\\',
        "'": "'",
        '\n': 'n',
        '\r': 'r',
        '\u2028': 'u2028',
        '\u2029': 'u2029'
      };

      /** Built-in method references without a dependency on `root`. */
      var freeParseFloat = parseFloat,
          freeParseInt = parseInt;

      /** Detect free variable `global` from Node.js. */
      var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;

      /** Detect free variable `self`. */
      var freeSelf = typeof self == 'object' && self && self.Object === Object && self;

      /** Used as a reference to the global object. */
      var root = freeGlobal || freeSelf || Function('return this')();

      /** Detect free variable `exports`. */
      var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;

      /** Detect free variable `module`. */
      var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;

      /** Detect the popular CommonJS extension `module.exports`. */
      var moduleExports = freeModule && freeModule.exports === freeExports;

      /** Detect free variable `process` from Node.js. */
      var freeProcess = moduleExports && freeGlobal.process;

      /** Used to access faster Node.js helpers. */
      var nodeUtil = (function() {
        try {
          return freeProcess && freeProcess.binding && freeProcess.binding('util');
        } catch (e) {}
      }());

      /* Node.js helper references. */
      var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
          nodeIsDate = nodeUtil && nodeUtil.isDate,
          nodeIsMap = nodeUtil && nodeUtil.isMap,
          nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
          nodeIsSet = nodeUtil && nodeUtil.isSet,
          nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;

      /*--------------------------------------------------------------------------*/

      /**
       * Adds the key-value `pair` to `map`.
       *
       * @private
       * @param {Object} map The map to modify.
       * @param {Array} pair The key-value pair to add.
       * @returns {Object} Returns `map`.
       */
      function addMapEntry(map, pair) {
        // Don't return `map.set` because it's not chainable in IE 11.
        map.set(pair[0], pair[1]);
        return map;
      }

      /**
       * Adds `value` to `set`.
       *
       * @private
       * @param {Object} set The set to modify.
       * @param {*} value The value to add.
       * @returns {Object} Returns `set`.
       */
      function addSetEntry(set, value) {
        // Don't return `set.add` because it's not chainable in IE 11.
        set.add(value);
        return set;
      }

      /**
       * A faster alternative to `Function#apply`, this function invokes `func`
       * with the `this` binding of `thisArg` and the arguments of `args`.
       *
       * @private
       * @param {Function} func The function to invoke.
       * @param {*} thisArg The `this` binding of `func`.
       * @param {Array} args The arguments to invoke `func` with.
       * @returns {*} Returns the result of `func`.
       */
      function apply(func, thisArg, args) {
        switch (args.length) {
          case 0: return func.call(thisArg);
          case 1: return func.call(thisArg, args[0]);
          case 2: return func.call(thisArg, args[0], args[1]);
          case 3: return func.call(thisArg, args[0], args[1], args[2]);
        }
        return func.apply(thisArg, args);
      }

      /**
       * A specialized version of `baseAggregator` for arrays.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} setter The function to set `accumulator` values.
       * @param {Function} iteratee The iteratee to transform keys.
       * @param {Object} accumulator The initial aggregated object.
       * @returns {Function} Returns `accumulator`.
       */
      function arrayAggregator(array, setter, iteratee, accumulator) {
        var index = -1,
            length = array == null ? 0 : array.length;

        while (++index < length) {
          var value = array[index];
          setter(accumulator, value, iteratee(value), array);
        }
        return accumulator;
      }

      /**
       * A specialized version of `_.forEach` for arrays without support for
       * iteratee shorthands.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array} Returns `array`.
       */
      function arrayEach(array, iteratee) {
        var index = -1,
            length = array == null ? 0 : array.length;

        while (++index < length) {
          if (iteratee(array[index], index, array) === false) {
            break;
          }
        }
        return array;
      }

      /**
       * A specialized version of `_.forEachRight` for arrays without support for
       * iteratee shorthands.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array} Returns `array`.
       */
      function arrayEachRight(array, iteratee) {
        var length = array == null ? 0 : array.length;

        while (length--) {
          if (iteratee(array[length], length, array) === false) {
            break;
          }
        }
        return array;
      }

      /**
       * A specialized version of `_.every` for arrays without support for
       * iteratee shorthands.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {boolean} Returns `true` if all elements pass the predicate check,
       *  else `false`.
       */
      function arrayEvery(array, predicate) {
        var index = -1,
            length = array == null ? 0 : array.length;

        while (++index < length) {
          if (!predicate(array[index], index, array)) {
            return false;
          }
        }
        return true;
      }

      /**
       * A specialized version of `_.filter` for arrays without support for
       * iteratee shorthands.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {Array} Returns the new filtered array.
       */
      function arrayFilter(array, predicate) {
        var index = -1,
            length = array == null ? 0 : array.length,
            resIndex = 0,
            result = [];

        while (++index < length) {
          var value = array[index];
          if (predicate(value, index, array)) {
            result[resIndex++] = value;
          }
        }
        return result;
      }

      /**
       * A specialized version of `_.includes` for arrays without support for
       * specifying an index to search from.
       *
       * @private
       * @param {Array} [array] The array to inspect.
       * @param {*} target The value to search for.
       * @returns {boolean} Returns `true` if `target` is found, else `false`.
       */
      function arrayIncludes(array, value) {
        var length = array == null ? 0 : array.length;
        return !!length && baseIndexOf(array, value, 0) > -1;
      }

      /**
       * This function is like `arrayIncludes` except that it accepts a comparator.
       *
       * @private
       * @param {Array} [array] The array to inspect.
       * @param {*} target The value to search for.
       * @param {Function} comparator The comparator invoked per element.
       * @returns {boolean} Returns `true` if `target` is found, else `false`.
       */
      function arrayIncludesWith(array, value, comparator) {
        var index = -1,
            length = array == null ? 0 : array.length;

        while (++index < length) {
          if (comparator(value, array[index])) {
            return true;
          }
        }
        return false;
      }

      /**
       * A specialized version of `_.map` for arrays without support for iteratee
       * shorthands.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array} Returns the new mapped array.
       */
      function arrayMap(array, iteratee) {
        var index = -1,
            length = array == null ? 0 : array.length,
            result = Array(length);

        while (++index < length) {
          result[index] = iteratee(array[index], index, array);
        }
        return result;
      }

      /**
       * Appends the elements of `values` to `array`.
       *
       * @private
       * @param {Array} array The array to modify.
       * @param {Array} values The values to append.
       * @returns {Array} Returns `array`.
       */
      function arrayPush(array, values) {
        var index = -1,
            length = values.length,
            offset = array.length;

        while (++index < length) {
          array[offset + index] = values[index];
        }
        return array;
      }

      /**
       * A specialized version of `_.reduce` for arrays without support for
       * iteratee shorthands.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @param {*} [accumulator] The initial value.
       * @param {boolean} [initAccum] Specify using the first element of `array` as
       *  the initial value.
       * @returns {*} Returns the accumulated value.
       */
      function arrayReduce(array, iteratee, accumulator, initAccum) {
        var index = -1,
            length = array == null ? 0 : array.length;

        if (initAccum && length) {
          accumulator = array[++index];
        }
        while (++index < length) {
          accumulator = iteratee(accumulator, array[index], index, array);
        }
        return accumulator;
      }

      /**
       * A specialized version of `_.reduceRight` for arrays without support for
       * iteratee shorthands.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @param {*} [accumulator] The initial value.
       * @param {boolean} [initAccum] Specify using the last element of `array` as
       *  the initial value.
       * @returns {*} Returns the accumulated value.
       */
      function arrayReduceRight(array, iteratee, accumulator, initAccum) {
        var length = array == null ? 0 : array.length;
        if (initAccum && length) {
          accumulator = array[--length];
        }
        while (length--) {
          accumulator = iteratee(accumulator, array[length], length, array);
        }
        return accumulator;
      }

      /**
       * A specialized version of `_.some` for arrays without support for iteratee
       * shorthands.
       *
       * @private
       * @param {Array} [array] The array to iterate over.
       * @param {Function} predicate The function invoked per iteration.
       * @returns {boolean} Returns `true` if any element passes the predicate check,
       *  else `false`.
       */
      function arraySome(array, predicate) {
        var index = -1,
            length = array == null ? 0 : array.length;

        while (++index < length) {
          if (predicate(array[index], index, array)) {
            return true;
          }
        }
        return false;
      }

      /**
       * Gets the size of an ASCII `string`.
       *
       * @private
       * @param {string} string The string inspect.
       * @returns {number} Returns the string size.
       */
      var asciiSize = baseProperty('length');

      /**
       * Converts an ASCII `string` to an array.
       *
       * @private
       * @param {string} string The string to convert.
       * @returns {Array} Returns the converted array.
       */
      function asciiToArray(string) {
        return string.split('');
      }

      /**
       * Splits an ASCII `string` into an array of its words.
       *
       * @private
       * @param {string} The string to inspect.
       * @returns {Array} Returns the words of `string`.
       */
      function asciiWords(string) {
        return string.match(reAsciiWord) || [];
      }

      /**
       * The base implementation of methods like `_.findKey` and `_.findLastKey`,
       * without support for iteratee shorthands, which iterates over `collection`
       * using `eachFunc`.
       *
       * @private
       * @param {Array|Object} collection The collection to inspect.
       * @param {Function} predicate The function invoked per iteration.
       * @param {Function} eachFunc The function to iterate over `collection`.
       * @returns {*} Returns the found element or its key, else `undefined`.
       */
      function baseFindKey(collection, predicate, eachFunc) {
        var result;
        eachFunc(collection, function(value, key, collection) {
          if (predicate(value, key, collection)) {
            result = key;
            return false;
          }
        });
        return result;
      }

      /**
       * The base implementation of `_.findIndex` and `_.findLastIndex` without
       * support for iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {Function} predicate The function invoked per iteration.
       * @param {number} fromIndex The index to search from.
       * @param {boolean} [fromRight] Specify iterating from right to left.
       * @returns {number} Returns the index of the matched value, else `-1`.
       */
      function baseFindIndex(array, predicate, fromIndex, fromRight) {
        var length = array.length,
            index = fromIndex + (fromRight ? 1 : -1);

        while ((fromRight ? index-- : ++index < length)) {
          if (predicate(array[index], index, array)) {
            return index;
          }
        }
        return -1;
      }

      /**
       * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @param {number} fromIndex The index to search from.
       * @returns {number} Returns the index of the matched value, else `-1`.
       */
      function baseIndexOf(array, value, fromIndex) {
        return value === value
          ? strictIndexOf(array, value, fromIndex)
          : baseFindIndex(array, baseIsNaN, fromIndex);
      }

      /**
       * This function is like `baseIndexOf` except that it accepts a comparator.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @param {number} fromIndex The index to search from.
       * @param {Function} comparator The comparator invoked per element.
       * @returns {number} Returns the index of the matched value, else `-1`.
       */
      function baseIndexOfWith(array, value, fromIndex, comparator) {
        var index = fromIndex - 1,
            length = array.length;

        while (++index < length) {
          if (comparator(array[index], value)) {
            return index;
          }
        }
        return -1;
      }

      /**
       * The base implementation of `_.isNaN` without support for number objects.
       *
       * @private
       * @param {*} value The value to check.
       * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
       */
      function baseIsNaN(value) {
        return value !== value;
      }

      /**
       * The base implementation of `_.mean` and `_.meanBy` without support for
       * iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {number} Returns the mean.
       */
      function baseMean(array, iteratee) {
        var length = array == null ? 0 : array.length;
        return length ? (baseSum(array, iteratee) / length) : NAN;
      }

      /**
       * The base implementation of `_.property` without support for deep paths.
       *
       * @private
       * @param {string} key The key of the property to get.
       * @returns {Function} Returns the new accessor function.
       */
      function baseProperty(key) {
        return function(object) {
          return object == null ? undefined : object[key];
        };
      }

      /**
       * The base implementation of `_.propertyOf` without support for deep paths.
       *
       * @private
       * @param {Object} object The object to query.
       * @returns {Function} Returns the new accessor function.
       */
      function basePropertyOf(object) {
        return function(key) {
          return object == null ? undefined : object[key];
        };
      }

      /**
       * The base implementation of `_.reduce` and `_.reduceRight`, without support
       * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
       *
       * @private
       * @param {Array|Object} collection The collection to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @param {*} accumulator The initial value.
       * @param {boolean} initAccum Specify using the first or last element of
       *  `collection` as the initial value.
       * @param {Function} eachFunc The function to iterate over `collection`.
       * @returns {*} Returns the accumulated value.
       */
      function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
        eachFunc(collection, function(value, index, collection) {
          accumulator = initAccum
            ? (initAccum = false, value)
            : iteratee(accumulator, value, index, collection);
        });
        return accumulator;
      }

      /**
       * The base implementation of `_.sortBy` which uses `comparer` to define the
       * sort order of `array` and replaces criteria objects with their corresponding
       * values.
       *
       * @private
       * @param {Array} array The array to sort.
       * @param {Function} comparer The function to define sort order.
       * @returns {Array} Returns `array`.
       */
      function baseSortBy(array, comparer) {
        var length = array.length;

        array.sort(comparer);
        while (length--) {
          array[length] = array[length].value;
        }
        return array;
      }

      /**
       * The base implementation of `_.sum` and `_.sumBy` without support for
       * iteratee shorthands.
       *
       * @private
       * @param {Array} array The array to iterate over.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {number} Returns the sum.
       */
      function baseSum(array, iteratee) {
        var result,
            index = -1,
            length = array.length;

        while (++index < length) {
          var current = iteratee(array[index]);
          if (current !== undefined) {
            result = result === undefined ? current : (result + current);
          }
        }
        return result;
      }

      /**
       * The base implementation of `_.times` without support for iteratee shorthands
       * or max array length checks.
       *
       * @private
       * @param {number} n The number of times to invoke `iteratee`.
       * @param {Function} iteratee The function invoked per iteration.
       * @returns {Array} Returns the array of results.
       */
      function baseTimes(n, iteratee) {
        var index = -1,
            result = Array(n);

        while (++index < n) {
          result[index] = iteratee(index);
        }
        return result;
      }

      /**
       * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
       * of key-value pairs for `object` corresponding to the property names of `props`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array} props The property names to get values for.
       * @returns {Object} Returns the key-value pairs.
       */
      function baseToPairs(object, props) {
        return arrayMap(props, function(key) {
          return [key, object[key]];
        });
      }

      /**
       * The base implementation of `_.unary` without support for storing metadata.
       *
       * @private
       * @param {Function} func The function to cap arguments for.
       * @returns {Function} Returns the new capped function.
       */
      function baseUnary(func) {
        return function(value) {
          return func(value);
        };
      }

      /**
       * The base implementation of `_.values` and `_.valuesIn` which creates an
       * array of `object` property values corresponding to the property names
       * of `props`.
       *
       * @private
       * @param {Object} object The object to query.
       * @param {Array} props The property names to get values for.
       * @returns {Object} Returns the array of property values.
       */
      function baseValues(object, props) {
        return arrayMap(props, function(key) {
          return object[key];
        });
      }

      /**
       * Checks if a `cache` value for `key` exists.
       *
       * @private
       * @param {Object} cache The cache to query.
       * @param {string} key The key of the entry to check.
       * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
       */
      function cacheHas(cache, key) {
        return cache.has(key);
      }

      /**
       * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
       * that is not found in the character symbols.
       *
       * @private
       * @param {Array} strSymbols The string symbols to inspect.
       * @param {Array} chrSymbols The character symbols to find.
       * @returns {number} Returns the index of the first unmatched string symbol.
       */
      function charsStartIndex(strSymbols, chrSymbols) {
        var index = -1,
            length = strSymbols.length;

        while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
        return index;
      }

      /**
       * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
       * that is not found in the character symbols.
       *
       * @private
       * @param {Array} strSymbols The string symbols to inspect.
       * @param {Array} chrSymbols The character symbols to find.
       * @returns {number} Returns the index of the last unmatched string symbol.
       */
      function charsEndIndex(strSymbols, chrSymbols) {
        var index = strSymbols.length;

        while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
        return index;
      }

      /**
       * Gets the number of `placeholder` occurrences in `array`.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {*} placeholder The placeholder to search for.
       * @returns {number} Returns the placeholder count.
       */
      function countHolders(array, placeholder) {
        var length = array.length,
            result = 0;

        while (length--) {
          if (array[length] === placeholder) {
            ++result;
          }
        }
        return result;
      }

      /**
       * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
       * letters to basic Latin letters.
       *
       * @private
       * @param {string} letter The matched letter to deburr.
       * @returns {string} Returns the deburred letter.
       */
      var deburrLetter = basePropertyOf(deburredLetters);

      /**
       * Used by `_.escape` to convert characters to HTML entities.
       *
       * @private
       * @param {string} chr The matched character to escape.
       * @returns {string} Returns the escaped character.
       */
      var escapeHtmlChar = basePropertyOf(htmlEscapes);

      /**
       * Used by `_.template` to escape characters for inclusion in compiled string literals.
       *
       * @private
       * @param {string} chr The matched character to escape.
       * @returns {string} Returns the escaped character.
       */
      function escapeStringChar(chr) {
        return '\\' + stringEscapes[chr];
      }

      /**
       * Gets the value at `key` of `object`.
       *
       * @private
       * @param {Object} [object] The object to query.
       * @param {string} key The key of the property to get.
       * @returns {*} Returns the property value.
       */
      function getValue(object, key) {
        return object == null ? undefined : object[key];
      }

      /**
       * Checks if `string` contains Unicode symbols.
       *
       * @private
       * @param {string} string The string to inspect.
       * @returns {boolean} Returns `true` if a symbol is found, else `false`.
       */
      function hasUnicode(string) {
        return reHasUnicode.test(string);
      }

      /**
       * Checks if `string` contains a word composed of Unicode symbols.
       *
       * @private
       * @param {string} string The string to inspect.
       * @returns {boolean} Returns `true` if a word is found, else `false`.
       */
      function hasUnicodeWord(string) {
        return reHasUnicodeWord.test(string);
      }

      /**
       * Converts `iterator` to an array.
       *
       * @private
       * @param {Object} iterator The iterator to convert.
       * @returns {Array} Returns the converted array.
       */
      function iteratorToArray(iterator) {
        var data,
            result = [];

        while (!(data = iterator.next()).done) {
          result.push(data.value);
        }
        return result;
      }

      /**
       * Converts `map` to its key-value pairs.
       *
       * @private
       * @param {Object} map The map to convert.
       * @returns {Array} Returns the key-value pairs.
       */
      function mapToArray(map) {
        var index = -1,
            result = Array(map.size);

        map.forEach(function(value, key) {
          result[++index] = [key, value];
        });
        return result;
      }

      /**
       * Creates a unary function that invokes `func` with its argument transformed.
       *
       * @private
       * @param {Function} func The function to wrap.
       * @param {Function} transform The argument transform.
       * @returns {Function} Returns the new function.
       */
      function overArg(func, transform) {
        return function(arg) {
          return func(transform(arg));
        };
      }

      /**
       * Replaces all `placeholder` elements in `array` with an internal placeholder
       * and returns an array of their indexes.
       *
       * @private
       * @param {Array} array The array to modify.
       * @param {*} placeholder The placeholder to replace.
       * @returns {Array} Returns the new array of placeholder indexes.
       */
      function replaceHolders(array, placeholder) {
        var index = -1,
            length = array.length,
            resIndex = 0,
            result = [];

        while (++index < length) {
          var value = array[index];
          if (value === placeholder || value === PLACEHOLDER) {
            array[index] = PLACEHOLDER;
            result[resIndex++] = index;
          }
        }
        return result;
      }

      /**
       * Converts `set` to an array of its values.
       *
       * @private
       * @param {Object} set The set to convert.
       * @returns {Array} Returns the values.
       */
      function setToArray(set) {
        var index = -1,
            result = Array(set.size);

        set.forEach(function(value) {
          result[++index] = value;
        });
        return result;
      }

      /**
       * Converts `set` to its value-value pairs.
       *
       * @private
       * @param {Object} set The set to convert.
       * @returns {Array} Returns the value-value pairs.
       */
      function setToPairs(set) {
        var index = -1,
            result = Array(set.size);

        set.forEach(function(value) {
          result[++index] = [value, value];
        });
        return result;
      }

      /**
       * A specialized version of `_.indexOf` which performs strict equality
       * comparisons of values, i.e. `===`.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @param {number} fromIndex The index to search from.
       * @returns {number} Returns the index of the matched value, else `-1`.
       */
      function strictIndexOf(array, value, fromIndex) {
        var index = fromIndex - 1,
            length = array.length;

        while (++index < length) {
          if (array[index] === value) {
            return index;
          }
        }
        return -1;
      }

      /**
       * A specialized version of `_.lastIndexOf` which performs strict equality
       * comparisons of values, i.e. `===`.
       *
       * @private
       * @param {Array} array The array to inspect.
       * @param {*} value The value to search for.
       * @param {number} fromIndex The index to search from.
       * @returns {number} Returns the index of the matched value, else `-1`.
       */
      function strictLastIndexOf(array, value, fromIndex) {
        var index = fromIndex + 1;
        while (index--) {
          if (array[index] === value) {
            return index;
          }
        }
        return index;
      }

      /**
       * Gets the number of symbols in `string`.
       *
       * @private
       * @param {string} string The string to inspect.
       * @returns {number} Returns the string size.
       */
      function stringSize(string) {
        return hasUnicode(string)
          ? unicodeSize(string)
          : asciiSize(string);
      }

      /**
       * Converts `string` to an array.
       *
       * @private
       * @param {string} string The string to convert.
       * @returns {Array} Returns the converted array.
       */
      function stringToArray(string) {
        return hasUnicode(string)
          ? unicodeToArray(string)
          : asciiToArray(string);
      }

      /**
       * Used by `_.unescape` to convert HTML entities to characters.
       *
       * @private
       * @param {string} chr The matched character to unescape.
       * @returns {string} Returns the unescaped character.
       */
      var unescapeHtmlChar = basePropertyOf(htmlUnescapes);

      /**
       * Gets the size of a Unicode `string`.
       *
       * @private
       * @param {string} string The string inspect.
       * @returns {number} Returns the string size.
       */
      function unicodeSize(string) {
        var result = reUnicode.lastIndex = 0;
        while (reUnicode.test(string)) {
          ++result;
        }
        return result;
      }

      /**
       * Converts a Unicode `string` to an array.
       *
       * @private
       * @param {string} string The string to convert.
       * @returns {Array} Returns the converted array.
       */
      function unicodeToArray(string) {
        return string.match(reUnicode) || [];
      }

      /**
       * Splits a Unicode `string` into an array of its words.
       *
       * @private
       * @param {string} The string to inspect.
       * @returns {Array} Returns the words of `string`.
       */
      function unicodeWords(string) {
        return string.match(reUnicodeWord) || [];
      }

      /*--------------------------------------------------------------------------*/

      /**
       * Create a new pristine `lodash` function using the `context` object.
       *
       * @static
       * @memberOf _
       * @since 1.1.0
       * @category Util
       * @param {Object} [context=root] The context object.
       * @returns {Function} Returns a new `lodash` function.
       * @example
       *
       * _.mixin({ 'foo': _.constant('foo') });
       *
       * var lodash = _.runInContext();
       * lodash.mixin({ 'bar': lodash.constant('bar') });
       *
       * _.isFunction(_.foo);
       * // => true
       * _.isFunction(_.bar);
       * // => false
       *
       * lodash.isFunction(lodash.foo);
       * // => false
       * lodash.isFunction(lodash.bar);
       * // => true
       *
       * // Create a suped-up `defer` in Node.js.
       * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
       */
      var runInContext = (function runInContext(context) {
        context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));

        /** Built-in constructor references. */
        var Array = context.Array,
            Date = context.Date,
            Error = context.Error,
            Function = context.Function,
            Math = context.Math,
            Object = context.Object,
            RegExp = context.RegExp,
            String = context.String,
            TypeError = context.TypeError;

        /** Used for built-in method references. */
        var arrayProto = Array.prototype,
            funcProto = Function.prototype,
            objectProto = Object.prototype;

        /** Used to detect overreaching core-js shims. */
        var coreJsData = context['__core-js_shared__'];

        /** Used to resolve the decompiled source of functions. */
        var funcToString = funcProto.toString;

        /** Used to check objects for own properties. */
        var hasOwnProperty = objectProto.hasOwnProperty;

        /** Used to generate unique IDs. */
        var idCounter = 0;

        /** Used to detect methods masquerading as native. */
        var maskSrcKey = (function() {
          var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
          return uid ? ('Symbol(src)_1.' + uid) : '';
        }());

        /**
         * Used to resolve the
         * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
         * of values.
         */
        var nativeObjectToString = objectProto.toString;

        /** Used to infer the `Object` constructor. */
        var objectCtorString = funcToString.call(Object);

        /** Used to restore the original `_` reference in `_.noConflict`. */
        var oldDash = root._;

        /** Used to detect if a method is native. */
        var reIsNative = RegExp('^' +
          funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
          .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
        );

        /** Built-in value references. */
        var Buffer = moduleExports ? context.Buffer : undefined,
            Symbol = context.Symbol,
            Uint8Array = context.Uint8Array,
            allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
            getPrototype = overArg(Object.getPrototypeOf, Object),
            objectCreate = Object.create,
            propertyIsEnumerable = objectProto.propertyIsEnumerable,
            splice = arrayProto.splice,
            spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
            symIterator = Symbol ? Symbol.iterator : undefined,
            symToStringTag = Symbol ? Symbol.toStringTag : undefined;

        var defineProperty = (function() {
          try {
            var func = getNative(Object, 'defineProperty');
            func({}, '', {});
            return func;
          } catch (e) {}
        }());

        /** Mocked built-ins. */
        var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
            ctxNow = Date && Date.now !== root.Date.now && Date.now,
            ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;

        /* Built-in method references for those with the same name as other `lodash` methods. */
        var nativeCeil = Math.ceil,
            nativeFloor = Math.floor,
            nativeGetSymbols = Object.getOwnPropertySymbols,
            nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
            nativeIsFinite = context.isFinite,
            nativeJoin = arrayProto.join,
            nativeKeys = overArg(Object.keys, Object),
            nativeMax = Math.max,
            nativeMin = Math.min,
            nativeNow = Date.now,
            nativeParseInt = context.parseInt,
            nativeRandom = Math.random,
            nativeReverse = arrayProto.reverse;

        /* Built-in method references that are verified to be native. */
        var DataView = getNative(context, 'DataView'),
            Map = getNative(context, 'Map'),
            Promise = getNative(context, 'Promise'),
            Set = getNative(context, 'Set'),
            WeakMap = getNative(context, 'WeakMap'),
            nativeCreate = getNative(Object, 'create');

        /** Used to store function metadata. */
        var metaMap = WeakMap && new WeakMap;

        /** Used to lookup unminified function names. */
        var realNames = {};

        /** Used to detect maps, sets, and weakmaps. */
        var dataViewCtorString = toSource(DataView),
            mapCtorString = toSource(Map),
            promiseCtorString = toSource(Promise),
            setCtorString = toSource(Set),
            weakMapCtorString = toSource(WeakMap);

        /** Used to convert symbols to primitives and strings. */
        var symbolProto = Symbol ? Symbol.prototype : undefined,
            symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
            symbolToString = symbolProto ? symbolProto.toString : undefined;

        /*------------------------------------------------------------------------*/

        /**
         * Creates a `lodash` object which wraps `value` to enable implicit method
         * chain sequences. Methods that operate on and return arrays, collections,
         * and functions can be chained together. Methods that retrieve a single value
         * or may return a primitive value will automatically end the chain sequence
         * and return the unwrapped value. Otherwise, the value must be unwrapped
         * with `_#value`.
         *
         * Explicit chain sequences, which must be unwrapped with `_#value`, may be
         * enabled using `_.chain`.
         *
         * The execution of chained methods is lazy, that is, it's deferred until
         * `_#value` is implicitly or explicitly called.
         *
         * Lazy evaluation allows several methods to support shortcut fusion.
         * Shortcut fusion is an optimization to merge iteratee calls; this avoids
         * the creation of intermediate arrays and can greatly reduce the number of
         * iteratee executions. Sections of a chain sequence qualify for shortcut
         * fusion if the section is applied to an array and iteratees accept only
         * one argument. The heuristic for whether a section qualifies for shortcut
         * fusion is subject to change.
         *
         * Chaining is supported in custom builds as long as the `_#value` method is
         * directly or indirectly included in the build.
         *
         * In addition to lodash methods, wrappers have `Array` and `String` methods.
         *
         * The wrapper `Array` methods are:
         * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
         *
         * The wrapper `String` methods are:
         * `replace` and `split`
         *
         * The wrapper methods that support shortcut fusion are:
         * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
         * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
         * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
         *
         * The chainable wrapper methods are:
         * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
         * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
         * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
         * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
         * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
         * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
         * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
         * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
         * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
         * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
         * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
         * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
         * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
         * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
         * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
         * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
         * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
         * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
         * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
         * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
         * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
         * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
         * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
         * `zipObject`, `zipObjectDeep`, and `zipWith`
         *
         * The wrapper methods that are **not** chainable by default are:
         * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
         * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
         * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
         * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
         * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
         * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
         * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
         * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
         * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
         * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
         * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
         * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
         * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
         * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
         * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
         * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
         * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
         * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
         * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
         * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
         * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
         * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
         * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
         * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
         * `upperFirst`, `value`, and `words`
         *
         * @name _
         * @constructor
         * @category Seq
         * @param {*} value The value to wrap in a `lodash` instance.
         * @returns {Object} Returns the new `lodash` wrapper instance.
         * @example
         *
         * function square(n) {
         *   return n * n;
         * }
         *
         * var wrapped = _([1, 2, 3]);
         *
         * // Returns an unwrapped value.
         * wrapped.reduce(_.add);
         * // => 6
         *
         * // Returns a wrapped value.
         * var squares = wrapped.map(square);
         *
         * _.isArray(squares);
         * // => false
         *
         * _.isArray(squares.value());
         * // => true
         */
        function lodash(value) {
          if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
            if (value instanceof LodashWrapper) {
              return value;
            }
            if (hasOwnProperty.call(value, '__wrapped__')) {
              return wrapperClone(value);
            }
          }
          return new LodashWrapper(value);
        }

        /**
         * The base implementation of `_.create` without support for assigning
         * properties to the created object.
         *
         * @private
         * @param {Object} proto The object to inherit from.
         * @returns {Object} Returns the new object.
         */
        var baseCreate = (function() {
          function object() {}
          return function(proto) {
            if (!isObject(proto)) {
              return {};
            }
            if (objectCreate) {
              return objectCreate(proto);
            }
            object.prototype = proto;
            var result = new object;
            object.prototype = undefined;
            return result;
          };
        }());

        /**
         * The function whose prototype chain sequence wrappers inherit from.
         *
         * @private
         */
        function baseLodash() {
          // No operation performed.
        }

        /**
         * The base constructor for creating `lodash` wrapper objects.
         *
         * @private
         * @param {*} value The value to wrap.
         * @param {boolean} [chainAll] Enable explicit method chain sequences.
         */
        function LodashWrapper(value, chainAll) {
          this.__wrapped__ = value;
          this.__actions__ = [];
          this.__chain__ = !!chainAll;
          this.__index__ = 0;
          this.__values__ = undefined;
        }

        /**
         * By default, the template delimiters used by lodash are like those in
         * embedded Ruby (ERB) as well as ES2015 template strings. Change the
         * following template settings to use alternative delimiters.
         *
         * @static
         * @memberOf _
         * @type {Object}
         */
        lodash.templateSettings = {

          /**
           * Used to detect `data` property values to be HTML-escaped.
           *
           * @memberOf _.templateSettings
           * @type {RegExp}
           */
          'escape': reEscape,

          /**
           * Used to detect code to be evaluated.
           *
           * @memberOf _.templateSettings
           * @type {RegExp}
           */
          'evaluate': reEvaluate,

          /**
           * Used to detect `data` property values to inject.
           *
           * @memberOf _.templateSettings
           * @type {RegExp}
           */
          'interpolate': reInterpolate,

          /**
           * Used to reference the data object in the template text.
           *
           * @memberOf _.templateSettings
           * @type {string}
           */
          'variable': '',

          /**
           * Used to import variables into the compiled template.
           *
           * @memberOf _.templateSettings
           * @type {Object}
           */
          'imports': {

            /**
             * A reference to the `lodash` function.
             *
             * @memberOf _.templateSettings.imports
             * @type {Function}
             */
            '_': lodash
          }
        };

        // Ensure wrappers are instances of `baseLodash`.
        lodash.prototype = baseLodash.prototype;
        lodash.prototype.constructor = lodash;

        LodashWrapper.prototype = baseCreate(baseLodash.prototype);
        LodashWrapper.prototype.constructor = LodashWrapper;

        /*------------------------------------------------------------------------*/

        /**
         * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
         *
         * @private
         * @constructor
         * @param {*} value The value to wrap.
         */
        function LazyWrapper(value) {
          this.__wrapped__ = value;
          this.__actions__ = [];
          this.__dir__ = 1;
          this.__filtered__ = false;
          this.__iteratees__ = [];
          this.__takeCount__ = MAX_ARRAY_LENGTH;
          this.__views__ = [];
        }

        /**
         * Creates a clone of the lazy wrapper object.
         *
         * @private
         * @name clone
         * @memberOf LazyWrapper
         * @returns {Object} Returns the cloned `LazyWrapper` object.
         */
        function lazyClone() {
          var result = new LazyWrapper(this.__wrapped__);
          result.__actions__ = copyArray(this.__actions__);
          result.__dir__ = this.__dir__;
          result.__filtered__ = this.__filtered__;
          result.__iteratees__ = copyArray(this.__iteratees__);
          result.__takeCount__ = this.__takeCount__;
          result.__views__ = copyArray(this.__views__);
          return result;
        }

        /**
         * Reverses the direction of lazy iteration.
         *
         * @private
         * @name reverse
         * @memberOf LazyWrapper
         * @returns {Object} Returns the new reversed `LazyWrapper` object.
         */
        function lazyReverse() {
          if (this.__filtered__) {
            var result = new LazyWrapper(this);
            result.__dir__ = -1;
            result.__filtered__ = true;
          } else {
            result = this.clone();
            result.__dir__ *= -1;
          }
          return result;
        }

        /**
         * Extracts the unwrapped value from its lazy wrapper.
         *
         * @private
         * @name value
         * @memberOf LazyWrapper
         * @returns {*} Returns the unwrapped value.
         */
        function lazyValue() {
          var array = this.__wrapped__.value(),
              dir = this.__dir__,
              isArr = isArray(array),
              isRight = dir < 0,
              arrLength = isArr ? array.length : 0,
              view = getView(0, arrLength, this.__views__),
              start = view.start,
              end = view.end,
              length = end - start,
              index = isRight ? end : (start - 1),
              iteratees = this.__iteratees__,
              iterLength = iteratees.length,
              resIndex = 0,
              takeCount = nativeMin(length, this.__takeCount__);

          if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
            return baseWrapperValue(array, this.__actions__);
          }
          var result = [];

          outer:
          while (length-- && resIndex < takeCount) {
            index += dir;

            var iterIndex = -1,
                value = array[index];

            while (++iterIndex < iterLength) {
              var data = iteratees[iterIndex],
                  iteratee = data.iteratee,
                  type = data.type,
                  computed = iteratee(value);

              if (type == LAZY_MAP_FLAG) {
                value = computed;
              } else if (!computed) {
                if (type == LAZY_FILTER_FLAG) {
                  continue outer;
                } else {
                  break outer;
                }
              }
            }
            result[resIndex++] = value;
          }
          return result;
        }

        // Ensure `LazyWrapper` is an instance of `baseLodash`.
        LazyWrapper.prototype = baseCreate(baseLodash.prototype);
        LazyWrapper.prototype.constructor = LazyWrapper;

        /*------------------------------------------------------------------------*/

        /**
         * Creates a hash object.
         *
         * @private
         * @constructor
         * @param {Array} [entries] The key-value pairs to cache.
         */
        function Hash(entries) {
          var index = -1,
              length = entries == null ? 0 : entries.length;

          this.clear();
          while (++index < length) {
            var entry = entries[index];
            this.set(entry[0], entry[1]);
          }
        }

        /**
         * Removes all key-value entries from the hash.
         *
         * @private
         * @name clear
         * @memberOf Hash
         */
        function hashClear() {
          this.__data__ = nativeCreate ? nativeCreate(null) : {};
          this.size = 0;
        }

        /**
         * Removes `key` and its value from the hash.
         *
         * @private
         * @name delete
         * @memberOf Hash
         * @param {Object} hash The hash to modify.
         * @param {string} key The key of the value to remove.
         * @returns {boolean} Returns `true` if the entry was removed, else `false`.
         */
        function hashDelete(key) {
          var result = this.has(key) && delete this.__data__[key];
          this.size -= result ? 1 : 0;
          return result;
        }

        /**
         * Gets the hash value for `key`.
         *
         * @private
         * @name get
         * @memberOf Hash
         * @param {string} key The key of the value to get.
         * @returns {*} Returns the entry value.
         */
        function hashGet(key) {
          var data = this.__data__;
          if (nativeCreate) {
            var result = data[key];
            return result === HASH_UNDEFINED ? undefined : result;
          }
          return hasOwnProperty.call(data, key) ? data[key] : undefined;
        }

        /**
         * Checks if a hash value for `key` exists.
         *
         * @private
         * @name has
         * @memberOf Hash
         * @param {string} key The key of the entry to check.
         * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
         */
        function hashHas(key) {
          var data = this.__data__;
          return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
        }

        /**
         * Sets the hash `key` to `value`.
         *
         * @private
         * @name set
         * @memberOf Hash
         * @param {string} key The key of the value to set.
         * @param {*} value The value to set.
         * @returns {Object} Returns the hash instance.
         */
        function hashSet(key, value) {
          var data = this.__data__;
          this.size += this.has(key) ? 0 : 1;
          data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
          return this;
        }

        // Add methods to `Hash`.
        Hash.prototype.clear = hashClear;
        Hash.prototype['delete'] = hashDelete;
        Hash.prototype.get = hashGet;
        Hash.prototype.has = hashHas;
        Hash.prototype.set = hashSet;

        /*------------------------------------------------------------------------*/

        /**
         * Creates an list cache object.
         *
         * @private
         * @constructor
         * @param {Array} [entries] The key-value pairs to cache.
         */
        function ListCache(entries) {
          var index = -1,
              length = entries == null ? 0 : entries.length;

          this.clear();
          while (++index < length) {
            var entry = entries[index];
            this.set(entry[0], entry[1]);
          }
        }

        /**
         * Removes all key-value entries from the list cache.
         *
         * @private
         * @name clear
         * @memberOf ListCache
         */
        function listCacheClear() {
          this.__data__ = [];
          this.size = 0;
        }

        /**
         * Removes `key` and its value from the list cache.
         *
         * @private
         * @name delete
         * @memberOf ListCache
         * @param {string} key The key of the value to remove.
         * @returns {boolean} Returns `true` if the entry was removed, else `false`.
         */
        function listCacheDelete(key) {
          var data = this.__data__,
              index = assocIndexOf(data, key);

          if (index < 0) {
            return false;
          }
          var lastIndex = data.length - 1;
          if (index == lastIndex) {
            data.pop();
          } else {
            splice.call(data, index, 1);
          }
          --this.size;
          return true;
        }

        /**
         * Gets the list cache value for `key`.
         *
         * @private
         * @name get
         * @memberOf ListCache
         * @param {string} key The key of the value to get.
         * @returns {*} Returns the entry value.
         */
        function listCacheGet(key) {
          var data = this.__data__,
              index = assocIndexOf(data, key);

          return index < 0 ? undefined : data[index][1];
        }

        /**
         * Checks if a list cache value for `key` exists.
         *
         * @private
         * @name has
         * @memberOf ListCache
         * @param {string} key The key of the entry to check.
         * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
         */
        function listCacheHas(key) {
          return assocIndexOf(this.__data__, key) > -1;
        }

        /**
         * Sets the list cache `key` to `value`.
         *
         * @private
         * @name set
         * @memberOf ListCache
         * @param {string} key The key of the value to set.
         * @param {*} value The value to set.
         * @returns {Object} Returns the list cache instance.
         */
        function listCacheSet(key, value) {
          var data = this.__data__,
              index = assocIndexOf(data, key);

          if (index < 0) {
            ++this.size;
            data.push([key, value]);
          } else {
            data[index][1] = value;
          }
          return this;
        }

        // Add methods to `ListCache`.
        ListCache.prototype.clear = listCacheClear;
        ListCache.prototype['delete'] = listCacheDelete;
        ListCache.prototype.get = listCacheGet;
        ListCache.prototype.has = listCacheHas;
        ListCache.prototype.set = listCacheSet;

        /*------------------------------------------------------------------------*/

        /**
         * Creates a map cache object to store key-value pairs.
         *
         * @private
         * @constructor
         * @param {Array} [entries] The key-value pairs to cache.
         */
        function MapCache(entries) {
          var index = -1,
              length = entries == null ? 0 : entries.length;

          this.clear();
          while (++index < length) {
            var entry = entries[index];
            this.set(entry[0], entry[1]);
          }
        }

        /**
         * Removes all key-value entries from the map.
         *
         * @private
         * @name clear
         * @memberOf MapCache
         */
        function mapCacheClear() {
          this.size = 0;
          this.__data__ = {
            'hash': new Hash,
            'map': new (Map || ListCache),
            'string': new Hash
          };
        }

        /**
         * Removes `key` and its value from the map.
         *
         * @private
         * @name delete
         * @memberOf MapCache
         * @param {string} key The key of the value to remove.
         * @returns {boolean} Returns `true` if the entry was removed, else `false`.
         */
        function mapCacheDelete(key) {
          var result = getMapData(this, key)['delete'](key);
          this.size -= result ? 1 : 0;
          return result;
        }

        /**
         * Gets the map value for `key`.
         *
         * @private
         * @name get
         * @memberOf MapCache
         * @param {string} key The key of the value to get.
         * @returns {*} Returns the entry value.
         */
        function mapCacheGet(key) {
          return getMapData(this, key).get(key);
        }

        /**
         * Checks if a map value for `key` exists.
         *
         * @private
         * @name has
         * @memberOf MapCache
         * @param {string} key The key of the entry to check.
         * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
         */
        function mapCacheHas(key) {
          return getMapData(this, key).has(key);
        }

        /**
         * Sets the map `key` to `value`.
         *
         * @private
         * @name set
         * @memberOf MapCache
         * @param {string} key The key of the value to set.
         * @param {*} value The value to set.
         * @returns {Object} Returns the map cache instance.
         */
        function mapCacheSet(key, value) {
          var data = getMapData(this, key),
              size = data.size;

          data.set(key, value);
          this.size += data.size == size ? 0 : 1;
          return this;
        }

        // Add methods to `MapCache`.
        MapCache.prototype.clear = mapCacheClear;
        MapCache.prototype['delete'] = mapCacheDelete;
        MapCache.prototype.get = mapCacheGet;
        MapCache.prototype.has = mapCacheHas;
        MapCache.prototype.set = mapCacheSet;

        /*------------------------------------------------------------------------*/

        /**
         *
         * Creates an array cache object to store unique values.
         *
         * @private
         * @constructor
         * @param {Array} [values] The values to cache.
         */
        function SetCache(values) {
          var index = -1,
              length = values == null ? 0 : values.length;

          this.__data__ = new MapCache;
          while (++index < length) {
            this.add(values[index]);
          }
        }

        /**
         * Adds `value` to the array cache.
         *
         * @private
         * @name add
         * @memberOf SetCache
         * @alias push
         * @param {*} value The value to cache.
         * @returns {Object} Returns the cache instance.
         */
        function setCacheAdd(value) {
          this.__data__.set(value, HASH_UNDEFINED);
          return this;
        }

        /**
         * Checks if `value` is in the array cache.
         *
         * @private
         * @name has
         * @memberOf SetCache
         * @param {*} value The value to search for.
         * @returns {number} Returns `true` if `value` is found, else `false`.
         */
        function setCacheHas(value) {
          return this.__data__.has(value);
        }

        // Add methods to `SetCache`.
        SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
        SetCache.prototype.has = setCacheHas;

        /*------------------------------------------------------------------------*/

        /**
         * Creates a stack cache object to store key-value pairs.
         *
         * @private
         * @constructor
         * @param {Array} [entries] The key-value pairs to cache.
         */
        function Stack(entries) {
          var data = this.__data__ = new ListCache(entries);
          this.size = data.size;
        }

        /**
         * Removes all key-value entries from the stack.
         *
         * @private
         * @name clear
         * @memberOf Stack
         */
        function stackClear() {
          this.__data__ = new ListCache;
          this.size = 0;
        }

        /**
         * Removes `key` and its value from the stack.
         *
         * @private
         * @name delete
         * @memberOf Stack
         * @param {string} key The key of the value to remove.
         * @returns {boolean} Returns `true` if the entry was removed, else `false`.
         */
        function stackDelete(key) {
          var data = this.__data__,
              result = data['delete'](key);

          this.size = data.size;
          return result;
        }

        /**
         * Gets the stack value for `key`.
         *
         * @private
         * @name get
         * @memberOf Stack
         * @param {string} key The key of the value to get.
         * @returns {*} Returns the entry value.
         */
        function stackGet(key) {
          return this.__data__.get(key);
        }

        /**
         * Checks if a stack value for `key` exists.
         *
         * @private
         * @name has
         * @memberOf Stack
         * @param {string} key The key of the entry to check.
         * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
         */
        function stackHas(key) {
          return this.__data__.has(key);
        }

        /**
         * Sets the stack `key` to `value`.
         *
         * @private
         * @name set
         * @memberOf Stack
         * @param {string} key The key of the value to set.
         * @param {*} value The value to set.
         * @returns {Object} Returns the stack cache instance.
         */
        function stackSet(key, value) {
          var data = this.__data__;
          if (data instanceof ListCache) {
            var pairs = data.__data__;
            if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
              pairs.push([key, value]);
              this.size = ++data.size;
              return this;
            }
            data = this.__data__ = new MapCache(pairs);
          }
          data.set(key, value);
          this.size = data.size;
          return this;
        }

        // Add methods to `Stack`.
        Stack.prototype.clear = stackClear;
        Stack.prototype['delete'] = stackDelete;
        Stack.prototype.get = stackGet;
        Stack.prototype.has = stackHas;
        Stack.prototype.set = stackSet;

        /*------------------------------------------------------------------------*/

        /**
         * Creates an array of the enumerable property names of the array-like `value`.
         *
         * @private
         * @param {*} value The value to query.
         * @param {boolean} inherited Specify returning inherited property names.
         * @returns {Array} Returns the array of property names.
         */
        function arrayLikeKeys(value, inherited) {
          var isArr = isArray(value),
              isArg = !isArr && isArguments(value),
              isBuff = !isArr && !isArg && isBuffer(value),
              isType = !isArr && !isArg && !isBuff && isTypedArray(value),
              skipIndexes = isArr || isArg || isBuff || isType,
              result = skipIndexes ? baseTimes(value.length, String) : [],
              length = result.length;

          for (var key in value) {
            if ((inherited || hasOwnProperty.call(value, key)) &&
                !(skipIndexes && (
                   // Safari 9 has enumerable `arguments.length` in strict mode.
                   key == 'length' ||
                   // Node.js 0.10 has enumerable non-index properties on buffers.
                   (isBuff && (key == 'offset' || key == 'parent')) ||
                   // PhantomJS 2 has enumerable non-index properties on typed arrays.
                   (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
                   // Skip index properties.
                   isIndex(key, length)
                ))) {
              result.push(key);
            }
          }
          return result;
        }

        /**
         * A specialized version of `_.sample` for arrays.
         *
         * @private
         * @param {Array} array The array to sample.
         * @returns {*} Returns the random element.
         */
        function arraySample(array) {
          var length = array.length;
          return length ? array[baseRandom(0, length - 1)] : undefined;
        }

        /**
         * A specialized version of `_.sampleSize` for arrays.
         *
         * @private
         * @param {Array} array The array to sample.
         * @param {number} n The number of elements to sample.
         * @returns {Array} Returns the random elements.
         */
        function arraySampleSize(array, n) {
          return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
        }

        /**
         * A specialized version of `_.shuffle` for arrays.
         *
         * @private
         * @param {Array} array The array to shuffle.
         * @returns {Array} Returns the new shuffled array.
         */
        function arrayShuffle(array) {
          return shuffleSelf(copyArray(array));
        }

        /**
         * This function is like `assignValue` except that it doesn't assign
         * `undefined` values.
         *
         * @private
         * @param {Object} object The object to modify.
         * @param {string} key The key of the property to assign.
         * @param {*} value The value to assign.
         */
        function assignMergeValue(object, key, value) {
          if ((value !== undefined && !eq(object[key], value)) ||
              (value === undefined && !(key in object))) {
            baseAssignValue(object, key, value);
          }
        }

        /**
         * Assigns `value` to `key` of `object` if the existing value is not equivalent
         * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * for equality comparisons.
         *
         * @private
         * @param {Object} object The object to modify.
         * @param {string} key The key of the property to assign.
         * @param {*} value The value to assign.
         */
        function assignValue(object, key, value) {
          var objValue = object[key];
          if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
              (value === undefined && !(key in object))) {
            baseAssignValue(object, key, value);
          }
        }

        /**
         * Gets the index at which the `key` is found in `array` of key-value pairs.
         *
         * @private
         * @param {Array} array The array to inspect.
         * @param {*} key The key to search for.
         * @returns {number} Returns the index of the matched value, else `-1`.
         */
        function assocIndexOf(array, key) {
          var length = array.length;
          while (length--) {
            if (eq(array[length][0], key)) {
              return length;
            }
          }
          return -1;
        }

        /**
         * Aggregates elements of `collection` on `accumulator` with keys transformed
         * by `iteratee` and values set by `setter`.
         *
         * @private
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} setter The function to set `accumulator` values.
         * @param {Function} iteratee The iteratee to transform keys.
         * @param {Object} accumulator The initial aggregated object.
         * @returns {Function} Returns `accumulator`.
         */
        function baseAggregator(collection, setter, iteratee, accumulator) {
          baseEach(collection, function(value, key, collection) {
            setter(accumulator, value, iteratee(value), collection);
          });
          return accumulator;
        }

        /**
         * The base implementation of `_.assign` without support for multiple sources
         * or `customizer` functions.
         *
         * @private
         * @param {Object} object The destination object.
         * @param {Object} source The source object.
         * @returns {Object} Returns `object`.
         */
        function baseAssign(object, source) {
          return object && copyObject(source, keys(source), object);
        }

        /**
         * The base implementation of `_.assignIn` without support for multiple sources
         * or `customizer` functions.
         *
         * @private
         * @param {Object} object The destination object.
         * @param {Object} source The source object.
         * @returns {Object} Returns `object`.
         */
        function baseAssignIn(object, source) {
          return object && copyObject(source, keysIn(source), object);
        }

        /**
         * The base implementation of `assignValue` and `assignMergeValue` without
         * value checks.
         *
         * @private
         * @param {Object} object The object to modify.
         * @param {string} key The key of the property to assign.
         * @param {*} value The value to assign.
         */
        function baseAssignValue(object, key, value) {
          if (key == '__proto__' && defineProperty) {
            defineProperty(object, key, {
              'configurable': true,
              'enumerable': true,
              'value': value,
              'writable': true
            });
          } else {
            object[key] = value;
          }
        }

        /**
         * The base implementation of `_.at` without support for individual paths.
         *
         * @private
         * @param {Object} object The object to iterate over.
         * @param {string[]} paths The property paths to pick.
         * @returns {Array} Returns the picked elements.
         */
        function baseAt(object, paths) {
          var index = -1,
              length = paths.length,
              result = Array(length),
              skip = object == null;

          while (++index < length) {
            result[index] = skip ? undefined : get(object, paths[index]);
          }
          return result;
        }

        /**
         * The base implementation of `_.clamp` which doesn't coerce arguments.
         *
         * @private
         * @param {number} number The number to clamp.
         * @param {number} [lower] The lower bound.
         * @param {number} upper The upper bound.
         * @returns {number} Returns the clamped number.
         */
        function baseClamp(number, lower, upper) {
          if (number === number) {
            if (upper !== undefined) {
              number = number <= upper ? number : upper;
            }
            if (lower !== undefined) {
              number = number >= lower ? number : lower;
            }
          }
          return number;
        }

        /**
         * The base implementation of `_.clone` and `_.cloneDeep` which tracks
         * traversed objects.
         *
         * @private
         * @param {*} value The value to clone.
         * @param {boolean} bitmask The bitmask flags.
         *  1 - Deep clone
         *  2 - Flatten inherited properties
         *  4 - Clone symbols
         * @param {Function} [customizer] The function to customize cloning.
         * @param {string} [key] The key of `value`.
         * @param {Object} [object] The parent object of `value`.
         * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
         * @returns {*} Returns the cloned value.
         */
        function baseClone(value, bitmask, customizer, key, object, stack) {
          var result,
              isDeep = bitmask & CLONE_DEEP_FLAG,
              isFlat = bitmask & CLONE_FLAT_FLAG,
              isFull = bitmask & CLONE_SYMBOLS_FLAG;

          if (customizer) {
            result = object ? customizer(value, key, object, stack) : customizer(value);
          }
          if (result !== undefined) {
            return result;
          }
          if (!isObject(value)) {
            return value;
          }
          var isArr = isArray(value);
          if (isArr) {
            result = initCloneArray(value);
            if (!isDeep) {
              return copyArray(value, result);
            }
          } else {
            var tag = getTag(value),
                isFunc = tag == funcTag || tag == genTag;

            if (isBuffer(value)) {
              return cloneBuffer(value, isDeep);
            }
            if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
              result = (isFlat || isFunc) ? {} : initCloneObject(value);
              if (!isDeep) {
                return isFlat
                  ? copySymbolsIn(value, baseAssignIn(result, value))
                  : copySymbols(value, baseAssign(result, value));
              }
            } else {
              if (!cloneableTags[tag]) {
                return object ? value : {};
              }
              result = initCloneByTag(value, tag, baseClone, isDeep);
            }
          }
          // Check for circular references and return its corresponding clone.
          stack || (stack = new Stack);
          var stacked = stack.get(value);
          if (stacked) {
            return stacked;
          }
          stack.set(value, result);

          var keysFunc = isFull
            ? (isFlat ? getAllKeysIn : getAllKeys)
            : (isFlat ? keysIn : keys);

          var props = isArr ? undefined : keysFunc(value);
          arrayEach(props || value, function(subValue, key) {
            if (props) {
              key = subValue;
              subValue = value[key];
            }
            // Recursively populate clone (susceptible to call stack limits).
            assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
          });
          return result;
        }

        /**
         * The base implementation of `_.conforms` which doesn't clone `source`.
         *
         * @private
         * @param {Object} source The object of property predicates to conform to.
         * @returns {Function} Returns the new spec function.
         */
        function baseConforms(source) {
          var props = keys(source);
          return function(object) {
            return baseConformsTo(object, source, props);
          };
        }

        /**
         * The base implementation of `_.conformsTo` which accepts `props` to check.
         *
         * @private
         * @param {Object} object The object to inspect.
         * @param {Object} source The object of property predicates to conform to.
         * @returns {boolean} Returns `true` if `object` conforms, else `false`.
         */
        function baseConformsTo(object, source, props) {
          var length = props.length;
          if (object == null) {
            return !length;
          }
          object = Object(object);
          while (length--) {
            var key = props[length],
                predicate = source[key],
                value = object[key];

            if ((value === undefined && !(key in object)) || !predicate(value)) {
              return false;
            }
          }
          return true;
        }

        /**
         * The base implementation of `_.delay` and `_.defer` which accepts `args`
         * to provide to `func`.
         *
         * @private
         * @param {Function} func The function to delay.
         * @param {number} wait The number of milliseconds to delay invocation.
         * @param {Array} args The arguments to provide to `func`.
         * @returns {number|Object} Returns the timer id or timeout object.
         */
        function baseDelay(func, wait, args) {
          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          return setTimeout(function() { func.apply(undefined, args); }, wait);
        }

        /**
         * The base implementation of methods like `_.difference` without support
         * for excluding multiple arrays or iteratee shorthands.
         *
         * @private
         * @param {Array} array The array to inspect.
         * @param {Array} values The values to exclude.
         * @param {Function} [iteratee] The iteratee invoked per element.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new array of filtered values.
         */
        function baseDifference(array, values, iteratee, comparator) {
          var index = -1,
              includes = arrayIncludes,
              isCommon = true,
              length = array.length,
              result = [],
              valuesLength = values.length;

          if (!length) {
            return result;
          }
          if (iteratee) {
            values = arrayMap(values, baseUnary(iteratee));
          }
          if (comparator) {
            includes = arrayIncludesWith;
            isCommon = false;
          }
          else if (values.length >= LARGE_ARRAY_SIZE) {
            includes = cacheHas;
            isCommon = false;
            values = new SetCache(values);
          }
          outer:
          while (++index < length) {
            var value = array[index],
                computed = iteratee == null ? value : iteratee(value);

            value = (comparator || value !== 0) ? value : 0;
            if (isCommon && computed === computed) {
              var valuesIndex = valuesLength;
              while (valuesIndex--) {
                if (values[valuesIndex] === computed) {
                  continue outer;
                }
              }
              result.push(value);
            }
            else if (!includes(values, computed, comparator)) {
              result.push(value);
            }
          }
          return result;
        }

        /**
         * The base implementation of `_.forEach` without support for iteratee shorthands.
         *
         * @private
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} iteratee The function invoked per iteration.
         * @returns {Array|Object} Returns `collection`.
         */
        var baseEach = createBaseEach(baseForOwn);

        /**
         * The base implementation of `_.forEachRight` without support for iteratee shorthands.
         *
         * @private
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} iteratee The function invoked per iteration.
         * @returns {Array|Object} Returns `collection`.
         */
        var baseEachRight = createBaseEach(baseForOwnRight, true);

        /**
         * The base implementation of `_.every` without support for iteratee shorthands.
         *
         * @private
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} predicate The function invoked per iteration.
         * @returns {boolean} Returns `true` if all elements pass the predicate check,
         *  else `false`
         */
        function baseEvery(collection, predicate) {
          var result = true;
          baseEach(collection, function(value, index, collection) {
            result = !!predicate(value, index, collection);
            return result;
          });
          return result;
        }

        /**
         * The base implementation of methods like `_.max` and `_.min` which accepts a
         * `comparator` to determine the extremum value.
         *
         * @private
         * @param {Array} array The array to iterate over.
         * @param {Function} iteratee The iteratee invoked per iteration.
         * @param {Function} comparator The comparator used to compare values.
         * @returns {*} Returns the extremum value.
         */
        function baseExtremum(array, iteratee, comparator) {
          var index = -1,
              length = array.length;

          while (++index < length) {
            var value = array[index],
                current = iteratee(value);

            if (current != null && (computed === undefined
                  ? (current === current && !isSymbol(current))
                  : comparator(current, computed)
                )) {
              var computed = current,
                  result = value;
            }
          }
          return result;
        }

        /**
         * The base implementation of `_.fill` without an iteratee call guard.
         *
         * @private
         * @param {Array} array The array to fill.
         * @param {*} value The value to fill `array` with.
         * @param {number} [start=0] The start position.
         * @param {number} [end=array.length] The end position.
         * @returns {Array} Returns `array`.
         */
        function baseFill(array, value, start, end) {
          var length = array.length;

          start = toInteger(start);
          if (start < 0) {
            start = -start > length ? 0 : (length + start);
          }
          end = (end === undefined || end > length) ? length : toInteger(end);
          if (end < 0) {
            end += length;
          }
          end = start > end ? 0 : toLength(end);
          while (start < end) {
            array[start++] = value;
          }
          return array;
        }

        /**
         * The base implementation of `_.filter` without support for iteratee shorthands.
         *
         * @private
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} predicate The function invoked per iteration.
         * @returns {Array} Returns the new filtered array.
         */
        function baseFilter(collection, predicate) {
          var result = [];
          baseEach(collection, function(value, index, collection) {
            if (predicate(value, index, collection)) {
              result.push(value);
            }
          });
          return result;
        }

        /**
         * The base implementation of `_.flatten` with support for restricting flattening.
         *
         * @private
         * @param {Array} array The array to flatten.
         * @param {number} depth The maximum recursion depth.
         * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
         * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
         * @param {Array} [result=[]] The initial result value.
         * @returns {Array} Returns the new flattened array.
         */
        function baseFlatten(array, depth, predicate, isStrict, result) {
          var index = -1,
              length = array.length;

          predicate || (predicate = isFlattenable);
          result || (result = []);

          while (++index < length) {
            var value = array[index];
            if (depth > 0 && predicate(value)) {
              if (depth > 1) {
                // Recursively flatten arrays (susceptible to call stack limits).
                baseFlatten(value, depth - 1, predicate, isStrict, result);
              } else {
                arrayPush(result, value);
              }
            } else if (!isStrict) {
              result[result.length] = value;
            }
          }
          return result;
        }

        /**
         * The base implementation of `baseForOwn` which iterates over `object`
         * properties returned by `keysFunc` and invokes `iteratee` for each property.
         * Iteratee functions may exit iteration early by explicitly returning `false`.
         *
         * @private
         * @param {Object} object The object to iterate over.
         * @param {Function} iteratee The function invoked per iteration.
         * @param {Function} keysFunc The function to get the keys of `object`.
         * @returns {Object} Returns `object`.
         */
        var baseFor = createBaseFor();

        /**
         * This function is like `baseFor` except that it iterates over properties
         * in the opposite order.
         *
         * @private
         * @param {Object} object The object to iterate over.
         * @param {Function} iteratee The function invoked per iteration.
         * @param {Function} keysFunc The function to get the keys of `object`.
         * @returns {Object} Returns `object`.
         */
        var baseForRight = createBaseFor(true);

        /**
         * The base implementation of `_.forOwn` without support for iteratee shorthands.
         *
         * @private
         * @param {Object} object The object to iterate over.
         * @param {Function} iteratee The function invoked per iteration.
         * @returns {Object} Returns `object`.
         */
        function baseForOwn(object, iteratee) {
          return object && baseFor(object, iteratee, keys);
        }

        /**
         * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
         *
         * @private
         * @param {Object} object The object to iterate over.
         * @param {Function} iteratee The function invoked per iteration.
         * @returns {Object} Returns `object`.
         */
        function baseForOwnRight(object, iteratee) {
          return object && baseForRight(object, iteratee, keys);
        }

        /**
         * The base implementation of `_.functions` which creates an array of
         * `object` function property names filtered from `props`.
         *
         * @private
         * @param {Object} object The object to inspect.
         * @param {Array} props The property names to filter.
         * @returns {Array} Returns the function names.
         */
        function baseFunctions(object, props) {
          return arrayFilter(props, function(key) {
            return isFunction(object[key]);
          });
        }

        /**
         * The base implementation of `_.get` without support for default values.
         *
         * @private
         * @param {Object} object The object to query.
         * @param {Array|string} path The path of the property to get.
         * @returns {*} Returns the resolved value.
         */
        function baseGet(object, path) {
          path = castPath(path, object);

          var index = 0,
              length = path.length;

          while (object != null && index < length) {
            object = object[toKey(path[index++])];
          }
          return (index && index == length) ? object : undefined;
        }

        /**
         * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
         * `keysFunc` and `symbolsFunc` to get the enumerable property names and
         * symbols of `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @param {Function} keysFunc The function to get the keys of `object`.
         * @param {Function} symbolsFunc The function to get the symbols of `object`.
         * @returns {Array} Returns the array of property names and symbols.
         */
        function baseGetAllKeys(object, keysFunc, symbolsFunc) {
          var result = keysFunc(object);
          return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
        }

        /**
         * The base implementation of `getTag` without fallbacks for buggy environments.
         *
         * @private
         * @param {*} value The value to query.
         * @returns {string} Returns the `toStringTag`.
         */
        function baseGetTag(value) {
          if (value == null) {
            return value === undefined ? undefinedTag : nullTag;
          }
          return (symToStringTag && symToStringTag in Object(value))
            ? getRawTag(value)
            : objectToString(value);
        }

        /**
         * The base implementation of `_.gt` which doesn't coerce arguments.
         *
         * @private
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {boolean} Returns `true` if `value` is greater than `other`,
         *  else `false`.
         */
        function baseGt(value, other) {
          return value > other;
        }

        /**
         * The base implementation of `_.has` without support for deep paths.
         *
         * @private
         * @param {Object} [object] The object to query.
         * @param {Array|string} key The key to check.
         * @returns {boolean} Returns `true` if `key` exists, else `false`.
         */
        function baseHas(object, key) {
          return object != null && hasOwnProperty.call(object, key);
        }

        /**
         * The base implementation of `_.hasIn` without support for deep paths.
         *
         * @private
         * @param {Object} [object] The object to query.
         * @param {Array|string} key The key to check.
         * @returns {boolean} Returns `true` if `key` exists, else `false`.
         */
        function baseHasIn(object, key) {
          return object != null && key in Object(object);
        }

        /**
         * The base implementation of `_.inRange` which doesn't coerce arguments.
         *
         * @private
         * @param {number} number The number to check.
         * @param {number} start The start of the range.
         * @param {number} end The end of the range.
         * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
         */
        function baseInRange(number, start, end) {
          return number >= nativeMin(start, end) && number < nativeMax(start, end);
        }

        /**
         * The base implementation of methods like `_.intersection`, without support
         * for iteratee shorthands, that accepts an array of arrays to inspect.
         *
         * @private
         * @param {Array} arrays The arrays to inspect.
         * @param {Function} [iteratee] The iteratee invoked per element.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new array of shared values.
         */
        function baseIntersection(arrays, iteratee, comparator) {
          var includes = comparator ? arrayIncludesWith : arrayIncludes,
              length = arrays[0].length,
              othLength = arrays.length,
              othIndex = othLength,
              caches = Array(othLength),
              maxLength = Infinity,
              result = [];

          while (othIndex--) {
            var array = arrays[othIndex];
            if (othIndex && iteratee) {
              array = arrayMap(array, baseUnary(iteratee));
            }
            maxLength = nativeMin(array.length, maxLength);
            caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
              ? new SetCache(othIndex && array)
              : undefined;
          }
          array = arrays[0];

          var index = -1,
              seen = caches[0];

          outer:
          while (++index < length && result.length < maxLength) {
            var value = array[index],
                computed = iteratee ? iteratee(value) : value;

            value = (comparator || value !== 0) ? value : 0;
            if (!(seen
                  ? cacheHas(seen, computed)
                  : includes(result, computed, comparator)
                )) {
              othIndex = othLength;
              while (--othIndex) {
                var cache = caches[othIndex];
                if (!(cache
                      ? cacheHas(cache, computed)
                      : includes(arrays[othIndex], computed, comparator))
                    ) {
                  continue outer;
                }
              }
              if (seen) {
                seen.push(computed);
              }
              result.push(value);
            }
          }
          return result;
        }

        /**
         * The base implementation of `_.invert` and `_.invertBy` which inverts
         * `object` with values transformed by `iteratee` and set by `setter`.
         *
         * @private
         * @param {Object} object The object to iterate over.
         * @param {Function} setter The function to set `accumulator` values.
         * @param {Function} iteratee The iteratee to transform values.
         * @param {Object} accumulator The initial inverted object.
         * @returns {Function} Returns `accumulator`.
         */
        function baseInverter(object, setter, iteratee, accumulator) {
          baseForOwn(object, function(value, key, object) {
            setter(accumulator, iteratee(value), key, object);
          });
          return accumulator;
        }

        /**
         * The base implementation of `_.invoke` without support for individual
         * method arguments.
         *
         * @private
         * @param {Object} object The object to query.
         * @param {Array|string} path The path of the method to invoke.
         * @param {Array} args The arguments to invoke the method with.
         * @returns {*} Returns the result of the invoked method.
         */
        function baseInvoke(object, path, args) {
          path = castPath(path, object);
          object = parent(object, path);
          var func = object == null ? object : object[toKey(last(path))];
          return func == null ? undefined : apply(func, object, args);
        }

        /**
         * The base implementation of `_.isArguments`.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an `arguments` object,
         */
        function baseIsArguments(value) {
          return isObjectLike(value) && baseGetTag(value) == argsTag;
        }

        /**
         * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
         */
        function baseIsArrayBuffer(value) {
          return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
        }

        /**
         * The base implementation of `_.isDate` without Node.js optimizations.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
         */
        function baseIsDate(value) {
          return isObjectLike(value) && baseGetTag(value) == dateTag;
        }

        /**
         * The base implementation of `_.isEqual` which supports partial comparisons
         * and tracks traversed objects.
         *
         * @private
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @param {boolean} bitmask The bitmask flags.
         *  1 - Unordered comparison
         *  2 - Partial comparison
         * @param {Function} [customizer] The function to customize comparisons.
         * @param {Object} [stack] Tracks traversed `value` and `other` objects.
         * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
         */
        function baseIsEqual(value, other, bitmask, customizer, stack) {
          if (value === other) {
            return true;
          }
          if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
            return value !== value && other !== other;
          }
          return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
        }

        /**
         * A specialized version of `baseIsEqual` for arrays and objects which performs
         * deep comparisons and tracks traversed objects enabling objects with circular
         * references to be compared.
         *
         * @private
         * @param {Object} object The object to compare.
         * @param {Object} other The other object to compare.
         * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
         * @param {Function} customizer The function to customize comparisons.
         * @param {Function} equalFunc The function to determine equivalents of values.
         * @param {Object} [stack] Tracks traversed `object` and `other` objects.
         * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
         */
        function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
          var objIsArr = isArray(object),
              othIsArr = isArray(other),
              objTag = objIsArr ? arrayTag : getTag(object),
              othTag = othIsArr ? arrayTag : getTag(other);

          objTag = objTag == argsTag ? objectTag : objTag;
          othTag = othTag == argsTag ? objectTag : othTag;

          var objIsObj = objTag == objectTag,
              othIsObj = othTag == objectTag,
              isSameTag = objTag == othTag;

          if (isSameTag && isBuffer(object)) {
            if (!isBuffer(other)) {
              return false;
            }
            objIsArr = true;
            objIsObj = false;
          }
          if (isSameTag && !objIsObj) {
            stack || (stack = new Stack);
            return (objIsArr || isTypedArray(object))
              ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
              : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
          }
          if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
            var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
                othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');

            if (objIsWrapped || othIsWrapped) {
              var objUnwrapped = objIsWrapped ? object.value() : object,
                  othUnwrapped = othIsWrapped ? other.value() : other;

              stack || (stack = new Stack);
              return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
            }
          }
          if (!isSameTag) {
            return false;
          }
          stack || (stack = new Stack);
          return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
        }

        /**
         * The base implementation of `_.isMap` without Node.js optimizations.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a map, else `false`.
         */
        function baseIsMap(value) {
          return isObjectLike(value) && getTag(value) == mapTag;
        }

        /**
         * The base implementation of `_.isMatch` without support for iteratee shorthands.
         *
         * @private
         * @param {Object} object The object to inspect.
         * @param {Object} source The object of property values to match.
         * @param {Array} matchData The property names, values, and compare flags to match.
         * @param {Function} [customizer] The function to customize comparisons.
         * @returns {boolean} Returns `true` if `object` is a match, else `false`.
         */
        function baseIsMatch(object, source, matchData, customizer) {
          var index = matchData.length,
              length = index,
              noCustomizer = !customizer;

          if (object == null) {
            return !length;
          }
          object = Object(object);
          while (index--) {
            var data = matchData[index];
            if ((noCustomizer && data[2])
                  ? data[1] !== object[data[0]]
                  : !(data[0] in object)
                ) {
              return false;
            }
          }
          while (++index < length) {
            data = matchData[index];
            var key = data[0],
                objValue = object[key],
                srcValue = data[1];

            if (noCustomizer && data[2]) {
              if (objValue === undefined && !(key in object)) {
                return false;
              }
            } else {
              var stack = new Stack;
              if (customizer) {
                var result = customizer(objValue, srcValue, key, object, source, stack);
              }
              if (!(result === undefined
                    ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
                    : result
                  )) {
                return false;
              }
            }
          }
          return true;
        }

        /**
         * The base implementation of `_.isNative` without bad shim checks.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a native function,
         *  else `false`.
         */
        function baseIsNative(value) {
          if (!isObject(value) || isMasked(value)) {
            return false;
          }
          var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
          return pattern.test(toSource(value));
        }

        /**
         * The base implementation of `_.isRegExp` without Node.js optimizations.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
         */
        function baseIsRegExp(value) {
          return isObjectLike(value) && baseGetTag(value) == regexpTag;
        }

        /**
         * The base implementation of `_.isSet` without Node.js optimizations.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a set, else `false`.
         */
        function baseIsSet(value) {
          return isObjectLike(value) && getTag(value) == setTag;
        }

        /**
         * The base implementation of `_.isTypedArray` without Node.js optimizations.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
         */
        function baseIsTypedArray(value) {
          return isObjectLike(value) &&
            isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
        }

        /**
         * The base implementation of `_.iteratee`.
         *
         * @private
         * @param {*} [value=_.identity] The value to convert to an iteratee.
         * @returns {Function} Returns the iteratee.
         */
        function baseIteratee(value) {
          // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
          // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
          if (typeof value == 'function') {
            return value;
          }
          if (value == null) {
            return identity;
          }
          if (typeof value == 'object') {
            return isArray(value)
              ? baseMatchesProperty(value[0], value[1])
              : baseMatches(value);
          }
          return property(value);
        }

        /**
         * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
         *
         * @private
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property names.
         */
        function baseKeys(object) {
          if (!isPrototype(object)) {
            return nativeKeys(object);
          }
          var result = [];
          for (var key in Object(object)) {
            if (hasOwnProperty.call(object, key) && key != 'constructor') {
              result.push(key);
            }
          }
          return result;
        }

        /**
         * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
         *
         * @private
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property names.
         */
        function baseKeysIn(object) {
          if (!isObject(object)) {
            return nativeKeysIn(object);
          }
          var isProto = isPrototype(object),
              result = [];

          for (var key in object) {
            if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
              result.push(key);
            }
          }
          return result;
        }

        /**
         * The base implementation of `_.lt` which doesn't coerce arguments.
         *
         * @private
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {boolean} Returns `true` if `value` is less than `other`,
         *  else `false`.
         */
        function baseLt(value, other) {
          return value < other;
        }

        /**
         * The base implementation of `_.map` without support for iteratee shorthands.
         *
         * @private
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} iteratee The function invoked per iteration.
         * @returns {Array} Returns the new mapped array.
         */
        function baseMap(collection, iteratee) {
          var index = -1,
              result = isArrayLike(collection) ? Array(collection.length) : [];

          baseEach(collection, function(value, key, collection) {
            result[++index] = iteratee(value, key, collection);
          });
          return result;
        }

        /**
         * The base implementation of `_.matches` which doesn't clone `source`.
         *
         * @private
         * @param {Object} source The object of property values to match.
         * @returns {Function} Returns the new spec function.
         */
        function baseMatches(source) {
          var matchData = getMatchData(source);
          if (matchData.length == 1 && matchData[0][2]) {
            return matchesStrictComparable(matchData[0][0], matchData[0][1]);
          }
          return function(object) {
            return object === source || baseIsMatch(object, source, matchData);
          };
        }

        /**
         * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
         *
         * @private
         * @param {string} path The path of the property to get.
         * @param {*} srcValue The value to match.
         * @returns {Function} Returns the new spec function.
         */
        function baseMatchesProperty(path, srcValue) {
          if (isKey(path) && isStrictComparable(srcValue)) {
            return matchesStrictComparable(toKey(path), srcValue);
          }
          return function(object) {
            var objValue = get(object, path);
            return (objValue === undefined && objValue === srcValue)
              ? hasIn(object, path)
              : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
          };
        }

        /**
         * The base implementation of `_.merge` without support for multiple sources.
         *
         * @private
         * @param {Object} object The destination object.
         * @param {Object} source The source object.
         * @param {number} srcIndex The index of `source`.
         * @param {Function} [customizer] The function to customize merged values.
         * @param {Object} [stack] Tracks traversed source values and their merged
         *  counterparts.
         */
        function baseMerge(object, source, srcIndex, customizer, stack) {
          if (object === source) {
            return;
          }
          baseFor(source, function(srcValue, key) {
            if (isObject(srcValue)) {
              stack || (stack = new Stack);
              baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
            }
            else {
              var newValue = customizer
                ? customizer(object[key], srcValue, (key + ''), object, source, stack)
                : undefined;

              if (newValue === undefined) {
                newValue = srcValue;
              }
              assignMergeValue(object, key, newValue);
            }
          }, keysIn);
        }

        /**
         * A specialized version of `baseMerge` for arrays and objects which performs
         * deep merges and tracks traversed objects enabling objects with circular
         * references to be merged.
         *
         * @private
         * @param {Object} object The destination object.
         * @param {Object} source The source object.
         * @param {string} key The key of the value to merge.
         * @param {number} srcIndex The index of `source`.
         * @param {Function} mergeFunc The function to merge values.
         * @param {Function} [customizer] The function to customize assigned values.
         * @param {Object} [stack] Tracks traversed source values and their merged
         *  counterparts.
         */
        function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
          var objValue = object[key],
              srcValue = source[key],
              stacked = stack.get(srcValue);

          if (stacked) {
            assignMergeValue(object, key, stacked);
            return;
          }
          var newValue = customizer
            ? customizer(objValue, srcValue, (key + ''), object, source, stack)
            : undefined;

          var isCommon = newValue === undefined;

          if (isCommon) {
            var isArr = isArray(srcValue),
                isBuff = !isArr && isBuffer(srcValue),
                isTyped = !isArr && !isBuff && isTypedArray(srcValue);

            newValue = srcValue;
            if (isArr || isBuff || isTyped) {
              if (isArray(objValue)) {
                newValue = objValue;
              }
              else if (isArrayLikeObject(objValue)) {
                newValue = copyArray(objValue);
              }
              else if (isBuff) {
                isCommon = false;
                newValue = cloneBuffer(srcValue, true);
              }
              else if (isTyped) {
                isCommon = false;
                newValue = cloneTypedArray(srcValue, true);
              }
              else {
                newValue = [];
              }
            }
            else if (isPlainObject(srcValue) || isArguments(srcValue)) {
              newValue = objValue;
              if (isArguments(objValue)) {
                newValue = toPlainObject(objValue);
              }
              else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
                newValue = initCloneObject(srcValue);
              }
            }
            else {
              isCommon = false;
            }
          }
          if (isCommon) {
            // Recursively merge objects and arrays (susceptible to call stack limits).
            stack.set(srcValue, newValue);
            mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
            stack['delete'](srcValue);
          }
          assignMergeValue(object, key, newValue);
        }

        /**
         * The base implementation of `_.nth` which doesn't coerce arguments.
         *
         * @private
         * @param {Array} array The array to query.
         * @param {number} n The index of the element to return.
         * @returns {*} Returns the nth element of `array`.
         */
        function baseNth(array, n) {
          var length = array.length;
          if (!length) {
            return;
          }
          n += n < 0 ? length : 0;
          return isIndex(n, length) ? array[n] : undefined;
        }

        /**
         * The base implementation of `_.orderBy` without param guards.
         *
         * @private
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
         * @param {string[]} orders The sort orders of `iteratees`.
         * @returns {Array} Returns the new sorted array.
         */
        function baseOrderBy(collection, iteratees, orders) {
          var index = -1;
          iteratees = arrayMap(iteratees.length ? iteratees : [identity], baseUnary(getIteratee()));

          var result = baseMap(collection, function(value, key, collection) {
            var criteria = arrayMap(iteratees, function(iteratee) {
              return iteratee(value);
            });
            return { 'criteria': criteria, 'index': ++index, 'value': value };
          });

          return baseSortBy(result, function(object, other) {
            return compareMultiple(object, other, orders);
          });
        }

        /**
         * The base implementation of `_.pick` without support for individual
         * property identifiers.
         *
         * @private
         * @param {Object} object The source object.
         * @param {string[]} paths The property paths to pick.
         * @returns {Object} Returns the new object.
         */
        function basePick(object, paths) {
          return basePickBy(object, paths, function(value, path) {
            return hasIn(object, path);
          });
        }

        /**
         * The base implementation of  `_.pickBy` without support for iteratee shorthands.
         *
         * @private
         * @param {Object} object The source object.
         * @param {string[]} paths The property paths to pick.
         * @param {Function} predicate The function invoked per property.
         * @returns {Object} Returns the new object.
         */
        function basePickBy(object, paths, predicate) {
          var index = -1,
              length = paths.length,
              result = {};

          while (++index < length) {
            var path = paths[index],
                value = baseGet(object, path);

            if (predicate(value, path)) {
              baseSet(result, castPath(path, object), value);
            }
          }
          return result;
        }

        /**
         * A specialized version of `baseProperty` which supports deep paths.
         *
         * @private
         * @param {Array|string} path The path of the property to get.
         * @returns {Function} Returns the new accessor function.
         */
        function basePropertyDeep(path) {
          return function(object) {
            return baseGet(object, path);
          };
        }

        /**
         * The base implementation of `_.pullAllBy` without support for iteratee
         * shorthands.
         *
         * @private
         * @param {Array} array The array to modify.
         * @param {Array} values The values to remove.
         * @param {Function} [iteratee] The iteratee invoked per element.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns `array`.
         */
        function basePullAll(array, values, iteratee, comparator) {
          var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
              index = -1,
              length = values.length,
              seen = array;

          if (array === values) {
            values = copyArray(values);
          }
          if (iteratee) {
            seen = arrayMap(array, baseUnary(iteratee));
          }
          while (++index < length) {
            var fromIndex = 0,
                value = values[index],
                computed = iteratee ? iteratee(value) : value;

            while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
              if (seen !== array) {
                splice.call(seen, fromIndex, 1);
              }
              splice.call(array, fromIndex, 1);
            }
          }
          return array;
        }

        /**
         * The base implementation of `_.pullAt` without support for individual
         * indexes or capturing the removed elements.
         *
         * @private
         * @param {Array} array The array to modify.
         * @param {number[]} indexes The indexes of elements to remove.
         * @returns {Array} Returns `array`.
         */
        function basePullAt(array, indexes) {
          var length = array ? indexes.length : 0,
              lastIndex = length - 1;

          while (length--) {
            var index = indexes[length];
            if (length == lastIndex || index !== previous) {
              var previous = index;
              if (isIndex(index)) {
                splice.call(array, index, 1);
              } else {
                baseUnset(array, index);
              }
            }
          }
          return array;
        }

        /**
         * The base implementation of `_.random` without support for returning
         * floating-point numbers.
         *
         * @private
         * @param {number} lower The lower bound.
         * @param {number} upper The upper bound.
         * @returns {number} Returns the random number.
         */
        function baseRandom(lower, upper) {
          return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
        }

        /**
         * The base implementation of `_.range` and `_.rangeRight` which doesn't
         * coerce arguments.
         *
         * @private
         * @param {number} start The start of the range.
         * @param {number} end The end of the range.
         * @param {number} step The value to increment or decrement by.
         * @param {boolean} [fromRight] Specify iterating from right to left.
         * @returns {Array} Returns the range of numbers.
         */
        function baseRange(start, end, step, fromRight) {
          var index = -1,
              length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
              result = Array(length);

          while (length--) {
            result[fromRight ? length : ++index] = start;
            start += step;
          }
          return result;
        }

        /**
         * The base implementation of `_.repeat` which doesn't coerce arguments.
         *
         * @private
         * @param {string} string The string to repeat.
         * @param {number} n The number of times to repeat the string.
         * @returns {string} Returns the repeated string.
         */
        function baseRepeat(string, n) {
          var result = '';
          if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
            return result;
          }
          // Leverage the exponentiation by squaring algorithm for a faster repeat.
          // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
          do {
            if (n % 2) {
              result += string;
            }
            n = nativeFloor(n / 2);
            if (n) {
              string += string;
            }
          } while (n);

          return result;
        }

        /**
         * The base implementation of `_.rest` which doesn't validate or coerce arguments.
         *
         * @private
         * @param {Function} func The function to apply a rest parameter to.
         * @param {number} [start=func.length-1] The start position of the rest parameter.
         * @returns {Function} Returns the new function.
         */
        function baseRest(func, start) {
          return setToString(overRest(func, start, identity), func + '');
        }

        /**
         * The base implementation of `_.sample`.
         *
         * @private
         * @param {Array|Object} collection The collection to sample.
         * @returns {*} Returns the random element.
         */
        function baseSample(collection) {
          return arraySample(values(collection));
        }

        /**
         * The base implementation of `_.sampleSize` without param guards.
         *
         * @private
         * @param {Array|Object} collection The collection to sample.
         * @param {number} n The number of elements to sample.
         * @returns {Array} Returns the random elements.
         */
        function baseSampleSize(collection, n) {
          var array = values(collection);
          return shuffleSelf(array, baseClamp(n, 0, array.length));
        }

        /**
         * The base implementation of `_.set`.
         *
         * @private
         * @param {Object} object The object to modify.
         * @param {Array|string} path The path of the property to set.
         * @param {*} value The value to set.
         * @param {Function} [customizer] The function to customize path creation.
         * @returns {Object} Returns `object`.
         */
        function baseSet(object, path, value, customizer) {
          if (!isObject(object)) {
            return object;
          }
          path = castPath(path, object);

          var index = -1,
              length = path.length,
              lastIndex = length - 1,
              nested = object;

          while (nested != null && ++index < length) {
            var key = toKey(path[index]),
                newValue = value;

            if (index != lastIndex) {
              var objValue = nested[key];
              newValue = customizer ? customizer(objValue, key, nested) : undefined;
              if (newValue === undefined) {
                newValue = isObject(objValue)
                  ? objValue
                  : (isIndex(path[index + 1]) ? [] : {});
              }
            }
            assignValue(nested, key, newValue);
            nested = nested[key];
          }
          return object;
        }

        /**
         * The base implementation of `setData` without support for hot loop shorting.
         *
         * @private
         * @param {Function} func The function to associate metadata with.
         * @param {*} data The metadata.
         * @returns {Function} Returns `func`.
         */
        var baseSetData = !metaMap ? identity : function(func, data) {
          metaMap.set(func, data);
          return func;
        };

        /**
         * The base implementation of `setToString` without support for hot loop shorting.
         *
         * @private
         * @param {Function} func The function to modify.
         * @param {Function} string The `toString` result.
         * @returns {Function} Returns `func`.
         */
        var baseSetToString = !defineProperty ? identity : function(func, string) {
          return defineProperty(func, 'toString', {
            'configurable': true,
            'enumerable': false,
            'value': constant(string),
            'writable': true
          });
        };

        /**
         * The base implementation of `_.shuffle`.
         *
         * @private
         * @param {Array|Object} collection The collection to shuffle.
         * @returns {Array} Returns the new shuffled array.
         */
        function baseShuffle(collection) {
          return shuffleSelf(values(collection));
        }

        /**
         * The base implementation of `_.slice` without an iteratee call guard.
         *
         * @private
         * @param {Array} array The array to slice.
         * @param {number} [start=0] The start position.
         * @param {number} [end=array.length] The end position.
         * @returns {Array} Returns the slice of `array`.
         */
        function baseSlice(array, start, end) {
          var index = -1,
              length = array.length;

          if (start < 0) {
            start = -start > length ? 0 : (length + start);
          }
          end = end > length ? length : end;
          if (end < 0) {
            end += length;
          }
          length = start > end ? 0 : ((end - start) >>> 0);
          start >>>= 0;

          var result = Array(length);
          while (++index < length) {
            result[index] = array[index + start];
          }
          return result;
        }

        /**
         * The base implementation of `_.some` without support for iteratee shorthands.
         *
         * @private
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} predicate The function invoked per iteration.
         * @returns {boolean} Returns `true` if any element passes the predicate check,
         *  else `false`.
         */
        function baseSome(collection, predicate) {
          var result;

          baseEach(collection, function(value, index, collection) {
            result = predicate(value, index, collection);
            return !result;
          });
          return !!result;
        }

        /**
         * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
         * performs a binary search of `array` to determine the index at which `value`
         * should be inserted into `array` in order to maintain its sort order.
         *
         * @private
         * @param {Array} array The sorted array to inspect.
         * @param {*} value The value to evaluate.
         * @param {boolean} [retHighest] Specify returning the highest qualified index.
         * @returns {number} Returns the index at which `value` should be inserted
         *  into `array`.
         */
        function baseSortedIndex(array, value, retHighest) {
          var low = 0,
              high = array == null ? low : array.length;

          if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
            while (low < high) {
              var mid = (low + high) >>> 1,
                  computed = array[mid];

              if (computed !== null && !isSymbol(computed) &&
                  (retHighest ? (computed <= value) : (computed < value))) {
                low = mid + 1;
              } else {
                high = mid;
              }
            }
            return high;
          }
          return baseSortedIndexBy(array, value, identity, retHighest);
        }

        /**
         * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
         * which invokes `iteratee` for `value` and each element of `array` to compute
         * their sort ranking. The iteratee is invoked with one argument; (value).
         *
         * @private
         * @param {Array} array The sorted array to inspect.
         * @param {*} value The value to evaluate.
         * @param {Function} iteratee The iteratee invoked per element.
         * @param {boolean} [retHighest] Specify returning the highest qualified index.
         * @returns {number} Returns the index at which `value` should be inserted
         *  into `array`.
         */
        function baseSortedIndexBy(array, value, iteratee, retHighest) {
          value = iteratee(value);

          var low = 0,
              high = array == null ? 0 : array.length,
              valIsNaN = value !== value,
              valIsNull = value === null,
              valIsSymbol = isSymbol(value),
              valIsUndefined = value === undefined;

          while (low < high) {
            var mid = nativeFloor((low + high) / 2),
                computed = iteratee(array[mid]),
                othIsDefined = computed !== undefined,
                othIsNull = computed === null,
                othIsReflexive = computed === computed,
                othIsSymbol = isSymbol(computed);

            if (valIsNaN) {
              var setLow = retHighest || othIsReflexive;
            } else if (valIsUndefined) {
              setLow = othIsReflexive && (retHighest || othIsDefined);
            } else if (valIsNull) {
              setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
            } else if (valIsSymbol) {
              setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
            } else if (othIsNull || othIsSymbol) {
              setLow = false;
            } else {
              setLow = retHighest ? (computed <= value) : (computed < value);
            }
            if (setLow) {
              low = mid + 1;
            } else {
              high = mid;
            }
          }
          return nativeMin(high, MAX_ARRAY_INDEX);
        }

        /**
         * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
         * support for iteratee shorthands.
         *
         * @private
         * @param {Array} array The array to inspect.
         * @param {Function} [iteratee] The iteratee invoked per element.
         * @returns {Array} Returns the new duplicate free array.
         */
        function baseSortedUniq(array, iteratee) {
          var index = -1,
              length = array.length,
              resIndex = 0,
              result = [];

          while (++index < length) {
            var value = array[index],
                computed = iteratee ? iteratee(value) : value;

            if (!index || !eq(computed, seen)) {
              var seen = computed;
              result[resIndex++] = value === 0 ? 0 : value;
            }
          }
          return result;
        }

        /**
         * The base implementation of `_.toNumber` which doesn't ensure correct
         * conversions of binary, hexadecimal, or octal string values.
         *
         * @private
         * @param {*} value The value to process.
         * @returns {number} Returns the number.
         */
        function baseToNumber(value) {
          if (typeof value == 'number') {
            return value;
          }
          if (isSymbol(value)) {
            return NAN;
          }
          return +value;
        }

        /**
         * The base implementation of `_.toString` which doesn't convert nullish
         * values to empty strings.
         *
         * @private
         * @param {*} value The value to process.
         * @returns {string} Returns the string.
         */
        function baseToString(value) {
          // Exit early for strings to avoid a performance hit in some environments.
          if (typeof value == 'string') {
            return value;
          }
          if (isArray(value)) {
            // Recursively convert values (susceptible to call stack limits).
            return arrayMap(value, baseToString) + '';
          }
          if (isSymbol(value)) {
            return symbolToString ? symbolToString.call(value) : '';
          }
          var result = (value + '');
          return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
        }

        /**
         * The base implementation of `_.uniqBy` without support for iteratee shorthands.
         *
         * @private
         * @param {Array} array The array to inspect.
         * @param {Function} [iteratee] The iteratee invoked per element.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new duplicate free array.
         */
        function baseUniq(array, iteratee, comparator) {
          var index = -1,
              includes = arrayIncludes,
              length = array.length,
              isCommon = true,
              result = [],
              seen = result;

          if (comparator) {
            isCommon = false;
            includes = arrayIncludesWith;
          }
          else if (length >= LARGE_ARRAY_SIZE) {
            var set = iteratee ? null : createSet(array);
            if (set) {
              return setToArray(set);
            }
            isCommon = false;
            includes = cacheHas;
            seen = new SetCache;
          }
          else {
            seen = iteratee ? [] : result;
          }
          outer:
          while (++index < length) {
            var value = array[index],
                computed = iteratee ? iteratee(value) : value;

            value = (comparator || value !== 0) ? value : 0;
            if (isCommon && computed === computed) {
              var seenIndex = seen.length;
              while (seenIndex--) {
                if (seen[seenIndex] === computed) {
                  continue outer;
                }
              }
              if (iteratee) {
                seen.push(computed);
              }
              result.push(value);
            }
            else if (!includes(seen, computed, comparator)) {
              if (seen !== result) {
                seen.push(computed);
              }
              result.push(value);
            }
          }
          return result;
        }

        /**
         * The base implementation of `_.unset`.
         *
         * @private
         * @param {Object} object The object to modify.
         * @param {Array|string} path The property path to unset.
         * @returns {boolean} Returns `true` if the property is deleted, else `false`.
         */
        function baseUnset(object, path) {
          path = castPath(path, object);
          object = parent(object, path);
          return object == null || delete object[toKey(last(path))];
        }

        /**
         * The base implementation of `_.update`.
         *
         * @private
         * @param {Object} object The object to modify.
         * @param {Array|string} path The path of the property to update.
         * @param {Function} updater The function to produce the updated value.
         * @param {Function} [customizer] The function to customize path creation.
         * @returns {Object} Returns `object`.
         */
        function baseUpdate(object, path, updater, customizer) {
          return baseSet(object, path, updater(baseGet(object, path)), customizer);
        }

        /**
         * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
         * without support for iteratee shorthands.
         *
         * @private
         * @param {Array} array The array to query.
         * @param {Function} predicate The function invoked per iteration.
         * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
         * @param {boolean} [fromRight] Specify iterating from right to left.
         * @returns {Array} Returns the slice of `array`.
         */
        function baseWhile(array, predicate, isDrop, fromRight) {
          var length = array.length,
              index = fromRight ? length : -1;

          while ((fromRight ? index-- : ++index < length) &&
            predicate(array[index], index, array)) {}

          return isDrop
            ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
            : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
        }

        /**
         * The base implementation of `wrapperValue` which returns the result of
         * performing a sequence of actions on the unwrapped `value`, where each
         * successive action is supplied the return value of the previous.
         *
         * @private
         * @param {*} value The unwrapped value.
         * @param {Array} actions Actions to perform to resolve the unwrapped value.
         * @returns {*} Returns the resolved value.
         */
        function baseWrapperValue(value, actions) {
          var result = value;
          if (result instanceof LazyWrapper) {
            result = result.value();
          }
          return arrayReduce(actions, function(result, action) {
            return action.func.apply(action.thisArg, arrayPush([result], action.args));
          }, result);
        }

        /**
         * The base implementation of methods like `_.xor`, without support for
         * iteratee shorthands, that accepts an array of arrays to inspect.
         *
         * @private
         * @param {Array} arrays The arrays to inspect.
         * @param {Function} [iteratee] The iteratee invoked per element.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new array of values.
         */
        function baseXor(arrays, iteratee, comparator) {
          var length = arrays.length;
          if (length < 2) {
            return length ? baseUniq(arrays[0]) : [];
          }
          var index = -1,
              result = Array(length);

          while (++index < length) {
            var array = arrays[index],
                othIndex = -1;

            while (++othIndex < length) {
              if (othIndex != index) {
                result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
              }
            }
          }
          return baseUniq(baseFlatten(result, 1), iteratee, comparator);
        }

        /**
         * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
         *
         * @private
         * @param {Array} props The property identifiers.
         * @param {Array} values The property values.
         * @param {Function} assignFunc The function to assign values.
         * @returns {Object} Returns the new object.
         */
        function baseZipObject(props, values, assignFunc) {
          var index = -1,
              length = props.length,
              valsLength = values.length,
              result = {};

          while (++index < length) {
            var value = index < valsLength ? values[index] : undefined;
            assignFunc(result, props[index], value);
          }
          return result;
        }

        /**
         * Casts `value` to an empty array if it's not an array like object.
         *
         * @private
         * @param {*} value The value to inspect.
         * @returns {Array|Object} Returns the cast array-like object.
         */
        function castArrayLikeObject(value) {
          return isArrayLikeObject(value) ? value : [];
        }

        /**
         * Casts `value` to `identity` if it's not a function.
         *
         * @private
         * @param {*} value The value to inspect.
         * @returns {Function} Returns cast function.
         */
        function castFunction(value) {
          return typeof value == 'function' ? value : identity;
        }

        /**
         * Casts `value` to a path array if it's not one.
         *
         * @private
         * @param {*} value The value to inspect.
         * @param {Object} [object] The object to query keys on.
         * @returns {Array} Returns the cast property path array.
         */
        function castPath(value, object) {
          if (isArray(value)) {
            return value;
          }
          return isKey(value, object) ? [value] : stringToPath(toString(value));
        }

        /**
         * A `baseRest` alias which can be replaced with `identity` by module
         * replacement plugins.
         *
         * @private
         * @type {Function}
         * @param {Function} func The function to apply a rest parameter to.
         * @returns {Function} Returns the new function.
         */
        var castRest = baseRest;

        /**
         * Casts `array` to a slice if it's needed.
         *
         * @private
         * @param {Array} array The array to inspect.
         * @param {number} start The start position.
         * @param {number} [end=array.length] The end position.
         * @returns {Array} Returns the cast slice.
         */
        function castSlice(array, start, end) {
          var length = array.length;
          end = end === undefined ? length : end;
          return (!start && end >= length) ? array : baseSlice(array, start, end);
        }

        /**
         * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
         *
         * @private
         * @param {number|Object} id The timer id or timeout object of the timer to clear.
         */
        var clearTimeout = ctxClearTimeout || function(id) {
          return root.clearTimeout(id);
        };

        /**
         * Creates a clone of  `buffer`.
         *
         * @private
         * @param {Buffer} buffer The buffer to clone.
         * @param {boolean} [isDeep] Specify a deep clone.
         * @returns {Buffer} Returns the cloned buffer.
         */
        function cloneBuffer(buffer, isDeep) {
          if (isDeep) {
            return buffer.slice();
          }
          var length = buffer.length,
              result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);

          buffer.copy(result);
          return result;
        }

        /**
         * Creates a clone of `arrayBuffer`.
         *
         * @private
         * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
         * @returns {ArrayBuffer} Returns the cloned array buffer.
         */
        function cloneArrayBuffer(arrayBuffer) {
          var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
          new Uint8Array(result).set(new Uint8Array(arrayBuffer));
          return result;
        }

        /**
         * Creates a clone of `dataView`.
         *
         * @private
         * @param {Object} dataView The data view to clone.
         * @param {boolean} [isDeep] Specify a deep clone.
         * @returns {Object} Returns the cloned data view.
         */
        function cloneDataView(dataView, isDeep) {
          var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
          return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
        }

        /**
         * Creates a clone of `map`.
         *
         * @private
         * @param {Object} map The map to clone.
         * @param {Function} cloneFunc The function to clone values.
         * @param {boolean} [isDeep] Specify a deep clone.
         * @returns {Object} Returns the cloned map.
         */
        function cloneMap(map, isDeep, cloneFunc) {
          var array = isDeep ? cloneFunc(mapToArray(map), CLONE_DEEP_FLAG) : mapToArray(map);
          return arrayReduce(array, addMapEntry, new map.constructor);
        }

        /**
         * Creates a clone of `regexp`.
         *
         * @private
         * @param {Object} regexp The regexp to clone.
         * @returns {Object} Returns the cloned regexp.
         */
        function cloneRegExp(regexp) {
          var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
          result.lastIndex = regexp.lastIndex;
          return result;
        }

        /**
         * Creates a clone of `set`.
         *
         * @private
         * @param {Object} set The set to clone.
         * @param {Function} cloneFunc The function to clone values.
         * @param {boolean} [isDeep] Specify a deep clone.
         * @returns {Object} Returns the cloned set.
         */
        function cloneSet(set, isDeep, cloneFunc) {
          var array = isDeep ? cloneFunc(setToArray(set), CLONE_DEEP_FLAG) : setToArray(set);
          return arrayReduce(array, addSetEntry, new set.constructor);
        }

        /**
         * Creates a clone of the `symbol` object.
         *
         * @private
         * @param {Object} symbol The symbol object to clone.
         * @returns {Object} Returns the cloned symbol object.
         */
        function cloneSymbol(symbol) {
          return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
        }

        /**
         * Creates a clone of `typedArray`.
         *
         * @private
         * @param {Object} typedArray The typed array to clone.
         * @param {boolean} [isDeep] Specify a deep clone.
         * @returns {Object} Returns the cloned typed array.
         */
        function cloneTypedArray(typedArray, isDeep) {
          var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
          return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
        }

        /**
         * Compares values to sort them in ascending order.
         *
         * @private
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {number} Returns the sort order indicator for `value`.
         */
        function compareAscending(value, other) {
          if (value !== other) {
            var valIsDefined = value !== undefined,
                valIsNull = value === null,
                valIsReflexive = value === value,
                valIsSymbol = isSymbol(value);

            var othIsDefined = other !== undefined,
                othIsNull = other === null,
                othIsReflexive = other === other,
                othIsSymbol = isSymbol(other);

            if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
                (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
                (valIsNull && othIsDefined && othIsReflexive) ||
                (!valIsDefined && othIsReflexive) ||
                !valIsReflexive) {
              return 1;
            }
            if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
                (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
                (othIsNull && valIsDefined && valIsReflexive) ||
                (!othIsDefined && valIsReflexive) ||
                !othIsReflexive) {
              return -1;
            }
          }
          return 0;
        }

        /**
         * Used by `_.orderBy` to compare multiple properties of a value to another
         * and stable sort them.
         *
         * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
         * specify an order of "desc" for descending or "asc" for ascending sort order
         * of corresponding values.
         *
         * @private
         * @param {Object} object The object to compare.
         * @param {Object} other The other object to compare.
         * @param {boolean[]|string[]} orders The order to sort by for each property.
         * @returns {number} Returns the sort order indicator for `object`.
         */
        function compareMultiple(object, other, orders) {
          var index = -1,
              objCriteria = object.criteria,
              othCriteria = other.criteria,
              length = objCriteria.length,
              ordersLength = orders.length;

          while (++index < length) {
            var result = compareAscending(objCriteria[index], othCriteria[index]);
            if (result) {
              if (index >= ordersLength) {
                return result;
              }
              var order = orders[index];
              return result * (order == 'desc' ? -1 : 1);
            }
          }
          // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
          // that causes it, under certain circumstances, to provide the same value for
          // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
          // for more details.
          //
          // This also ensures a stable sort in V8 and other engines.
          // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
          return object.index - other.index;
        }

        /**
         * Creates an array that is the composition of partially applied arguments,
         * placeholders, and provided arguments into a single array of arguments.
         *
         * @private
         * @param {Array} args The provided arguments.
         * @param {Array} partials The arguments to prepend to those provided.
         * @param {Array} holders The `partials` placeholder indexes.
         * @params {boolean} [isCurried] Specify composing for a curried function.
         * @returns {Array} Returns the new array of composed arguments.
         */
        function composeArgs(args, partials, holders, isCurried) {
          var argsIndex = -1,
              argsLength = args.length,
              holdersLength = holders.length,
              leftIndex = -1,
              leftLength = partials.length,
              rangeLength = nativeMax(argsLength - holdersLength, 0),
              result = Array(leftLength + rangeLength),
              isUncurried = !isCurried;

          while (++leftIndex < leftLength) {
            result[leftIndex] = partials[leftIndex];
          }
          while (++argsIndex < holdersLength) {
            if (isUncurried || argsIndex < argsLength) {
              result[holders[argsIndex]] = args[argsIndex];
            }
          }
          while (rangeLength--) {
            result[leftIndex++] = args[argsIndex++];
          }
          return result;
        }

        /**
         * This function is like `composeArgs` except that the arguments composition
         * is tailored for `_.partialRight`.
         *
         * @private
         * @param {Array} args The provided arguments.
         * @param {Array} partials The arguments to append to those provided.
         * @param {Array} holders The `partials` placeholder indexes.
         * @params {boolean} [isCurried] Specify composing for a curried function.
         * @returns {Array} Returns the new array of composed arguments.
         */
        function composeArgsRight(args, partials, holders, isCurried) {
          var argsIndex = -1,
              argsLength = args.length,
              holdersIndex = -1,
              holdersLength = holders.length,
              rightIndex = -1,
              rightLength = partials.length,
              rangeLength = nativeMax(argsLength - holdersLength, 0),
              result = Array(rangeLength + rightLength),
              isUncurried = !isCurried;

          while (++argsIndex < rangeLength) {
            result[argsIndex] = args[argsIndex];
          }
          var offset = argsIndex;
          while (++rightIndex < rightLength) {
            result[offset + rightIndex] = partials[rightIndex];
          }
          while (++holdersIndex < holdersLength) {
            if (isUncurried || argsIndex < argsLength) {
              result[offset + holders[holdersIndex]] = args[argsIndex++];
            }
          }
          return result;
        }

        /**
         * Copies the values of `source` to `array`.
         *
         * @private
         * @param {Array} source The array to copy values from.
         * @param {Array} [array=[]] The array to copy values to.
         * @returns {Array} Returns `array`.
         */
        function copyArray(source, array) {
          var index = -1,
              length = source.length;

          array || (array = Array(length));
          while (++index < length) {
            array[index] = source[index];
          }
          return array;
        }

        /**
         * Copies properties of `source` to `object`.
         *
         * @private
         * @param {Object} source The object to copy properties from.
         * @param {Array} props The property identifiers to copy.
         * @param {Object} [object={}] The object to copy properties to.
         * @param {Function} [customizer] The function to customize copied values.
         * @returns {Object} Returns `object`.
         */
        function copyObject(source, props, object, customizer) {
          var isNew = !object;
          object || (object = {});

          var index = -1,
              length = props.length;

          while (++index < length) {
            var key = props[index];

            var newValue = customizer
              ? customizer(object[key], source[key], key, object, source)
              : undefined;

            if (newValue === undefined) {
              newValue = source[key];
            }
            if (isNew) {
              baseAssignValue(object, key, newValue);
            } else {
              assignValue(object, key, newValue);
            }
          }
          return object;
        }

        /**
         * Copies own symbols of `source` to `object`.
         *
         * @private
         * @param {Object} source The object to copy symbols from.
         * @param {Object} [object={}] The object to copy symbols to.
         * @returns {Object} Returns `object`.
         */
        function copySymbols(source, object) {
          return copyObject(source, getSymbols(source), object);
        }

        /**
         * Copies own and inherited symbols of `source` to `object`.
         *
         * @private
         * @param {Object} source The object to copy symbols from.
         * @param {Object} [object={}] The object to copy symbols to.
         * @returns {Object} Returns `object`.
         */
        function copySymbolsIn(source, object) {
          return copyObject(source, getSymbolsIn(source), object);
        }

        /**
         * Creates a function like `_.groupBy`.
         *
         * @private
         * @param {Function} setter The function to set accumulator values.
         * @param {Function} [initializer] The accumulator object initializer.
         * @returns {Function} Returns the new aggregator function.
         */
        function createAggregator(setter, initializer) {
          return function(collection, iteratee) {
            var func = isArray(collection) ? arrayAggregator : baseAggregator,
                accumulator = initializer ? initializer() : {};

            return func(collection, setter, getIteratee(iteratee, 2), accumulator);
          };
        }

        /**
         * Creates a function like `_.assign`.
         *
         * @private
         * @param {Function} assigner The function to assign values.
         * @returns {Function} Returns the new assigner function.
         */
        function createAssigner(assigner) {
          return baseRest(function(object, sources) {
            var index = -1,
                length = sources.length,
                customizer = length > 1 ? sources[length - 1] : undefined,
                guard = length > 2 ? sources[2] : undefined;

            customizer = (assigner.length > 3 && typeof customizer == 'function')
              ? (length--, customizer)
              : undefined;

            if (guard && isIterateeCall(sources[0], sources[1], guard)) {
              customizer = length < 3 ? undefined : customizer;
              length = 1;
            }
            object = Object(object);
            while (++index < length) {
              var source = sources[index];
              if (source) {
                assigner(object, source, index, customizer);
              }
            }
            return object;
          });
        }

        /**
         * Creates a `baseEach` or `baseEachRight` function.
         *
         * @private
         * @param {Function} eachFunc The function to iterate over a collection.
         * @param {boolean} [fromRight] Specify iterating from right to left.
         * @returns {Function} Returns the new base function.
         */
        function createBaseEach(eachFunc, fromRight) {
          return function(collection, iteratee) {
            if (collection == null) {
              return collection;
            }
            if (!isArrayLike(collection)) {
              return eachFunc(collection, iteratee);
            }
            var length = collection.length,
                index = fromRight ? length : -1,
                iterable = Object(collection);

            while ((fromRight ? index-- : ++index < length)) {
              if (iteratee(iterable[index], index, iterable) === false) {
                break;
              }
            }
            return collection;
          };
        }

        /**
         * Creates a base function for methods like `_.forIn` and `_.forOwn`.
         *
         * @private
         * @param {boolean} [fromRight] Specify iterating from right to left.
         * @returns {Function} Returns the new base function.
         */
        function createBaseFor(fromRight) {
          return function(object, iteratee, keysFunc) {
            var index = -1,
                iterable = Object(object),
                props = keysFunc(object),
                length = props.length;

            while (length--) {
              var key = props[fromRight ? length : ++index];
              if (iteratee(iterable[key], key, iterable) === false) {
                break;
              }
            }
            return object;
          };
        }

        /**
         * Creates a function that wraps `func` to invoke it with the optional `this`
         * binding of `thisArg`.
         *
         * @private
         * @param {Function} func The function to wrap.
         * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
         * @param {*} [thisArg] The `this` binding of `func`.
         * @returns {Function} Returns the new wrapped function.
         */
        function createBind(func, bitmask, thisArg) {
          var isBind = bitmask & WRAP_BIND_FLAG,
              Ctor = createCtor(func);

          function wrapper() {
            var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
            return fn.apply(isBind ? thisArg : this, arguments);
          }
          return wrapper;
        }

        /**
         * Creates a function like `_.lowerFirst`.
         *
         * @private
         * @param {string} methodName The name of the `String` case method to use.
         * @returns {Function} Returns the new case function.
         */
        function createCaseFirst(methodName) {
          return function(string) {
            string = toString(string);

            var strSymbols = hasUnicode(string)
              ? stringToArray(string)
              : undefined;

            var chr = strSymbols
              ? strSymbols[0]
              : string.charAt(0);

            var trailing = strSymbols
              ? castSlice(strSymbols, 1).join('')
              : string.slice(1);

            return chr[methodName]() + trailing;
          };
        }

        /**
         * Creates a function like `_.camelCase`.
         *
         * @private
         * @param {Function} callback The function to combine each word.
         * @returns {Function} Returns the new compounder function.
         */
        function createCompounder(callback) {
          return function(string) {
            return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
          };
        }

        /**
         * Creates a function that produces an instance of `Ctor` regardless of
         * whether it was invoked as part of a `new` expression or by `call` or `apply`.
         *
         * @private
         * @param {Function} Ctor The constructor to wrap.
         * @returns {Function} Returns the new wrapped function.
         */
        function createCtor(Ctor) {
          return function() {
            // Use a `switch` statement to work with class constructors. See
            // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
            // for more details.
            var args = arguments;
            switch (args.length) {
              case 0: return new Ctor;
              case 1: return new Ctor(args[0]);
              case 2: return new Ctor(args[0], args[1]);
              case 3: return new Ctor(args[0], args[1], args[2]);
              case 4: return new Ctor(args[0], args[1], args[2], args[3]);
              case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
              case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
              case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
            }
            var thisBinding = baseCreate(Ctor.prototype),
                result = Ctor.apply(thisBinding, args);

            // Mimic the constructor's `return` behavior.
            // See https://es5.github.io/#x13.2.2 for more details.
            return isObject(result) ? result : thisBinding;
          };
        }

        /**
         * Creates a function that wraps `func` to enable currying.
         *
         * @private
         * @param {Function} func The function to wrap.
         * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
         * @param {number} arity The arity of `func`.
         * @returns {Function} Returns the new wrapped function.
         */
        function createCurry(func, bitmask, arity) {
          var Ctor = createCtor(func);

          function wrapper() {
            var length = arguments.length,
                args = Array(length),
                index = length,
                placeholder = getHolder(wrapper);

            while (index--) {
              args[index] = arguments[index];
            }
            var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
              ? []
              : replaceHolders(args, placeholder);

            length -= holders.length;
            if (length < arity) {
              return createRecurry(
                func, bitmask, createHybrid, wrapper.placeholder, undefined,
                args, holders, undefined, undefined, arity - length);
            }
            var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
            return apply(fn, this, args);
          }
          return wrapper;
        }

        /**
         * Creates a `_.find` or `_.findLast` function.
         *
         * @private
         * @param {Function} findIndexFunc The function to find the collection index.
         * @returns {Function} Returns the new find function.
         */
        function createFind(findIndexFunc) {
          return function(collection, predicate, fromIndex) {
            var iterable = Object(collection);
            if (!isArrayLike(collection)) {
              var iteratee = getIteratee(predicate, 3);
              collection = keys(collection);
              predicate = function(key) { return iteratee(iterable[key], key, iterable); };
            }
            var index = findIndexFunc(collection, predicate, fromIndex);
            return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
          };
        }

        /**
         * Creates a `_.flow` or `_.flowRight` function.
         *
         * @private
         * @param {boolean} [fromRight] Specify iterating from right to left.
         * @returns {Function} Returns the new flow function.
         */
        function createFlow(fromRight) {
          return flatRest(function(funcs) {
            var length = funcs.length,
                index = length,
                prereq = LodashWrapper.prototype.thru;

            if (fromRight) {
              funcs.reverse();
            }
            while (index--) {
              var func = funcs[index];
              if (typeof func != 'function') {
                throw new TypeError(FUNC_ERROR_TEXT);
              }
              if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
                var wrapper = new LodashWrapper([], true);
              }
            }
            index = wrapper ? index : length;
            while (++index < length) {
              func = funcs[index];

              var funcName = getFuncName(func),
                  data = funcName == 'wrapper' ? getData(func) : undefined;

              if (data && isLaziable(data[0]) &&
                    data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
                    !data[4].length && data[9] == 1
                  ) {
                wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
              } else {
                wrapper = (func.length == 1 && isLaziable(func))
                  ? wrapper[funcName]()
                  : wrapper.thru(func);
              }
            }
            return function() {
              var args = arguments,
                  value = args[0];

              if (wrapper && args.length == 1 && isArray(value)) {
                return wrapper.plant(value).value();
              }
              var index = 0,
                  result = length ? funcs[index].apply(this, args) : value;

              while (++index < length) {
                result = funcs[index].call(this, result);
              }
              return result;
            };
          });
        }

        /**
         * Creates a function that wraps `func` to invoke it with optional `this`
         * binding of `thisArg`, partial application, and currying.
         *
         * @private
         * @param {Function|string} func The function or method name to wrap.
         * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
         * @param {*} [thisArg] The `this` binding of `func`.
         * @param {Array} [partials] The arguments to prepend to those provided to
         *  the new function.
         * @param {Array} [holders] The `partials` placeholder indexes.
         * @param {Array} [partialsRight] The arguments to append to those provided
         *  to the new function.
         * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
         * @param {Array} [argPos] The argument positions of the new function.
         * @param {number} [ary] The arity cap of `func`.
         * @param {number} [arity] The arity of `func`.
         * @returns {Function} Returns the new wrapped function.
         */
        function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
          var isAry = bitmask & WRAP_ARY_FLAG,
              isBind = bitmask & WRAP_BIND_FLAG,
              isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
              isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
              isFlip = bitmask & WRAP_FLIP_FLAG,
              Ctor = isBindKey ? undefined : createCtor(func);

          function wrapper() {
            var length = arguments.length,
                args = Array(length),
                index = length;

            while (index--) {
              args[index] = arguments[index];
            }
            if (isCurried) {
              var placeholder = getHolder(wrapper),
                  holdersCount = countHolders(args, placeholder);
            }
            if (partials) {
              args = composeArgs(args, partials, holders, isCurried);
            }
            if (partialsRight) {
              args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
            }
            length -= holdersCount;
            if (isCurried && length < arity) {
              var newHolders = replaceHolders(args, placeholder);
              return createRecurry(
                func, bitmask, createHybrid, wrapper.placeholder, thisArg,
                args, newHolders, argPos, ary, arity - length
              );
            }
            var thisBinding = isBind ? thisArg : this,
                fn = isBindKey ? thisBinding[func] : func;

            length = args.length;
            if (argPos) {
              args = reorder(args, argPos);
            } else if (isFlip && length > 1) {
              args.reverse();
            }
            if (isAry && ary < length) {
              args.length = ary;
            }
            if (this && this !== root && this instanceof wrapper) {
              fn = Ctor || createCtor(fn);
            }
            return fn.apply(thisBinding, args);
          }
          return wrapper;
        }

        /**
         * Creates a function like `_.invertBy`.
         *
         * @private
         * @param {Function} setter The function to set accumulator values.
         * @param {Function} toIteratee The function to resolve iteratees.
         * @returns {Function} Returns the new inverter function.
         */
        function createInverter(setter, toIteratee) {
          return function(object, iteratee) {
            return baseInverter(object, setter, toIteratee(iteratee), {});
          };
        }

        /**
         * Creates a function that performs a mathematical operation on two values.
         *
         * @private
         * @param {Function} operator The function to perform the operation.
         * @param {number} [defaultValue] The value used for `undefined` arguments.
         * @returns {Function} Returns the new mathematical operation function.
         */
        function createMathOperation(operator, defaultValue) {
          return function(value, other) {
            var result;
            if (value === undefined && other === undefined) {
              return defaultValue;
            }
            if (value !== undefined) {
              result = value;
            }
            if (other !== undefined) {
              if (result === undefined) {
                return other;
              }
              if (typeof value == 'string' || typeof other == 'string') {
                value = baseToString(value);
                other = baseToString(other);
              } else {
                value = baseToNumber(value);
                other = baseToNumber(other);
              }
              result = operator(value, other);
            }
            return result;
          };
        }

        /**
         * Creates a function like `_.over`.
         *
         * @private
         * @param {Function} arrayFunc The function to iterate over iteratees.
         * @returns {Function} Returns the new over function.
         */
        function createOver(arrayFunc) {
          return flatRest(function(iteratees) {
            iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
            return baseRest(function(args) {
              var thisArg = this;
              return arrayFunc(iteratees, function(iteratee) {
                return apply(iteratee, thisArg, args);
              });
            });
          });
        }

        /**
         * Creates the padding for `string` based on `length`. The `chars` string
         * is truncated if the number of characters exceeds `length`.
         *
         * @private
         * @param {number} length The padding length.
         * @param {string} [chars=' '] The string used as padding.
         * @returns {string} Returns the padding for `string`.
         */
        function createPadding(length, chars) {
          chars = chars === undefined ? ' ' : baseToString(chars);

          var charsLength = chars.length;
          if (charsLength < 2) {
            return charsLength ? baseRepeat(chars, length) : chars;
          }
          var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
          return hasUnicode(chars)
            ? castSlice(stringToArray(result), 0, length).join('')
            : result.slice(0, length);
        }

        /**
         * Creates a function that wraps `func` to invoke it with the `this` binding
         * of `thisArg` and `partials` prepended to the arguments it receives.
         *
         * @private
         * @param {Function} func The function to wrap.
         * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
         * @param {*} thisArg The `this` binding of `func`.
         * @param {Array} partials The arguments to prepend to those provided to
         *  the new function.
         * @returns {Function} Returns the new wrapped function.
         */
        function createPartial(func, bitmask, thisArg, partials) {
          var isBind = bitmask & WRAP_BIND_FLAG,
              Ctor = createCtor(func);

          function wrapper() {
            var argsIndex = -1,
                argsLength = arguments.length,
                leftIndex = -1,
                leftLength = partials.length,
                args = Array(leftLength + argsLength),
                fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;

            while (++leftIndex < leftLength) {
              args[leftIndex] = partials[leftIndex];
            }
            while (argsLength--) {
              args[leftIndex++] = arguments[++argsIndex];
            }
            return apply(fn, isBind ? thisArg : this, args);
          }
          return wrapper;
        }

        /**
         * Creates a `_.range` or `_.rangeRight` function.
         *
         * @private
         * @param {boolean} [fromRight] Specify iterating from right to left.
         * @returns {Function} Returns the new range function.
         */
        function createRange(fromRight) {
          return function(start, end, step) {
            if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
              end = step = undefined;
            }
            // Ensure the sign of `-0` is preserved.
            start = toFinite(start);
            if (end === undefined) {
              end = start;
              start = 0;
            } else {
              end = toFinite(end);
            }
            step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
            return baseRange(start, end, step, fromRight);
          };
        }

        /**
         * Creates a function that performs a relational operation on two values.
         *
         * @private
         * @param {Function} operator The function to perform the operation.
         * @returns {Function} Returns the new relational operation function.
         */
        function createRelationalOperation(operator) {
          return function(value, other) {
            if (!(typeof value == 'string' && typeof other == 'string')) {
              value = toNumber(value);
              other = toNumber(other);
            }
            return operator(value, other);
          };
        }

        /**
         * Creates a function that wraps `func` to continue currying.
         *
         * @private
         * @param {Function} func The function to wrap.
         * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
         * @param {Function} wrapFunc The function to create the `func` wrapper.
         * @param {*} placeholder The placeholder value.
         * @param {*} [thisArg] The `this` binding of `func`.
         * @param {Array} [partials] The arguments to prepend to those provided to
         *  the new function.
         * @param {Array} [holders] The `partials` placeholder indexes.
         * @param {Array} [argPos] The argument positions of the new function.
         * @param {number} [ary] The arity cap of `func`.
         * @param {number} [arity] The arity of `func`.
         * @returns {Function} Returns the new wrapped function.
         */
        function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
          var isCurry = bitmask & WRAP_CURRY_FLAG,
              newHolders = isCurry ? holders : undefined,
              newHoldersRight = isCurry ? undefined : holders,
              newPartials = isCurry ? partials : undefined,
              newPartialsRight = isCurry ? undefined : partials;

          bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
          bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);

          if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
            bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
          }
          var newData = [
            func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
            newHoldersRight, argPos, ary, arity
          ];

          var result = wrapFunc.apply(undefined, newData);
          if (isLaziable(func)) {
            setData(result, newData);
          }
          result.placeholder = placeholder;
          return setWrapToString(result, func, bitmask);
        }

        /**
         * Creates a function like `_.round`.
         *
         * @private
         * @param {string} methodName The name of the `Math` method to use when rounding.
         * @returns {Function} Returns the new round function.
         */
        function createRound(methodName) {
          var func = Math[methodName];
          return function(number, precision) {
            number = toNumber(number);
            precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
            if (precision) {
              // Shift with exponential notation to avoid floating-point issues.
              // See [MDN](https://mdn.io/round#Examples) for more details.
              var pair = (toString(number) + 'e').split('e'),
                  value = func(pair[0] + 'e' + (+pair[1] + precision));

              pair = (toString(value) + 'e').split('e');
              return +(pair[0] + 'e' + (+pair[1] - precision));
            }
            return func(number);
          };
        }

        /**
         * Creates a set object of `values`.
         *
         * @private
         * @param {Array} values The values to add to the set.
         * @returns {Object} Returns the new set.
         */
        var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
          return new Set(values);
        };

        /**
         * Creates a `_.toPairs` or `_.toPairsIn` function.
         *
         * @private
         * @param {Function} keysFunc The function to get the keys of a given object.
         * @returns {Function} Returns the new pairs function.
         */
        function createToPairs(keysFunc) {
          return function(object) {
            var tag = getTag(object);
            if (tag == mapTag) {
              return mapToArray(object);
            }
            if (tag == setTag) {
              return setToPairs(object);
            }
            return baseToPairs(object, keysFunc(object));
          };
        }

        /**
         * Creates a function that either curries or invokes `func` with optional
         * `this` binding and partially applied arguments.
         *
         * @private
         * @param {Function|string} func The function or method name to wrap.
         * @param {number} bitmask The bitmask flags.
         *    1 - `_.bind`
         *    2 - `_.bindKey`
         *    4 - `_.curry` or `_.curryRight` of a bound function
         *    8 - `_.curry`
         *   16 - `_.curryRight`
         *   32 - `_.partial`
         *   64 - `_.partialRight`
         *  128 - `_.rearg`
         *  256 - `_.ary`
         *  512 - `_.flip`
         * @param {*} [thisArg] The `this` binding of `func`.
         * @param {Array} [partials] The arguments to be partially applied.
         * @param {Array} [holders] The `partials` placeholder indexes.
         * @param {Array} [argPos] The argument positions of the new function.
         * @param {number} [ary] The arity cap of `func`.
         * @param {number} [arity] The arity of `func`.
         * @returns {Function} Returns the new wrapped function.
         */
        function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
          var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
          if (!isBindKey && typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          var length = partials ? partials.length : 0;
          if (!length) {
            bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
            partials = holders = undefined;
          }
          ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
          arity = arity === undefined ? arity : toInteger(arity);
          length -= holders ? holders.length : 0;

          if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
            var partialsRight = partials,
                holdersRight = holders;

            partials = holders = undefined;
          }
          var data = isBindKey ? undefined : getData(func);

          var newData = [
            func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
            argPos, ary, arity
          ];

          if (data) {
            mergeData(newData, data);
          }
          func = newData[0];
          bitmask = newData[1];
          thisArg = newData[2];
          partials = newData[3];
          holders = newData[4];
          arity = newData[9] = newData[9] === undefined
            ? (isBindKey ? 0 : func.length)
            : nativeMax(newData[9] - length, 0);

          if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
            bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
          }
          if (!bitmask || bitmask == WRAP_BIND_FLAG) {
            var result = createBind(func, bitmask, thisArg);
          } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
            result = createCurry(func, bitmask, arity);
          } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
            result = createPartial(func, bitmask, thisArg, partials);
          } else {
            result = createHybrid.apply(undefined, newData);
          }
          var setter = data ? baseSetData : setData;
          return setWrapToString(setter(result, newData), func, bitmask);
        }

        /**
         * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
         * of source objects to the destination object for all destination properties
         * that resolve to `undefined`.
         *
         * @private
         * @param {*} objValue The destination value.
         * @param {*} srcValue The source value.
         * @param {string} key The key of the property to assign.
         * @param {Object} object The parent object of `objValue`.
         * @returns {*} Returns the value to assign.
         */
        function customDefaultsAssignIn(objValue, srcValue, key, object) {
          if (objValue === undefined ||
              (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
            return srcValue;
          }
          return objValue;
        }

        /**
         * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
         * objects into destination objects that are passed thru.
         *
         * @private
         * @param {*} objValue The destination value.
         * @param {*} srcValue The source value.
         * @param {string} key The key of the property to merge.
         * @param {Object} object The parent object of `objValue`.
         * @param {Object} source The parent object of `srcValue`.
         * @param {Object} [stack] Tracks traversed source values and their merged
         *  counterparts.
         * @returns {*} Returns the value to assign.
         */
        function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
          if (isObject(objValue) && isObject(srcValue)) {
            // Recursively merge objects and arrays (susceptible to call stack limits).
            stack.set(srcValue, objValue);
            baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
            stack['delete'](srcValue);
          }
          return objValue;
        }

        /**
         * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
         * objects.
         *
         * @private
         * @param {*} value The value to inspect.
         * @param {string} key The key of the property to inspect.
         * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
         */
        function customOmitClone(value, key) {
          return (key !== undefined && isPlainObject(value)) ? undefined : value;
        }

        /**
         * A specialized version of `baseIsEqualDeep` for arrays with support for
         * partial deep comparisons.
         *
         * @private
         * @param {Array} array The array to compare.
         * @param {Array} other The other array to compare.
         * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
         * @param {Function} customizer The function to customize comparisons.
         * @param {Function} equalFunc The function to determine equivalents of values.
         * @param {Object} stack Tracks traversed `array` and `other` objects.
         * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
         */
        function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
          var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
              arrLength = array.length,
              othLength = other.length;

          if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
            return false;
          }
          // Assume cyclic values are equal.
          var stacked = stack.get(array);
          if (stacked && stack.get(other)) {
            return stacked == other;
          }
          var index = -1,
              result = true,
              seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;

          stack.set(array, other);
          stack.set(other, array);

          // Ignore non-index properties.
          while (++index < arrLength) {
            var arrValue = array[index],
                othValue = other[index];

            if (customizer) {
              var compared = isPartial
                ? customizer(othValue, arrValue, index, other, array, stack)
                : customizer(arrValue, othValue, index, array, other, stack);
            }
            if (compared !== undefined) {
              if (compared) {
                continue;
              }
              result = false;
              break;
            }
            // Recursively compare arrays (susceptible to call stack limits).
            if (seen) {
              if (!arraySome(other, function(othValue, othIndex) {
                    if (!cacheHas(seen, othIndex) &&
                        (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
                      return seen.push(othIndex);
                    }
                  })) {
                result = false;
                break;
              }
            } else if (!(
                  arrValue === othValue ||
                    equalFunc(arrValue, othValue, bitmask, customizer, stack)
                )) {
              result = false;
              break;
            }
          }
          stack['delete'](array);
          stack['delete'](other);
          return result;
        }

        /**
         * A specialized version of `baseIsEqualDeep` for comparing objects of
         * the same `toStringTag`.
         *
         * **Note:** This function only supports comparing values with tags of
         * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
         *
         * @private
         * @param {Object} object The object to compare.
         * @param {Object} other The other object to compare.
         * @param {string} tag The `toStringTag` of the objects to compare.
         * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
         * @param {Function} customizer The function to customize comparisons.
         * @param {Function} equalFunc The function to determine equivalents of values.
         * @param {Object} stack Tracks traversed `object` and `other` objects.
         * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
         */
        function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
          switch (tag) {
            case dataViewTag:
              if ((object.byteLength != other.byteLength) ||
                  (object.byteOffset != other.byteOffset)) {
                return false;
              }
              object = object.buffer;
              other = other.buffer;

            case arrayBufferTag:
              if ((object.byteLength != other.byteLength) ||
                  !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
                return false;
              }
              return true;

            case boolTag:
            case dateTag:
            case numberTag:
              // Coerce booleans to `1` or `0` and dates to milliseconds.
              // Invalid dates are coerced to `NaN`.
              return eq(+object, +other);

            case errorTag:
              return object.name == other.name && object.message == other.message;

            case regexpTag:
            case stringTag:
              // Coerce regexes to strings and treat strings, primitives and objects,
              // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
              // for more details.
              return object == (other + '');

            case mapTag:
              var convert = mapToArray;

            case setTag:
              var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
              convert || (convert = setToArray);

              if (object.size != other.size && !isPartial) {
                return false;
              }
              // Assume cyclic values are equal.
              var stacked = stack.get(object);
              if (stacked) {
                return stacked == other;
              }
              bitmask |= COMPARE_UNORDERED_FLAG;

              // Recursively compare objects (susceptible to call stack limits).
              stack.set(object, other);
              var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
              stack['delete'](object);
              return result;

            case symbolTag:
              if (symbolValueOf) {
                return symbolValueOf.call(object) == symbolValueOf.call(other);
              }
          }
          return false;
        }

        /**
         * A specialized version of `baseIsEqualDeep` for objects with support for
         * partial deep comparisons.
         *
         * @private
         * @param {Object} object The object to compare.
         * @param {Object} other The other object to compare.
         * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
         * @param {Function} customizer The function to customize comparisons.
         * @param {Function} equalFunc The function to determine equivalents of values.
         * @param {Object} stack Tracks traversed `object` and `other` objects.
         * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
         */
        function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
          var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
              objProps = getAllKeys(object),
              objLength = objProps.length,
              othProps = getAllKeys(other),
              othLength = othProps.length;

          if (objLength != othLength && !isPartial) {
            return false;
          }
          var index = objLength;
          while (index--) {
            var key = objProps[index];
            if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
              return false;
            }
          }
          // Assume cyclic values are equal.
          var stacked = stack.get(object);
          if (stacked && stack.get(other)) {
            return stacked == other;
          }
          var result = true;
          stack.set(object, other);
          stack.set(other, object);

          var skipCtor = isPartial;
          while (++index < objLength) {
            key = objProps[index];
            var objValue = object[key],
                othValue = other[key];

            if (customizer) {
              var compared = isPartial
                ? customizer(othValue, objValue, key, other, object, stack)
                : customizer(objValue, othValue, key, object, other, stack);
            }
            // Recursively compare objects (susceptible to call stack limits).
            if (!(compared === undefined
                  ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
                  : compared
                )) {
              result = false;
              break;
            }
            skipCtor || (skipCtor = key == 'constructor');
          }
          if (result && !skipCtor) {
            var objCtor = object.constructor,
                othCtor = other.constructor;

            // Non `Object` object instances with different constructors are not equal.
            if (objCtor != othCtor &&
                ('constructor' in object && 'constructor' in other) &&
                !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
                  typeof othCtor == 'function' && othCtor instanceof othCtor)) {
              result = false;
            }
          }
          stack['delete'](object);
          stack['delete'](other);
          return result;
        }

        /**
         * A specialized version of `baseRest` which flattens the rest array.
         *
         * @private
         * @param {Function} func The function to apply a rest parameter to.
         * @returns {Function} Returns the new function.
         */
        function flatRest(func) {
          return setToString(overRest(func, undefined, flatten), func + '');
        }

        /**
         * Creates an array of own enumerable property names and symbols of `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property names and symbols.
         */
        function getAllKeys(object) {
          return baseGetAllKeys(object, keys, getSymbols);
        }

        /**
         * Creates an array of own and inherited enumerable property names and
         * symbols of `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property names and symbols.
         */
        function getAllKeysIn(object) {
          return baseGetAllKeys(object, keysIn, getSymbolsIn);
        }

        /**
         * Gets metadata for `func`.
         *
         * @private
         * @param {Function} func The function to query.
         * @returns {*} Returns the metadata for `func`.
         */
        var getData = !metaMap ? noop : function(func) {
          return metaMap.get(func);
        };

        /**
         * Gets the name of `func`.
         *
         * @private
         * @param {Function} func The function to query.
         * @returns {string} Returns the function name.
         */
        function getFuncName(func) {
          var result = (func.name + ''),
              array = realNames[result],
              length = hasOwnProperty.call(realNames, result) ? array.length : 0;

          while (length--) {
            var data = array[length],
                otherFunc = data.func;
            if (otherFunc == null || otherFunc == func) {
              return data.name;
            }
          }
          return result;
        }

        /**
         * Gets the argument placeholder value for `func`.
         *
         * @private
         * @param {Function} func The function to inspect.
         * @returns {*} Returns the placeholder value.
         */
        function getHolder(func) {
          var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
          return object.placeholder;
        }

        /**
         * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
         * this function returns the custom method, otherwise it returns `baseIteratee`.
         * If arguments are provided, the chosen function is invoked with them and
         * its result is returned.
         *
         * @private
         * @param {*} [value] The value to convert to an iteratee.
         * @param {number} [arity] The arity of the created iteratee.
         * @returns {Function} Returns the chosen function or its result.
         */
        function getIteratee() {
          var result = lodash.iteratee || iteratee;
          result = result === iteratee ? baseIteratee : result;
          return arguments.length ? result(arguments[0], arguments[1]) : result;
        }

        /**
         * Gets the data for `map`.
         *
         * @private
         * @param {Object} map The map to query.
         * @param {string} key The reference key.
         * @returns {*} Returns the map data.
         */
        function getMapData(map, key) {
          var data = map.__data__;
          return isKeyable(key)
            ? data[typeof key == 'string' ? 'string' : 'hash']
            : data.map;
        }

        /**
         * Gets the property names, values, and compare flags of `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @returns {Array} Returns the match data of `object`.
         */
        function getMatchData(object) {
          var result = keys(object),
              length = result.length;

          while (length--) {
            var key = result[length],
                value = object[key];

            result[length] = [key, value, isStrictComparable(value)];
          }
          return result;
        }

        /**
         * Gets the native function at `key` of `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @param {string} key The key of the method to get.
         * @returns {*} Returns the function if it's native, else `undefined`.
         */
        function getNative(object, key) {
          var value = getValue(object, key);
          return baseIsNative(value) ? value : undefined;
        }

        /**
         * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
         *
         * @private
         * @param {*} value The value to query.
         * @returns {string} Returns the raw `toStringTag`.
         */
        function getRawTag(value) {
          var isOwn = hasOwnProperty.call(value, symToStringTag),
              tag = value[symToStringTag];

          try {
            value[symToStringTag] = undefined;
            var unmasked = true;
          } catch (e) {}

          var result = nativeObjectToString.call(value);
          if (unmasked) {
            if (isOwn) {
              value[symToStringTag] = tag;
            } else {
              delete value[symToStringTag];
            }
          }
          return result;
        }

        /**
         * Creates an array of the own enumerable symbols of `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of symbols.
         */
        var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
          if (object == null) {
            return [];
          }
          object = Object(object);
          return arrayFilter(nativeGetSymbols(object), function(symbol) {
            return propertyIsEnumerable.call(object, symbol);
          });
        };

        /**
         * Creates an array of the own and inherited enumerable symbols of `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of symbols.
         */
        var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
          var result = [];
          while (object) {
            arrayPush(result, getSymbols(object));
            object = getPrototype(object);
          }
          return result;
        };

        /**
         * Gets the `toStringTag` of `value`.
         *
         * @private
         * @param {*} value The value to query.
         * @returns {string} Returns the `toStringTag`.
         */
        var getTag = baseGetTag;

        // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
        if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
            (Map && getTag(new Map) != mapTag) ||
            (Promise && getTag(Promise.resolve()) != promiseTag) ||
            (Set && getTag(new Set) != setTag) ||
            (WeakMap && getTag(new WeakMap) != weakMapTag)) {
          getTag = function(value) {
            var result = baseGetTag(value),
                Ctor = result == objectTag ? value.constructor : undefined,
                ctorString = Ctor ? toSource(Ctor) : '';

            if (ctorString) {
              switch (ctorString) {
                case dataViewCtorString: return dataViewTag;
                case mapCtorString: return mapTag;
                case promiseCtorString: return promiseTag;
                case setCtorString: return setTag;
                case weakMapCtorString: return weakMapTag;
              }
            }
            return result;
          };
        }

        /**
         * Gets the view, applying any `transforms` to the `start` and `end` positions.
         *
         * @private
         * @param {number} start The start of the view.
         * @param {number} end The end of the view.
         * @param {Array} transforms The transformations to apply to the view.
         * @returns {Object} Returns an object containing the `start` and `end`
         *  positions of the view.
         */
        function getView(start, end, transforms) {
          var index = -1,
              length = transforms.length;

          while (++index < length) {
            var data = transforms[index],
                size = data.size;

            switch (data.type) {
              case 'drop':      start += size; break;
              case 'dropRight': end -= size; break;
              case 'take':      end = nativeMin(end, start + size); break;
              case 'takeRight': start = nativeMax(start, end - size); break;
            }
          }
          return { 'start': start, 'end': end };
        }

        /**
         * Extracts wrapper details from the `source` body comment.
         *
         * @private
         * @param {string} source The source to inspect.
         * @returns {Array} Returns the wrapper details.
         */
        function getWrapDetails(source) {
          var match = source.match(reWrapDetails);
          return match ? match[1].split(reSplitDetails) : [];
        }

        /**
         * Checks if `path` exists on `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @param {Array|string} path The path to check.
         * @param {Function} hasFunc The function to check properties.
         * @returns {boolean} Returns `true` if `path` exists, else `false`.
         */
        function hasPath(object, path, hasFunc) {
          path = castPath(path, object);

          var index = -1,
              length = path.length,
              result = false;

          while (++index < length) {
            var key = toKey(path[index]);
            if (!(result = object != null && hasFunc(object, key))) {
              break;
            }
            object = object[key];
          }
          if (result || ++index != length) {
            return result;
          }
          length = object == null ? 0 : object.length;
          return !!length && isLength(length) && isIndex(key, length) &&
            (isArray(object) || isArguments(object));
        }

        /**
         * Initializes an array clone.
         *
         * @private
         * @param {Array} array The array to clone.
         * @returns {Array} Returns the initialized clone.
         */
        function initCloneArray(array) {
          var length = array.length,
              result = array.constructor(length);

          // Add properties assigned by `RegExp#exec`.
          if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
            result.index = array.index;
            result.input = array.input;
          }
          return result;
        }

        /**
         * Initializes an object clone.
         *
         * @private
         * @param {Object} object The object to clone.
         * @returns {Object} Returns the initialized clone.
         */
        function initCloneObject(object) {
          return (typeof object.constructor == 'function' && !isPrototype(object))
            ? baseCreate(getPrototype(object))
            : {};
        }

        /**
         * Initializes an object clone based on its `toStringTag`.
         *
         * **Note:** This function only supports cloning values with tags of
         * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
         *
         * @private
         * @param {Object} object The object to clone.
         * @param {string} tag The `toStringTag` of the object to clone.
         * @param {Function} cloneFunc The function to clone values.
         * @param {boolean} [isDeep] Specify a deep clone.
         * @returns {Object} Returns the initialized clone.
         */
        function initCloneByTag(object, tag, cloneFunc, isDeep) {
          var Ctor = object.constructor;
          switch (tag) {
            case arrayBufferTag:
              return cloneArrayBuffer(object);

            case boolTag:
            case dateTag:
              return new Ctor(+object);

            case dataViewTag:
              return cloneDataView(object, isDeep);

            case float32Tag: case float64Tag:
            case int8Tag: case int16Tag: case int32Tag:
            case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
              return cloneTypedArray(object, isDeep);

            case mapTag:
              return cloneMap(object, isDeep, cloneFunc);

            case numberTag:
            case stringTag:
              return new Ctor(object);

            case regexpTag:
              return cloneRegExp(object);

            case setTag:
              return cloneSet(object, isDeep, cloneFunc);

            case symbolTag:
              return cloneSymbol(object);
          }
        }

        /**
         * Inserts wrapper `details` in a comment at the top of the `source` body.
         *
         * @private
         * @param {string} source The source to modify.
         * @returns {Array} details The details to insert.
         * @returns {string} Returns the modified source.
         */
        function insertWrapDetails(source, details) {
          var length = details.length;
          if (!length) {
            return source;
          }
          var lastIndex = length - 1;
          details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
          details = details.join(length > 2 ? ', ' : ' ');
          return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
        }

        /**
         * Checks if `value` is a flattenable `arguments` object or array.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
         */
        function isFlattenable(value) {
          return isArray(value) || isArguments(value) ||
            !!(spreadableSymbol && value && value[spreadableSymbol]);
        }

        /**
         * Checks if `value` is a valid array-like index.
         *
         * @private
         * @param {*} value The value to check.
         * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
         * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
         */
        function isIndex(value, length) {
          length = length == null ? MAX_SAFE_INTEGER : length;
          return !!length &&
            (typeof value == 'number' || reIsUint.test(value)) &&
            (value > -1 && value % 1 == 0 && value < length);
        }

        /**
         * Checks if the given arguments are from an iteratee call.
         *
         * @private
         * @param {*} value The potential iteratee value argument.
         * @param {*} index The potential iteratee index or key argument.
         * @param {*} object The potential iteratee object argument.
         * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
         *  else `false`.
         */
        function isIterateeCall(value, index, object) {
          if (!isObject(object)) {
            return false;
          }
          var type = typeof index;
          if (type == 'number'
                ? (isArrayLike(object) && isIndex(index, object.length))
                : (type == 'string' && index in object)
              ) {
            return eq(object[index], value);
          }
          return false;
        }

        /**
         * Checks if `value` is a property name and not a property path.
         *
         * @private
         * @param {*} value The value to check.
         * @param {Object} [object] The object to query keys on.
         * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
         */
        function isKey(value, object) {
          if (isArray(value)) {
            return false;
          }
          var type = typeof value;
          if (type == 'number' || type == 'symbol' || type == 'boolean' ||
              value == null || isSymbol(value)) {
            return true;
          }
          return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
            (object != null && value in Object(object));
        }

        /**
         * Checks if `value` is suitable for use as unique object key.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
         */
        function isKeyable(value) {
          var type = typeof value;
          return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
            ? (value !== '__proto__')
            : (value === null);
        }

        /**
         * Checks if `func` has a lazy counterpart.
         *
         * @private
         * @param {Function} func The function to check.
         * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
         *  else `false`.
         */
        function isLaziable(func) {
          var funcName = getFuncName(func),
              other = lodash[funcName];

          if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
            return false;
          }
          if (func === other) {
            return true;
          }
          var data = getData(other);
          return !!data && func === data[0];
        }

        /**
         * Checks if `func` has its source masked.
         *
         * @private
         * @param {Function} func The function to check.
         * @returns {boolean} Returns `true` if `func` is masked, else `false`.
         */
        function isMasked(func) {
          return !!maskSrcKey && (maskSrcKey in func);
        }

        /**
         * Checks if `func` is capable of being masked.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
         */
        var isMaskable = coreJsData ? isFunction : stubFalse;

        /**
         * Checks if `value` is likely a prototype object.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
         */
        function isPrototype(value) {
          var Ctor = value && value.constructor,
              proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;

          return value === proto;
        }

        /**
         * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
         *
         * @private
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` if suitable for strict
         *  equality comparisons, else `false`.
         */
        function isStrictComparable(value) {
          return value === value && !isObject(value);
        }

        /**
         * A specialized version of `matchesProperty` for source values suitable
         * for strict equality comparisons, i.e. `===`.
         *
         * @private
         * @param {string} key The key of the property to get.
         * @param {*} srcValue The value to match.
         * @returns {Function} Returns the new spec function.
         */
        function matchesStrictComparable(key, srcValue) {
          return function(object) {
            if (object == null) {
              return false;
            }
            return object[key] === srcValue &&
              (srcValue !== undefined || (key in Object(object)));
          };
        }

        /**
         * A specialized version of `_.memoize` which clears the memoized function's
         * cache when it exceeds `MAX_MEMOIZE_SIZE`.
         *
         * @private
         * @param {Function} func The function to have its output memoized.
         * @returns {Function} Returns the new memoized function.
         */
        function memoizeCapped(func) {
          var result = memoize(func, function(key) {
            if (cache.size === MAX_MEMOIZE_SIZE) {
              cache.clear();
            }
            return key;
          });

          var cache = result.cache;
          return result;
        }

        /**
         * Merges the function metadata of `source` into `data`.
         *
         * Merging metadata reduces the number of wrappers used to invoke a function.
         * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
         * may be applied regardless of execution order. Methods like `_.ary` and
         * `_.rearg` modify function arguments, making the order in which they are
         * executed important, preventing the merging of metadata. However, we make
         * an exception for a safe combined case where curried functions have `_.ary`
         * and or `_.rearg` applied.
         *
         * @private
         * @param {Array} data The destination metadata.
         * @param {Array} source The source metadata.
         * @returns {Array} Returns `data`.
         */
        function mergeData(data, source) {
          var bitmask = data[1],
              srcBitmask = source[1],
              newBitmask = bitmask | srcBitmask,
              isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);

          var isCombo =
            ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
            ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
            ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));

          // Exit early if metadata can't be merged.
          if (!(isCommon || isCombo)) {
            return data;
          }
          // Use source `thisArg` if available.
          if (srcBitmask & WRAP_BIND_FLAG) {
            data[2] = source[2];
            // Set when currying a bound function.
            newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
          }
          // Compose partial arguments.
          var value = source[3];
          if (value) {
            var partials = data[3];
            data[3] = partials ? composeArgs(partials, value, source[4]) : value;
            data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
          }
          // Compose partial right arguments.
          value = source[5];
          if (value) {
            partials = data[5];
            data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
            data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
          }
          // Use source `argPos` if available.
          value = source[7];
          if (value) {
            data[7] = value;
          }
          // Use source `ary` if it's smaller.
          if (srcBitmask & WRAP_ARY_FLAG) {
            data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
          }
          // Use source `arity` if one is not provided.
          if (data[9] == null) {
            data[9] = source[9];
          }
          // Use source `func` and merge bitmasks.
          data[0] = source[0];
          data[1] = newBitmask;

          return data;
        }

        /**
         * This function is like
         * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
         * except that it includes inherited enumerable properties.
         *
         * @private
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property names.
         */
        function nativeKeysIn(object) {
          var result = [];
          if (object != null) {
            for (var key in Object(object)) {
              result.push(key);
            }
          }
          return result;
        }

        /**
         * Converts `value` to a string using `Object.prototype.toString`.
         *
         * @private
         * @param {*} value The value to convert.
         * @returns {string} Returns the converted string.
         */
        function objectToString(value) {
          return nativeObjectToString.call(value);
        }

        /**
         * A specialized version of `baseRest` which transforms the rest array.
         *
         * @private
         * @param {Function} func The function to apply a rest parameter to.
         * @param {number} [start=func.length-1] The start position of the rest parameter.
         * @param {Function} transform The rest array transform.
         * @returns {Function} Returns the new function.
         */
        function overRest(func, start, transform) {
          start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
          return function() {
            var args = arguments,
                index = -1,
                length = nativeMax(args.length - start, 0),
                array = Array(length);

            while (++index < length) {
              array[index] = args[start + index];
            }
            index = -1;
            var otherArgs = Array(start + 1);
            while (++index < start) {
              otherArgs[index] = args[index];
            }
            otherArgs[start] = transform(array);
            return apply(func, this, otherArgs);
          };
        }

        /**
         * Gets the parent value at `path` of `object`.
         *
         * @private
         * @param {Object} object The object to query.
         * @param {Array} path The path to get the parent value of.
         * @returns {*} Returns the parent value.
         */
        function parent(object, path) {
          return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
        }

        /**
         * Reorder `array` according to the specified indexes where the element at
         * the first index is assigned as the first element, the element at
         * the second index is assigned as the second element, and so on.
         *
         * @private
         * @param {Array} array The array to reorder.
         * @param {Array} indexes The arranged array indexes.
         * @returns {Array} Returns `array`.
         */
        function reorder(array, indexes) {
          var arrLength = array.length,
              length = nativeMin(indexes.length, arrLength),
              oldArray = copyArray(array);

          while (length--) {
            var index = indexes[length];
            array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
          }
          return array;
        }

        /**
         * Sets metadata for `func`.
         *
         * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
         * period of time, it will trip its breaker and transition to an identity
         * function to avoid garbage collection pauses in V8. See
         * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
         * for more details.
         *
         * @private
         * @param {Function} func The function to associate metadata with.
         * @param {*} data The metadata.
         * @returns {Function} Returns `func`.
         */
        var setData = shortOut(baseSetData);

        /**
         * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
         *
         * @private
         * @param {Function} func The function to delay.
         * @param {number} wait The number of milliseconds to delay invocation.
         * @returns {number|Object} Returns the timer id or timeout object.
         */
        var setTimeout = ctxSetTimeout || function(func, wait) {
          return root.setTimeout(func, wait);
        };

        /**
         * Sets the `toString` method of `func` to return `string`.
         *
         * @private
         * @param {Function} func The function to modify.
         * @param {Function} string The `toString` result.
         * @returns {Function} Returns `func`.
         */
        var setToString = shortOut(baseSetToString);

        /**
         * Sets the `toString` method of `wrapper` to mimic the source of `reference`
         * with wrapper details in a comment at the top of the source body.
         *
         * @private
         * @param {Function} wrapper The function to modify.
         * @param {Function} reference The reference function.
         * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
         * @returns {Function} Returns `wrapper`.
         */
        function setWrapToString(wrapper, reference, bitmask) {
          var source = (reference + '');
          return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
        }

        /**
         * Creates a function that'll short out and invoke `identity` instead
         * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
         * milliseconds.
         *
         * @private
         * @param {Function} func The function to restrict.
         * @returns {Function} Returns the new shortable function.
         */
        function shortOut(func) {
          var count = 0,
              lastCalled = 0;

          return function() {
            var stamp = nativeNow(),
                remaining = HOT_SPAN - (stamp - lastCalled);

            lastCalled = stamp;
            if (remaining > 0) {
              if (++count >= HOT_COUNT) {
                return arguments[0];
              }
            } else {
              count = 0;
            }
            return func.apply(undefined, arguments);
          };
        }

        /**
         * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
         *
         * @private
         * @param {Array} array The array to shuffle.
         * @param {number} [size=array.length] The size of `array`.
         * @returns {Array} Returns `array`.
         */
        function shuffleSelf(array, size) {
          var index = -1,
              length = array.length,
              lastIndex = length - 1;

          size = size === undefined ? length : size;
          while (++index < size) {
            var rand = baseRandom(index, lastIndex),
                value = array[rand];

            array[rand] = array[index];
            array[index] = value;
          }
          array.length = size;
          return array;
        }

        /**
         * Converts `string` to a property path array.
         *
         * @private
         * @param {string} string The string to convert.
         * @returns {Array} Returns the property path array.
         */
        var stringToPath = memoizeCapped(function(string) {
          var result = [];
          if (reLeadingDot.test(string)) {
            result.push('');
          }
          string.replace(rePropName, function(match, number, quote, string) {
            result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
          });
          return result;
        });

        /**
         * Converts `value` to a string key if it's not a string or symbol.
         *
         * @private
         * @param {*} value The value to inspect.
         * @returns {string|symbol} Returns the key.
         */
        function toKey(value) {
          if (typeof value == 'string' || isSymbol(value)) {
            return value;
          }
          var result = (value + '');
          return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
        }

        /**
         * Converts `func` to its source code.
         *
         * @private
         * @param {Function} func The function to convert.
         * @returns {string} Returns the source code.
         */
        function toSource(func) {
          if (func != null) {
            try {
              return funcToString.call(func);
            } catch (e) {}
            try {
              return (func + '');
            } catch (e) {}
          }
          return '';
        }

        /**
         * Updates wrapper `details` based on `bitmask` flags.
         *
         * @private
         * @returns {Array} details The details to modify.
         * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
         * @returns {Array} Returns `details`.
         */
        function updateWrapDetails(details, bitmask) {
          arrayEach(wrapFlags, function(pair) {
            var value = '_.' + pair[0];
            if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
              details.push(value);
            }
          });
          return details.sort();
        }

        /**
         * Creates a clone of `wrapper`.
         *
         * @private
         * @param {Object} wrapper The wrapper to clone.
         * @returns {Object} Returns the cloned wrapper.
         */
        function wrapperClone(wrapper) {
          if (wrapper instanceof LazyWrapper) {
            return wrapper.clone();
          }
          var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
          result.__actions__ = copyArray(wrapper.__actions__);
          result.__index__  = wrapper.__index__;
          result.__values__ = wrapper.__values__;
          return result;
        }

        /*------------------------------------------------------------------------*/

        /**
         * Creates an array of elements split into groups the length of `size`.
         * If `array` can't be split evenly, the final chunk will be the remaining
         * elements.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to process.
         * @param {number} [size=1] The length of each chunk
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Array} Returns the new array of chunks.
         * @example
         *
         * _.chunk(['a', 'b', 'c', 'd'], 2);
         * // => [['a', 'b'], ['c', 'd']]
         *
         * _.chunk(['a', 'b', 'c', 'd'], 3);
         * // => [['a', 'b', 'c'], ['d']]
         */
        function chunk(array, size, guard) {
          if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
            size = 1;
          } else {
            size = nativeMax(toInteger(size), 0);
          }
          var length = array == null ? 0 : array.length;
          if (!length || size < 1) {
            return [];
          }
          var index = 0,
              resIndex = 0,
              result = Array(nativeCeil(length / size));

          while (index < length) {
            result[resIndex++] = baseSlice(array, index, (index += size));
          }
          return result;
        }

        /**
         * Creates an array with all falsey values removed. The values `false`, `null`,
         * `0`, `""`, `undefined`, and `NaN` are falsey.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to compact.
         * @returns {Array} Returns the new array of filtered values.
         * @example
         *
         * _.compact([0, 1, false, 2, '', 3]);
         * // => [1, 2, 3]
         */
        function compact(array) {
          var index = -1,
              length = array == null ? 0 : array.length,
              resIndex = 0,
              result = [];

          while (++index < length) {
            var value = array[index];
            if (value) {
              result[resIndex++] = value;
            }
          }
          return result;
        }

        /**
         * Creates a new array concatenating `array` with any additional arrays
         * and/or values.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to concatenate.
         * @param {...*} [values] The values to concatenate.
         * @returns {Array} Returns the new concatenated array.
         * @example
         *
         * var array = [1];
         * var other = _.concat(array, 2, [3], [[4]]);
         *
         * console.log(other);
         * // => [1, 2, 3, [4]]
         *
         * console.log(array);
         * // => [1]
         */
        function concat() {
          var length = arguments.length;
          if (!length) {
            return [];
          }
          var args = Array(length - 1),
              array = arguments[0],
              index = length;

          while (index--) {
            args[index - 1] = arguments[index];
          }
          return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
        }

        /**
         * Creates an array of `array` values not included in the other given arrays
         * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * for equality comparisons. The order and references of result values are
         * determined by the first array.
         *
         * **Note:** Unlike `_.pullAll`, this method returns a new array.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {...Array} [values] The values to exclude.
         * @returns {Array} Returns the new array of filtered values.
         * @see _.without, _.xor
         * @example
         *
         * _.difference([2, 1], [2, 3]);
         * // => [1]
         */
        var difference = baseRest(function(array, values) {
          return isArrayLikeObject(array)
            ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
            : [];
        });

        /**
         * This method is like `_.difference` except that it accepts `iteratee` which
         * is invoked for each element of `array` and `values` to generate the criterion
         * by which they're compared. The order and references of result values are
         * determined by the first array. The iteratee is invoked with one argument:
         * (value).
         *
         * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {...Array} [values] The values to exclude.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {Array} Returns the new array of filtered values.
         * @example
         *
         * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
         * // => [1.2]
         *
         * // The `_.property` iteratee shorthand.
         * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
         * // => [{ 'x': 2 }]
         */
        var differenceBy = baseRest(function(array, values) {
          var iteratee = last(values);
          if (isArrayLikeObject(iteratee)) {
            iteratee = undefined;
          }
          return isArrayLikeObject(array)
            ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
            : [];
        });

        /**
         * This method is like `_.difference` except that it accepts `comparator`
         * which is invoked to compare elements of `array` to `values`. The order and
         * references of result values are determined by the first array. The comparator
         * is invoked with two arguments: (arrVal, othVal).
         *
         * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {...Array} [values] The values to exclude.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new array of filtered values.
         * @example
         *
         * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
         *
         * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
         * // => [{ 'x': 2, 'y': 1 }]
         */
        var differenceWith = baseRest(function(array, values) {
          var comparator = last(values);
          if (isArrayLikeObject(comparator)) {
            comparator = undefined;
          }
          return isArrayLikeObject(array)
            ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
            : [];
        });

        /**
         * Creates a slice of `array` with `n` elements dropped from the beginning.
         *
         * @static
         * @memberOf _
         * @since 0.5.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {number} [n=1] The number of elements to drop.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * _.drop([1, 2, 3]);
         * // => [2, 3]
         *
         * _.drop([1, 2, 3], 2);
         * // => [3]
         *
         * _.drop([1, 2, 3], 5);
         * // => []
         *
         * _.drop([1, 2, 3], 0);
         * // => [1, 2, 3]
         */
        function drop(array, n, guard) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return [];
          }
          n = (guard || n === undefined) ? 1 : toInteger(n);
          return baseSlice(array, n < 0 ? 0 : n, length);
        }

        /**
         * Creates a slice of `array` with `n` elements dropped from the end.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {number} [n=1] The number of elements to drop.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * _.dropRight([1, 2, 3]);
         * // => [1, 2]
         *
         * _.dropRight([1, 2, 3], 2);
         * // => [1]
         *
         * _.dropRight([1, 2, 3], 5);
         * // => []
         *
         * _.dropRight([1, 2, 3], 0);
         * // => [1, 2, 3]
         */
        function dropRight(array, n, guard) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return [];
          }
          n = (guard || n === undefined) ? 1 : toInteger(n);
          n = length - n;
          return baseSlice(array, 0, n < 0 ? 0 : n);
        }

        /**
         * Creates a slice of `array` excluding elements dropped from the end.
         * Elements are dropped until `predicate` returns falsey. The predicate is
         * invoked with three arguments: (value, index, array).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'active': true },
         *   { 'user': 'fred',    'active': false },
         *   { 'user': 'pebbles', 'active': false }
         * ];
         *
         * _.dropRightWhile(users, function(o) { return !o.active; });
         * // => objects for ['barney']
         *
         * // The `_.matches` iteratee shorthand.
         * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
         * // => objects for ['barney', 'fred']
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.dropRightWhile(users, ['active', false]);
         * // => objects for ['barney']
         *
         * // The `_.property` iteratee shorthand.
         * _.dropRightWhile(users, 'active');
         * // => objects for ['barney', 'fred', 'pebbles']
         */
        function dropRightWhile(array, predicate) {
          return (array && array.length)
            ? baseWhile(array, getIteratee(predicate, 3), true, true)
            : [];
        }

        /**
         * Creates a slice of `array` excluding elements dropped from the beginning.
         * Elements are dropped until `predicate` returns falsey. The predicate is
         * invoked with three arguments: (value, index, array).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'active': false },
         *   { 'user': 'fred',    'active': false },
         *   { 'user': 'pebbles', 'active': true }
         * ];
         *
         * _.dropWhile(users, function(o) { return !o.active; });
         * // => objects for ['pebbles']
         *
         * // The `_.matches` iteratee shorthand.
         * _.dropWhile(users, { 'user': 'barney', 'active': false });
         * // => objects for ['fred', 'pebbles']
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.dropWhile(users, ['active', false]);
         * // => objects for ['pebbles']
         *
         * // The `_.property` iteratee shorthand.
         * _.dropWhile(users, 'active');
         * // => objects for ['barney', 'fred', 'pebbles']
         */
        function dropWhile(array, predicate) {
          return (array && array.length)
            ? baseWhile(array, getIteratee(predicate, 3), true)
            : [];
        }

        /**
         * Fills elements of `array` with `value` from `start` up to, but not
         * including, `end`.
         *
         * **Note:** This method mutates `array`.
         *
         * @static
         * @memberOf _
         * @since 3.2.0
         * @category Array
         * @param {Array} array The array to fill.
         * @param {*} value The value to fill `array` with.
         * @param {number} [start=0] The start position.
         * @param {number} [end=array.length] The end position.
         * @returns {Array} Returns `array`.
         * @example
         *
         * var array = [1, 2, 3];
         *
         * _.fill(array, 'a');
         * console.log(array);
         * // => ['a', 'a', 'a']
         *
         * _.fill(Array(3), 2);
         * // => [2, 2, 2]
         *
         * _.fill([4, 6, 8, 10], '*', 1, 3);
         * // => [4, '*', '*', 10]
         */
        function fill(array, value, start, end) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return [];
          }
          if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
            start = 0;
            end = length;
          }
          return baseFill(array, value, start, end);
        }

        /**
         * This method is like `_.find` except that it returns the index of the first
         * element `predicate` returns truthy for instead of the element itself.
         *
         * @static
         * @memberOf _
         * @since 1.1.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @param {number} [fromIndex=0] The index to search from.
         * @returns {number} Returns the index of the found element, else `-1`.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'active': false },
         *   { 'user': 'fred',    'active': false },
         *   { 'user': 'pebbles', 'active': true }
         * ];
         *
         * _.findIndex(users, function(o) { return o.user == 'barney'; });
         * // => 0
         *
         * // The `_.matches` iteratee shorthand.
         * _.findIndex(users, { 'user': 'fred', 'active': false });
         * // => 1
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.findIndex(users, ['active', false]);
         * // => 0
         *
         * // The `_.property` iteratee shorthand.
         * _.findIndex(users, 'active');
         * // => 2
         */
        function findIndex(array, predicate, fromIndex) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return -1;
          }
          var index = fromIndex == null ? 0 : toInteger(fromIndex);
          if (index < 0) {
            index = nativeMax(length + index, 0);
          }
          return baseFindIndex(array, getIteratee(predicate, 3), index);
        }

        /**
         * This method is like `_.findIndex` except that it iterates over elements
         * of `collection` from right to left.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @param {number} [fromIndex=array.length-1] The index to search from.
         * @returns {number} Returns the index of the found element, else `-1`.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'active': true },
         *   { 'user': 'fred',    'active': false },
         *   { 'user': 'pebbles', 'active': false }
         * ];
         *
         * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
         * // => 2
         *
         * // The `_.matches` iteratee shorthand.
         * _.findLastIndex(users, { 'user': 'barney', 'active': true });
         * // => 0
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.findLastIndex(users, ['active', false]);
         * // => 2
         *
         * // The `_.property` iteratee shorthand.
         * _.findLastIndex(users, 'active');
         * // => 0
         */
        function findLastIndex(array, predicate, fromIndex) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return -1;
          }
          var index = length - 1;
          if (fromIndex !== undefined) {
            index = toInteger(fromIndex);
            index = fromIndex < 0
              ? nativeMax(length + index, 0)
              : nativeMin(index, length - 1);
          }
          return baseFindIndex(array, getIteratee(predicate, 3), index, true);
        }

        /**
         * Flattens `array` a single level deep.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to flatten.
         * @returns {Array} Returns the new flattened array.
         * @example
         *
         * _.flatten([1, [2, [3, [4]], 5]]);
         * // => [1, 2, [3, [4]], 5]
         */
        function flatten(array) {
          var length = array == null ? 0 : array.length;
          return length ? baseFlatten(array, 1) : [];
        }

        /**
         * Recursively flattens `array`.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to flatten.
         * @returns {Array} Returns the new flattened array.
         * @example
         *
         * _.flattenDeep([1, [2, [3, [4]], 5]]);
         * // => [1, 2, 3, 4, 5]
         */
        function flattenDeep(array) {
          var length = array == null ? 0 : array.length;
          return length ? baseFlatten(array, INFINITY) : [];
        }

        /**
         * Recursively flatten `array` up to `depth` times.
         *
         * @static
         * @memberOf _
         * @since 4.4.0
         * @category Array
         * @param {Array} array The array to flatten.
         * @param {number} [depth=1] The maximum recursion depth.
         * @returns {Array} Returns the new flattened array.
         * @example
         *
         * var array = [1, [2, [3, [4]], 5]];
         *
         * _.flattenDepth(array, 1);
         * // => [1, 2, [3, [4]], 5]
         *
         * _.flattenDepth(array, 2);
         * // => [1, 2, 3, [4], 5]
         */
        function flattenDepth(array, depth) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return [];
          }
          depth = depth === undefined ? 1 : toInteger(depth);
          return baseFlatten(array, depth);
        }

        /**
         * The inverse of `_.toPairs`; this method returns an object composed
         * from key-value `pairs`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} pairs The key-value pairs.
         * @returns {Object} Returns the new object.
         * @example
         *
         * _.fromPairs([['a', 1], ['b', 2]]);
         * // => { 'a': 1, 'b': 2 }
         */
        function fromPairs(pairs) {
          var index = -1,
              length = pairs == null ? 0 : pairs.length,
              result = {};

          while (++index < length) {
            var pair = pairs[index];
            result[pair[0]] = pair[1];
          }
          return result;
        }

        /**
         * Gets the first element of `array`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @alias first
         * @category Array
         * @param {Array} array The array to query.
         * @returns {*} Returns the first element of `array`.
         * @example
         *
         * _.head([1, 2, 3]);
         * // => 1
         *
         * _.head([]);
         * // => undefined
         */
        function head(array) {
          return (array && array.length) ? array[0] : undefined;
        }

        /**
         * Gets the index at which the first occurrence of `value` is found in `array`
         * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * for equality comparisons. If `fromIndex` is negative, it's used as the
         * offset from the end of `array`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {*} value The value to search for.
         * @param {number} [fromIndex=0] The index to search from.
         * @returns {number} Returns the index of the matched value, else `-1`.
         * @example
         *
         * _.indexOf([1, 2, 1, 2], 2);
         * // => 1
         *
         * // Search from the `fromIndex`.
         * _.indexOf([1, 2, 1, 2], 2, 2);
         * // => 3
         */
        function indexOf(array, value, fromIndex) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return -1;
          }
          var index = fromIndex == null ? 0 : toInteger(fromIndex);
          if (index < 0) {
            index = nativeMax(length + index, 0);
          }
          return baseIndexOf(array, value, index);
        }

        /**
         * Gets all but the last element of `array`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to query.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * _.initial([1, 2, 3]);
         * // => [1, 2]
         */
        function initial(array) {
          var length = array == null ? 0 : array.length;
          return length ? baseSlice(array, 0, -1) : [];
        }

        /**
         * Creates an array of unique values that are included in all given arrays
         * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * for equality comparisons. The order and references of result values are
         * determined by the first array.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @returns {Array} Returns the new array of intersecting values.
         * @example
         *
         * _.intersection([2, 1], [2, 3]);
         * // => [2]
         */
        var intersection = baseRest(function(arrays) {
          var mapped = arrayMap(arrays, castArrayLikeObject);
          return (mapped.length && mapped[0] === arrays[0])
            ? baseIntersection(mapped)
            : [];
        });

        /**
         * This method is like `_.intersection` except that it accepts `iteratee`
         * which is invoked for each element of each `arrays` to generate the criterion
         * by which they're compared. The order and references of result values are
         * determined by the first array. The iteratee is invoked with one argument:
         * (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {Array} Returns the new array of intersecting values.
         * @example
         *
         * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
         * // => [2.1]
         *
         * // The `_.property` iteratee shorthand.
         * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
         * // => [{ 'x': 1 }]
         */
        var intersectionBy = baseRest(function(arrays) {
          var iteratee = last(arrays),
              mapped = arrayMap(arrays, castArrayLikeObject);

          if (iteratee === last(mapped)) {
            iteratee = undefined;
          } else {
            mapped.pop();
          }
          return (mapped.length && mapped[0] === arrays[0])
            ? baseIntersection(mapped, getIteratee(iteratee, 2))
            : [];
        });

        /**
         * This method is like `_.intersection` except that it accepts `comparator`
         * which is invoked to compare elements of `arrays`. The order and references
         * of result values are determined by the first array. The comparator is
         * invoked with two arguments: (arrVal, othVal).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new array of intersecting values.
         * @example
         *
         * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
         * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
         *
         * _.intersectionWith(objects, others, _.isEqual);
         * // => [{ 'x': 1, 'y': 2 }]
         */
        var intersectionWith = baseRest(function(arrays) {
          var comparator = last(arrays),
              mapped = arrayMap(arrays, castArrayLikeObject);

          comparator = typeof comparator == 'function' ? comparator : undefined;
          if (comparator) {
            mapped.pop();
          }
          return (mapped.length && mapped[0] === arrays[0])
            ? baseIntersection(mapped, undefined, comparator)
            : [];
        });

        /**
         * Converts all elements in `array` into a string separated by `separator`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to convert.
         * @param {string} [separator=','] The element separator.
         * @returns {string} Returns the joined string.
         * @example
         *
         * _.join(['a', 'b', 'c'], '~');
         * // => 'a~b~c'
         */
        function join(array, separator) {
          return array == null ? '' : nativeJoin.call(array, separator);
        }

        /**
         * Gets the last element of `array`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to query.
         * @returns {*} Returns the last element of `array`.
         * @example
         *
         * _.last([1, 2, 3]);
         * // => 3
         */
        function last(array) {
          var length = array == null ? 0 : array.length;
          return length ? array[length - 1] : undefined;
        }

        /**
         * This method is like `_.indexOf` except that it iterates over elements of
         * `array` from right to left.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {*} value The value to search for.
         * @param {number} [fromIndex=array.length-1] The index to search from.
         * @returns {number} Returns the index of the matched value, else `-1`.
         * @example
         *
         * _.lastIndexOf([1, 2, 1, 2], 2);
         * // => 3
         *
         * // Search from the `fromIndex`.
         * _.lastIndexOf([1, 2, 1, 2], 2, 2);
         * // => 1
         */
        function lastIndexOf(array, value, fromIndex) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return -1;
          }
          var index = length;
          if (fromIndex !== undefined) {
            index = toInteger(fromIndex);
            index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
          }
          return value === value
            ? strictLastIndexOf(array, value, index)
            : baseFindIndex(array, baseIsNaN, index, true);
        }

        /**
         * Gets the element at index `n` of `array`. If `n` is negative, the nth
         * element from the end is returned.
         *
         * @static
         * @memberOf _
         * @since 4.11.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {number} [n=0] The index of the element to return.
         * @returns {*} Returns the nth element of `array`.
         * @example
         *
         * var array = ['a', 'b', 'c', 'd'];
         *
         * _.nth(array, 1);
         * // => 'b'
         *
         * _.nth(array, -2);
         * // => 'c';
         */
        function nth(array, n) {
          return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
        }

        /**
         * Removes all given values from `array` using
         * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * for equality comparisons.
         *
         * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
         * to remove elements from an array by predicate.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Array
         * @param {Array} array The array to modify.
         * @param {...*} [values] The values to remove.
         * @returns {Array} Returns `array`.
         * @example
         *
         * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
         *
         * _.pull(array, 'a', 'c');
         * console.log(array);
         * // => ['b', 'b']
         */
        var pull = baseRest(pullAll);

        /**
         * This method is like `_.pull` except that it accepts an array of values to remove.
         *
         * **Note:** Unlike `_.difference`, this method mutates `array`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to modify.
         * @param {Array} values The values to remove.
         * @returns {Array} Returns `array`.
         * @example
         *
         * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
         *
         * _.pullAll(array, ['a', 'c']);
         * console.log(array);
         * // => ['b', 'b']
         */
        function pullAll(array, values) {
          return (array && array.length && values && values.length)
            ? basePullAll(array, values)
            : array;
        }

        /**
         * This method is like `_.pullAll` except that it accepts `iteratee` which is
         * invoked for each element of `array` and `values` to generate the criterion
         * by which they're compared. The iteratee is invoked with one argument: (value).
         *
         * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to modify.
         * @param {Array} values The values to remove.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {Array} Returns `array`.
         * @example
         *
         * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
         *
         * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
         * console.log(array);
         * // => [{ 'x': 2 }]
         */
        function pullAllBy(array, values, iteratee) {
          return (array && array.length && values && values.length)
            ? basePullAll(array, values, getIteratee(iteratee, 2))
            : array;
        }

        /**
         * This method is like `_.pullAll` except that it accepts `comparator` which
         * is invoked to compare elements of `array` to `values`. The comparator is
         * invoked with two arguments: (arrVal, othVal).
         *
         * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
         *
         * @static
         * @memberOf _
         * @since 4.6.0
         * @category Array
         * @param {Array} array The array to modify.
         * @param {Array} values The values to remove.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns `array`.
         * @example
         *
         * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
         *
         * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
         * console.log(array);
         * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
         */
        function pullAllWith(array, values, comparator) {
          return (array && array.length && values && values.length)
            ? basePullAll(array, values, undefined, comparator)
            : array;
        }

        /**
         * Removes elements from `array` corresponding to `indexes` and returns an
         * array of removed elements.
         *
         * **Note:** Unlike `_.at`, this method mutates `array`.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to modify.
         * @param {...(number|number[])} [indexes] The indexes of elements to remove.
         * @returns {Array} Returns the new array of removed elements.
         * @example
         *
         * var array = ['a', 'b', 'c', 'd'];
         * var pulled = _.pullAt(array, [1, 3]);
         *
         * console.log(array);
         * // => ['a', 'c']
         *
         * console.log(pulled);
         * // => ['b', 'd']
         */
        var pullAt = flatRest(function(array, indexes) {
          var length = array == null ? 0 : array.length,
              result = baseAt(array, indexes);

          basePullAt(array, arrayMap(indexes, function(index) {
            return isIndex(index, length) ? +index : index;
          }).sort(compareAscending));

          return result;
        });

        /**
         * Removes all elements from `array` that `predicate` returns truthy for
         * and returns an array of the removed elements. The predicate is invoked
         * with three arguments: (value, index, array).
         *
         * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
         * to pull elements from an array by value.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Array
         * @param {Array} array The array to modify.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the new array of removed elements.
         * @example
         *
         * var array = [1, 2, 3, 4];
         * var evens = _.remove(array, function(n) {
         *   return n % 2 == 0;
         * });
         *
         * console.log(array);
         * // => [1, 3]
         *
         * console.log(evens);
         * // => [2, 4]
         */
        function remove(array, predicate) {
          var result = [];
          if (!(array && array.length)) {
            return result;
          }
          var index = -1,
              indexes = [],
              length = array.length;

          predicate = getIteratee(predicate, 3);
          while (++index < length) {
            var value = array[index];
            if (predicate(value, index, array)) {
              result.push(value);
              indexes.push(index);
            }
          }
          basePullAt(array, indexes);
          return result;
        }

        /**
         * Reverses `array` so that the first element becomes the last, the second
         * element becomes the second to last, and so on.
         *
         * **Note:** This method mutates `array` and is based on
         * [`Array#reverse`](https://mdn.io/Array/reverse).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to modify.
         * @returns {Array} Returns `array`.
         * @example
         *
         * var array = [1, 2, 3];
         *
         * _.reverse(array);
         * // => [3, 2, 1]
         *
         * console.log(array);
         * // => [3, 2, 1]
         */
        function reverse(array) {
          return array == null ? array : nativeReverse.call(array);
        }

        /**
         * Creates a slice of `array` from `start` up to, but not including, `end`.
         *
         * **Note:** This method is used instead of
         * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
         * returned.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to slice.
         * @param {number} [start=0] The start position.
         * @param {number} [end=array.length] The end position.
         * @returns {Array} Returns the slice of `array`.
         */
        function slice(array, start, end) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return [];
          }
          if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
            start = 0;
            end = length;
          }
          else {
            start = start == null ? 0 : toInteger(start);
            end = end === undefined ? length : toInteger(end);
          }
          return baseSlice(array, start, end);
        }

        /**
         * Uses a binary search to determine the lowest index at which `value`
         * should be inserted into `array` in order to maintain its sort order.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The sorted array to inspect.
         * @param {*} value The value to evaluate.
         * @returns {number} Returns the index at which `value` should be inserted
         *  into `array`.
         * @example
         *
         * _.sortedIndex([30, 50], 40);
         * // => 1
         */
        function sortedIndex(array, value) {
          return baseSortedIndex(array, value);
        }

        /**
         * This method is like `_.sortedIndex` except that it accepts `iteratee`
         * which is invoked for `value` and each element of `array` to compute their
         * sort ranking. The iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The sorted array to inspect.
         * @param {*} value The value to evaluate.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {number} Returns the index at which `value` should be inserted
         *  into `array`.
         * @example
         *
         * var objects = [{ 'x': 4 }, { 'x': 5 }];
         *
         * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
         * // => 0
         *
         * // The `_.property` iteratee shorthand.
         * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
         * // => 0
         */
        function sortedIndexBy(array, value, iteratee) {
          return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
        }

        /**
         * This method is like `_.indexOf` except that it performs a binary
         * search on a sorted `array`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {*} value The value to search for.
         * @returns {number} Returns the index of the matched value, else `-1`.
         * @example
         *
         * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
         * // => 1
         */
        function sortedIndexOf(array, value) {
          var length = array == null ? 0 : array.length;
          if (length) {
            var index = baseSortedIndex(array, value);
            if (index < length && eq(array[index], value)) {
              return index;
            }
          }
          return -1;
        }

        /**
         * This method is like `_.sortedIndex` except that it returns the highest
         * index at which `value` should be inserted into `array` in order to
         * maintain its sort order.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The sorted array to inspect.
         * @param {*} value The value to evaluate.
         * @returns {number} Returns the index at which `value` should be inserted
         *  into `array`.
         * @example
         *
         * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
         * // => 4
         */
        function sortedLastIndex(array, value) {
          return baseSortedIndex(array, value, true);
        }

        /**
         * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
         * which is invoked for `value` and each element of `array` to compute their
         * sort ranking. The iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The sorted array to inspect.
         * @param {*} value The value to evaluate.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {number} Returns the index at which `value` should be inserted
         *  into `array`.
         * @example
         *
         * var objects = [{ 'x': 4 }, { 'x': 5 }];
         *
         * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
         * // => 1
         *
         * // The `_.property` iteratee shorthand.
         * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
         * // => 1
         */
        function sortedLastIndexBy(array, value, iteratee) {
          return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
        }

        /**
         * This method is like `_.lastIndexOf` except that it performs a binary
         * search on a sorted `array`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {*} value The value to search for.
         * @returns {number} Returns the index of the matched value, else `-1`.
         * @example
         *
         * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
         * // => 3
         */
        function sortedLastIndexOf(array, value) {
          var length = array == null ? 0 : array.length;
          if (length) {
            var index = baseSortedIndex(array, value, true) - 1;
            if (eq(array[index], value)) {
              return index;
            }
          }
          return -1;
        }

        /**
         * This method is like `_.uniq` except that it's designed and optimized
         * for sorted arrays.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @returns {Array} Returns the new duplicate free array.
         * @example
         *
         * _.sortedUniq([1, 1, 2]);
         * // => [1, 2]
         */
        function sortedUniq(array) {
          return (array && array.length)
            ? baseSortedUniq(array)
            : [];
        }

        /**
         * This method is like `_.uniqBy` except that it's designed and optimized
         * for sorted arrays.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {Function} [iteratee] The iteratee invoked per element.
         * @returns {Array} Returns the new duplicate free array.
         * @example
         *
         * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
         * // => [1.1, 2.3]
         */
        function sortedUniqBy(array, iteratee) {
          return (array && array.length)
            ? baseSortedUniq(array, getIteratee(iteratee, 2))
            : [];
        }

        /**
         * Gets all but the first element of `array`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to query.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * _.tail([1, 2, 3]);
         * // => [2, 3]
         */
        function tail(array) {
          var length = array == null ? 0 : array.length;
          return length ? baseSlice(array, 1, length) : [];
        }

        /**
         * Creates a slice of `array` with `n` elements taken from the beginning.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {number} [n=1] The number of elements to take.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * _.take([1, 2, 3]);
         * // => [1]
         *
         * _.take([1, 2, 3], 2);
         * // => [1, 2]
         *
         * _.take([1, 2, 3], 5);
         * // => [1, 2, 3]
         *
         * _.take([1, 2, 3], 0);
         * // => []
         */
        function take(array, n, guard) {
          if (!(array && array.length)) {
            return [];
          }
          n = (guard || n === undefined) ? 1 : toInteger(n);
          return baseSlice(array, 0, n < 0 ? 0 : n);
        }

        /**
         * Creates a slice of `array` with `n` elements taken from the end.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {number} [n=1] The number of elements to take.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * _.takeRight([1, 2, 3]);
         * // => [3]
         *
         * _.takeRight([1, 2, 3], 2);
         * // => [2, 3]
         *
         * _.takeRight([1, 2, 3], 5);
         * // => [1, 2, 3]
         *
         * _.takeRight([1, 2, 3], 0);
         * // => []
         */
        function takeRight(array, n, guard) {
          var length = array == null ? 0 : array.length;
          if (!length) {
            return [];
          }
          n = (guard || n === undefined) ? 1 : toInteger(n);
          n = length - n;
          return baseSlice(array, n < 0 ? 0 : n, length);
        }

        /**
         * Creates a slice of `array` with elements taken from the end. Elements are
         * taken until `predicate` returns falsey. The predicate is invoked with
         * three arguments: (value, index, array).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'active': true },
         *   { 'user': 'fred',    'active': false },
         *   { 'user': 'pebbles', 'active': false }
         * ];
         *
         * _.takeRightWhile(users, function(o) { return !o.active; });
         * // => objects for ['fred', 'pebbles']
         *
         * // The `_.matches` iteratee shorthand.
         * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
         * // => objects for ['pebbles']
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.takeRightWhile(users, ['active', false]);
         * // => objects for ['fred', 'pebbles']
         *
         * // The `_.property` iteratee shorthand.
         * _.takeRightWhile(users, 'active');
         * // => []
         */
        function takeRightWhile(array, predicate) {
          return (array && array.length)
            ? baseWhile(array, getIteratee(predicate, 3), false, true)
            : [];
        }

        /**
         * Creates a slice of `array` with elements taken from the beginning. Elements
         * are taken until `predicate` returns falsey. The predicate is invoked with
         * three arguments: (value, index, array).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Array
         * @param {Array} array The array to query.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the slice of `array`.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'active': false },
         *   { 'user': 'fred',    'active': false },
         *   { 'user': 'pebbles', 'active': true }
         * ];
         *
         * _.takeWhile(users, function(o) { return !o.active; });
         * // => objects for ['barney', 'fred']
         *
         * // The `_.matches` iteratee shorthand.
         * _.takeWhile(users, { 'user': 'barney', 'active': false });
         * // => objects for ['barney']
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.takeWhile(users, ['active', false]);
         * // => objects for ['barney', 'fred']
         *
         * // The `_.property` iteratee shorthand.
         * _.takeWhile(users, 'active');
         * // => []
         */
        function takeWhile(array, predicate) {
          return (array && array.length)
            ? baseWhile(array, getIteratee(predicate, 3))
            : [];
        }

        /**
         * Creates an array of unique values, in order, from all given arrays using
         * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * for equality comparisons.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @returns {Array} Returns the new array of combined values.
         * @example
         *
         * _.union([2], [1, 2]);
         * // => [2, 1]
         */
        var union = baseRest(function(arrays) {
          return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
        });

        /**
         * This method is like `_.union` except that it accepts `iteratee` which is
         * invoked for each element of each `arrays` to generate the criterion by
         * which uniqueness is computed. Result values are chosen from the first
         * array in which the value occurs. The iteratee is invoked with one argument:
         * (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {Array} Returns the new array of combined values.
         * @example
         *
         * _.unionBy([2.1], [1.2, 2.3], Math.floor);
         * // => [2.1, 1.2]
         *
         * // The `_.property` iteratee shorthand.
         * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
         * // => [{ 'x': 1 }, { 'x': 2 }]
         */
        var unionBy = baseRest(function(arrays) {
          var iteratee = last(arrays);
          if (isArrayLikeObject(iteratee)) {
            iteratee = undefined;
          }
          return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
        });

        /**
         * This method is like `_.union` except that it accepts `comparator` which
         * is invoked to compare elements of `arrays`. Result values are chosen from
         * the first array in which the value occurs. The comparator is invoked
         * with two arguments: (arrVal, othVal).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new array of combined values.
         * @example
         *
         * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
         * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
         *
         * _.unionWith(objects, others, _.isEqual);
         * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
         */
        var unionWith = baseRest(function(arrays) {
          var comparator = last(arrays);
          comparator = typeof comparator == 'function' ? comparator : undefined;
          return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
        });

        /**
         * Creates a duplicate-free version of an array, using
         * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * for equality comparisons, in which only the first occurrence of each element
         * is kept. The order of result values is determined by the order they occur
         * in the array.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @returns {Array} Returns the new duplicate free array.
         * @example
         *
         * _.uniq([2, 1, 2]);
         * // => [2, 1]
         */
        function uniq(array) {
          return (array && array.length) ? baseUniq(array) : [];
        }

        /**
         * This method is like `_.uniq` except that it accepts `iteratee` which is
         * invoked for each element in `array` to generate the criterion by which
         * uniqueness is computed. The order of result values is determined by the
         * order they occur in the array. The iteratee is invoked with one argument:
         * (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {Array} Returns the new duplicate free array.
         * @example
         *
         * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
         * // => [2.1, 1.2]
         *
         * // The `_.property` iteratee shorthand.
         * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
         * // => [{ 'x': 1 }, { 'x': 2 }]
         */
        function uniqBy(array, iteratee) {
          return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
        }

        /**
         * This method is like `_.uniq` except that it accepts `comparator` which
         * is invoked to compare elements of `array`. The order of result values is
         * determined by the order they occur in the array.The comparator is invoked
         * with two arguments: (arrVal, othVal).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new duplicate free array.
         * @example
         *
         * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
         *
         * _.uniqWith(objects, _.isEqual);
         * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
         */
        function uniqWith(array, comparator) {
          comparator = typeof comparator == 'function' ? comparator : undefined;
          return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
        }

        /**
         * This method is like `_.zip` except that it accepts an array of grouped
         * elements and creates an array regrouping the elements to their pre-zip
         * configuration.
         *
         * @static
         * @memberOf _
         * @since 1.2.0
         * @category Array
         * @param {Array} array The array of grouped elements to process.
         * @returns {Array} Returns the new array of regrouped elements.
         * @example
         *
         * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
         * // => [['a', 1, true], ['b', 2, false]]
         *
         * _.unzip(zipped);
         * // => [['a', 'b'], [1, 2], [true, false]]
         */
        function unzip(array) {
          if (!(array && array.length)) {
            return [];
          }
          var length = 0;
          array = arrayFilter(array, function(group) {
            if (isArrayLikeObject(group)) {
              length = nativeMax(group.length, length);
              return true;
            }
          });
          return baseTimes(length, function(index) {
            return arrayMap(array, baseProperty(index));
          });
        }

        /**
         * This method is like `_.unzip` except that it accepts `iteratee` to specify
         * how regrouped values should be combined. The iteratee is invoked with the
         * elements of each group: (...group).
         *
         * @static
         * @memberOf _
         * @since 3.8.0
         * @category Array
         * @param {Array} array The array of grouped elements to process.
         * @param {Function} [iteratee=_.identity] The function to combine
         *  regrouped values.
         * @returns {Array} Returns the new array of regrouped elements.
         * @example
         *
         * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
         * // => [[1, 10, 100], [2, 20, 200]]
         *
         * _.unzipWith(zipped, _.add);
         * // => [3, 30, 300]
         */
        function unzipWith(array, iteratee) {
          if (!(array && array.length)) {
            return [];
          }
          var result = unzip(array);
          if (iteratee == null) {
            return result;
          }
          return arrayMap(result, function(group) {
            return apply(iteratee, undefined, group);
          });
        }

        /**
         * Creates an array excluding all given values using
         * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * for equality comparisons.
         *
         * **Note:** Unlike `_.pull`, this method returns a new array.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {Array} array The array to inspect.
         * @param {...*} [values] The values to exclude.
         * @returns {Array} Returns the new array of filtered values.
         * @see _.difference, _.xor
         * @example
         *
         * _.without([2, 1, 2, 3], 1, 2);
         * // => [3]
         */
        var without = baseRest(function(array, values) {
          return isArrayLikeObject(array)
            ? baseDifference(array, values)
            : [];
        });

        /**
         * Creates an array of unique values that is the
         * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
         * of the given arrays. The order of result values is determined by the order
         * they occur in the arrays.
         *
         * @static
         * @memberOf _
         * @since 2.4.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @returns {Array} Returns the new array of filtered values.
         * @see _.difference, _.without
         * @example
         *
         * _.xor([2, 1], [2, 3]);
         * // => [1, 3]
         */
        var xor = baseRest(function(arrays) {
          return baseXor(arrayFilter(arrays, isArrayLikeObject));
        });

        /**
         * This method is like `_.xor` except that it accepts `iteratee` which is
         * invoked for each element of each `arrays` to generate the criterion by
         * which by which they're compared. The order of result values is determined
         * by the order they occur in the arrays. The iteratee is invoked with one
         * argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {Array} Returns the new array of filtered values.
         * @example
         *
         * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
         * // => [1.2, 3.4]
         *
         * // The `_.property` iteratee shorthand.
         * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
         * // => [{ 'x': 2 }]
         */
        var xorBy = baseRest(function(arrays) {
          var iteratee = last(arrays);
          if (isArrayLikeObject(iteratee)) {
            iteratee = undefined;
          }
          return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
        });

        /**
         * This method is like `_.xor` except that it accepts `comparator` which is
         * invoked to compare elements of `arrays`. The order of result values is
         * determined by the order they occur in the arrays. The comparator is invoked
         * with two arguments: (arrVal, othVal).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Array
         * @param {...Array} [arrays] The arrays to inspect.
         * @param {Function} [comparator] The comparator invoked per element.
         * @returns {Array} Returns the new array of filtered values.
         * @example
         *
         * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
         * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
         *
         * _.xorWith(objects, others, _.isEqual);
         * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
         */
        var xorWith = baseRest(function(arrays) {
          var comparator = last(arrays);
          comparator = typeof comparator == 'function' ? comparator : undefined;
          return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
        });

        /**
         * Creates an array of grouped elements, the first of which contains the
         * first elements of the given arrays, the second of which contains the
         * second elements of the given arrays, and so on.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Array
         * @param {...Array} [arrays] The arrays to process.
         * @returns {Array} Returns the new array of grouped elements.
         * @example
         *
         * _.zip(['a', 'b'], [1, 2], [true, false]);
         * // => [['a', 1, true], ['b', 2, false]]
         */
        var zip = baseRest(unzip);

        /**
         * This method is like `_.fromPairs` except that it accepts two arrays,
         * one of property identifiers and one of corresponding values.
         *
         * @static
         * @memberOf _
         * @since 0.4.0
         * @category Array
         * @param {Array} [props=[]] The property identifiers.
         * @param {Array} [values=[]] The property values.
         * @returns {Object} Returns the new object.
         * @example
         *
         * _.zipObject(['a', 'b'], [1, 2]);
         * // => { 'a': 1, 'b': 2 }
         */
        function zipObject(props, values) {
          return baseZipObject(props || [], values || [], assignValue);
        }

        /**
         * This method is like `_.zipObject` except that it supports property paths.
         *
         * @static
         * @memberOf _
         * @since 4.1.0
         * @category Array
         * @param {Array} [props=[]] The property identifiers.
         * @param {Array} [values=[]] The property values.
         * @returns {Object} Returns the new object.
         * @example
         *
         * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
         * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
         */
        function zipObjectDeep(props, values) {
          return baseZipObject(props || [], values || [], baseSet);
        }

        /**
         * This method is like `_.zip` except that it accepts `iteratee` to specify
         * how grouped values should be combined. The iteratee is invoked with the
         * elements of each group: (...group).
         *
         * @static
         * @memberOf _
         * @since 3.8.0
         * @category Array
         * @param {...Array} [arrays] The arrays to process.
         * @param {Function} [iteratee=_.identity] The function to combine
         *  grouped values.
         * @returns {Array} Returns the new array of grouped elements.
         * @example
         *
         * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
         *   return a + b + c;
         * });
         * // => [111, 222]
         */
        var zipWith = baseRest(function(arrays) {
          var length = arrays.length,
              iteratee = length > 1 ? arrays[length - 1] : undefined;

          iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
          return unzipWith(arrays, iteratee);
        });

        /*------------------------------------------------------------------------*/

        /**
         * Creates a `lodash` wrapper instance that wraps `value` with explicit method
         * chain sequences enabled. The result of such sequences must be unwrapped
         * with `_#value`.
         *
         * @static
         * @memberOf _
         * @since 1.3.0
         * @category Seq
         * @param {*} value The value to wrap.
         * @returns {Object} Returns the new `lodash` wrapper instance.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'age': 36 },
         *   { 'user': 'fred',    'age': 40 },
         *   { 'user': 'pebbles', 'age': 1 }
         * ];
         *
         * var youngest = _
         *   .chain(users)
         *   .sortBy('age')
         *   .map(function(o) {
         *     return o.user + ' is ' + o.age;
         *   })
         *   .head()
         *   .value();
         * // => 'pebbles is 1'
         */
        function chain(value) {
          var result = lodash(value);
          result.__chain__ = true;
          return result;
        }

        /**
         * This method invokes `interceptor` and returns `value`. The interceptor
         * is invoked with one argument; (value). The purpose of this method is to
         * "tap into" a method chain sequence in order to modify intermediate results.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Seq
         * @param {*} value The value to provide to `interceptor`.
         * @param {Function} interceptor The function to invoke.
         * @returns {*} Returns `value`.
         * @example
         *
         * _([1, 2, 3])
         *  .tap(function(array) {
         *    // Mutate input array.
         *    array.pop();
         *  })
         *  .reverse()
         *  .value();
         * // => [2, 1]
         */
        function tap(value, interceptor) {
          interceptor(value);
          return value;
        }

        /**
         * This method is like `_.tap` except that it returns the result of `interceptor`.
         * The purpose of this method is to "pass thru" values replacing intermediate
         * results in a method chain sequence.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Seq
         * @param {*} value The value to provide to `interceptor`.
         * @param {Function} interceptor The function to invoke.
         * @returns {*} Returns the result of `interceptor`.
         * @example
         *
         * _('  abc  ')
         *  .chain()
         *  .trim()
         *  .thru(function(value) {
         *    return [value];
         *  })
         *  .value();
         * // => ['abc']
         */
        function thru(value, interceptor) {
          return interceptor(value);
        }

        /**
         * This method is the wrapper version of `_.at`.
         *
         * @name at
         * @memberOf _
         * @since 1.0.0
         * @category Seq
         * @param {...(string|string[])} [paths] The property paths to pick.
         * @returns {Object} Returns the new `lodash` wrapper instance.
         * @example
         *
         * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
         *
         * _(object).at(['a[0].b.c', 'a[1]']).value();
         * // => [3, 4]
         */
        var wrapperAt = flatRest(function(paths) {
          var length = paths.length,
              start = length ? paths[0] : 0,
              value = this.__wrapped__,
              interceptor = function(object) { return baseAt(object, paths); };

          if (length > 1 || this.__actions__.length ||
              !(value instanceof LazyWrapper) || !isIndex(start)) {
            return this.thru(interceptor);
          }
          value = value.slice(start, +start + (length ? 1 : 0));
          value.__actions__.push({
            'func': thru,
            'args': [interceptor],
            'thisArg': undefined
          });
          return new LodashWrapper(value, this.__chain__).thru(function(array) {
            if (length && !array.length) {
              array.push(undefined);
            }
            return array;
          });
        });

        /**
         * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
         *
         * @name chain
         * @memberOf _
         * @since 0.1.0
         * @category Seq
         * @returns {Object} Returns the new `lodash` wrapper instance.
         * @example
         *
         * var users = [
         *   { 'user': 'barney', 'age': 36 },
         *   { 'user': 'fred',   'age': 40 }
         * ];
         *
         * // A sequence without explicit chaining.
         * _(users).head();
         * // => { 'user': 'barney', 'age': 36 }
         *
         * // A sequence with explicit chaining.
         * _(users)
         *   .chain()
         *   .head()
         *   .pick('user')
         *   .value();
         * // => { 'user': 'barney' }
         */
        function wrapperChain() {
          return chain(this);
        }

        /**
         * Executes the chain sequence and returns the wrapped result.
         *
         * @name commit
         * @memberOf _
         * @since 3.2.0
         * @category Seq
         * @returns {Object} Returns the new `lodash` wrapper instance.
         * @example
         *
         * var array = [1, 2];
         * var wrapped = _(array).push(3);
         *
         * console.log(array);
         * // => [1, 2]
         *
         * wrapped = wrapped.commit();
         * console.log(array);
         * // => [1, 2, 3]
         *
         * wrapped.last();
         * // => 3
         *
         * console.log(array);
         * // => [1, 2, 3]
         */
        function wrapperCommit() {
          return new LodashWrapper(this.value(), this.__chain__);
        }

        /**
         * Gets the next value on a wrapped object following the
         * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
         *
         * @name next
         * @memberOf _
         * @since 4.0.0
         * @category Seq
         * @returns {Object} Returns the next iterator value.
         * @example
         *
         * var wrapped = _([1, 2]);
         *
         * wrapped.next();
         * // => { 'done': false, 'value': 1 }
         *
         * wrapped.next();
         * // => { 'done': false, 'value': 2 }
         *
         * wrapped.next();
         * // => { 'done': true, 'value': undefined }
         */
        function wrapperNext() {
          if (this.__values__ === undefined) {
            this.__values__ = toArray(this.value());
          }
          var done = this.__index__ >= this.__values__.length,
              value = done ? undefined : this.__values__[this.__index__++];

          return { 'done': done, 'value': value };
        }

        /**
         * Enables the wrapper to be iterable.
         *
         * @name Symbol.iterator
         * @memberOf _
         * @since 4.0.0
         * @category Seq
         * @returns {Object} Returns the wrapper object.
         * @example
         *
         * var wrapped = _([1, 2]);
         *
         * wrapped[Symbol.iterator]() === wrapped;
         * // => true
         *
         * Array.from(wrapped);
         * // => [1, 2]
         */
        function wrapperToIterator() {
          return this;
        }

        /**
         * Creates a clone of the chain sequence planting `value` as the wrapped value.
         *
         * @name plant
         * @memberOf _
         * @since 3.2.0
         * @category Seq
         * @param {*} value The value to plant.
         * @returns {Object} Returns the new `lodash` wrapper instance.
         * @example
         *
         * function square(n) {
         *   return n * n;
         * }
         *
         * var wrapped = _([1, 2]).map(square);
         * var other = wrapped.plant([3, 4]);
         *
         * other.value();
         * // => [9, 16]
         *
         * wrapped.value();
         * // => [1, 4]
         */
        function wrapperPlant(value) {
          var result,
              parent = this;

          while (parent instanceof baseLodash) {
            var clone = wrapperClone(parent);
            clone.__index__ = 0;
            clone.__values__ = undefined;
            if (result) {
              previous.__wrapped__ = clone;
            } else {
              result = clone;
            }
            var previous = clone;
            parent = parent.__wrapped__;
          }
          previous.__wrapped__ = value;
          return result;
        }

        /**
         * This method is the wrapper version of `_.reverse`.
         *
         * **Note:** This method mutates the wrapped array.
         *
         * @name reverse
         * @memberOf _
         * @since 0.1.0
         * @category Seq
         * @returns {Object} Returns the new `lodash` wrapper instance.
         * @example
         *
         * var array = [1, 2, 3];
         *
         * _(array).reverse().value()
         * // => [3, 2, 1]
         *
         * console.log(array);
         * // => [3, 2, 1]
         */
        function wrapperReverse() {
          var value = this.__wrapped__;
          if (value instanceof LazyWrapper) {
            var wrapped = value;
            if (this.__actions__.length) {
              wrapped = new LazyWrapper(this);
            }
            wrapped = wrapped.reverse();
            wrapped.__actions__.push({
              'func': thru,
              'args': [reverse],
              'thisArg': undefined
            });
            return new LodashWrapper(wrapped, this.__chain__);
          }
          return this.thru(reverse);
        }

        /**
         * Executes the chain sequence to resolve the unwrapped value.
         *
         * @name value
         * @memberOf _
         * @since 0.1.0
         * @alias toJSON, valueOf
         * @category Seq
         * @returns {*} Returns the resolved unwrapped value.
         * @example
         *
         * _([1, 2, 3]).value();
         * // => [1, 2, 3]
         */
        function wrapperValue() {
          return baseWrapperValue(this.__wrapped__, this.__actions__);
        }

        /*------------------------------------------------------------------------*/

        /**
         * Creates an object composed of keys generated from the results of running
         * each element of `collection` thru `iteratee`. The corresponding value of
         * each key is the number of times the key was returned by `iteratee`. The
         * iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 0.5.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
         * @returns {Object} Returns the composed aggregate object.
         * @example
         *
         * _.countBy([6.1, 4.2, 6.3], Math.floor);
         * // => { '4': 1, '6': 2 }
         *
         * // The `_.property` iteratee shorthand.
         * _.countBy(['one', 'two', 'three'], 'length');
         * // => { '3': 2, '5': 1 }
         */
        var countBy = createAggregator(function(result, value, key) {
          if (hasOwnProperty.call(result, key)) {
            ++result[key];
          } else {
            baseAssignValue(result, key, 1);
          }
        });

        /**
         * Checks if `predicate` returns truthy for **all** elements of `collection`.
         * Iteration is stopped once `predicate` returns falsey. The predicate is
         * invoked with three arguments: (value, index|key, collection).
         *
         * **Note:** This method returns `true` for
         * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
         * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
         * elements of empty collections.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {boolean} Returns `true` if all elements pass the predicate check,
         *  else `false`.
         * @example
         *
         * _.every([true, 1, null, 'yes'], Boolean);
         * // => false
         *
         * var users = [
         *   { 'user': 'barney', 'age': 36, 'active': false },
         *   { 'user': 'fred',   'age': 40, 'active': false }
         * ];
         *
         * // The `_.matches` iteratee shorthand.
         * _.every(users, { 'user': 'barney', 'active': false });
         * // => false
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.every(users, ['active', false]);
         * // => true
         *
         * // The `_.property` iteratee shorthand.
         * _.every(users, 'active');
         * // => false
         */
        function every(collection, predicate, guard) {
          var func = isArray(collection) ? arrayEvery : baseEvery;
          if (guard && isIterateeCall(collection, predicate, guard)) {
            predicate = undefined;
          }
          return func(collection, getIteratee(predicate, 3));
        }

        /**
         * Iterates over elements of `collection`, returning an array of all elements
         * `predicate` returns truthy for. The predicate is invoked with three
         * arguments: (value, index|key, collection).
         *
         * **Note:** Unlike `_.remove`, this method returns a new array.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the new filtered array.
         * @see _.reject
         * @example
         *
         * var users = [
         *   { 'user': 'barney', 'age': 36, 'active': true },
         *   { 'user': 'fred',   'age': 40, 'active': false }
         * ];
         *
         * _.filter(users, function(o) { return !o.active; });
         * // => objects for ['fred']
         *
         * // The `_.matches` iteratee shorthand.
         * _.filter(users, { 'age': 36, 'active': true });
         * // => objects for ['barney']
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.filter(users, ['active', false]);
         * // => objects for ['fred']
         *
         * // The `_.property` iteratee shorthand.
         * _.filter(users, 'active');
         * // => objects for ['barney']
         */
        function filter(collection, predicate) {
          var func = isArray(collection) ? arrayFilter : baseFilter;
          return func(collection, getIteratee(predicate, 3));
        }

        /**
         * Iterates over elements of `collection`, returning the first element
         * `predicate` returns truthy for. The predicate is invoked with three
         * arguments: (value, index|key, collection).
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to inspect.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @param {number} [fromIndex=0] The index to search from.
         * @returns {*} Returns the matched element, else `undefined`.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'age': 36, 'active': true },
         *   { 'user': 'fred',    'age': 40, 'active': false },
         *   { 'user': 'pebbles', 'age': 1,  'active': true }
         * ];
         *
         * _.find(users, function(o) { return o.age < 40; });
         * // => object for 'barney'
         *
         * // The `_.matches` iteratee shorthand.
         * _.find(users, { 'age': 1, 'active': true });
         * // => object for 'pebbles'
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.find(users, ['active', false]);
         * // => object for 'fred'
         *
         * // The `_.property` iteratee shorthand.
         * _.find(users, 'active');
         * // => object for 'barney'
         */
        var find = createFind(findIndex);

        /**
         * This method is like `_.find` except that it iterates over elements of
         * `collection` from right to left.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Collection
         * @param {Array|Object} collection The collection to inspect.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @param {number} [fromIndex=collection.length-1] The index to search from.
         * @returns {*} Returns the matched element, else `undefined`.
         * @example
         *
         * _.findLast([1, 2, 3, 4], function(n) {
         *   return n % 2 == 1;
         * });
         * // => 3
         */
        var findLast = createFind(findLastIndex);

        /**
         * Creates a flattened array of values by running each element in `collection`
         * thru `iteratee` and flattening the mapped results. The iteratee is invoked
         * with three arguments: (value, index|key, collection).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the new flattened array.
         * @example
         *
         * function duplicate(n) {
         *   return [n, n];
         * }
         *
         * _.flatMap([1, 2], duplicate);
         * // => [1, 1, 2, 2]
         */
        function flatMap(collection, iteratee) {
          return baseFlatten(map(collection, iteratee), 1);
        }

        /**
         * This method is like `_.flatMap` except that it recursively flattens the
         * mapped results.
         *
         * @static
         * @memberOf _
         * @since 4.7.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the new flattened array.
         * @example
         *
         * function duplicate(n) {
         *   return [[[n, n]]];
         * }
         *
         * _.flatMapDeep([1, 2], duplicate);
         * // => [1, 1, 2, 2]
         */
        function flatMapDeep(collection, iteratee) {
          return baseFlatten(map(collection, iteratee), INFINITY);
        }

        /**
         * This method is like `_.flatMap` except that it recursively flattens the
         * mapped results up to `depth` times.
         *
         * @static
         * @memberOf _
         * @since 4.7.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @param {number} [depth=1] The maximum recursion depth.
         * @returns {Array} Returns the new flattened array.
         * @example
         *
         * function duplicate(n) {
         *   return [[[n, n]]];
         * }
         *
         * _.flatMapDepth([1, 2], duplicate, 2);
         * // => [[1, 1], [2, 2]]
         */
        function flatMapDepth(collection, iteratee, depth) {
          depth = depth === undefined ? 1 : toInteger(depth);
          return baseFlatten(map(collection, iteratee), depth);
        }

        /**
         * Iterates over elements of `collection` and invokes `iteratee` for each element.
         * The iteratee is invoked with three arguments: (value, index|key, collection).
         * Iteratee functions may exit iteration early by explicitly returning `false`.
         *
         * **Note:** As with other "Collections" methods, objects with a "length"
         * property are iterated like arrays. To avoid this behavior use `_.forIn`
         * or `_.forOwn` for object iteration.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @alias each
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Array|Object} Returns `collection`.
         * @see _.forEachRight
         * @example
         *
         * _.forEach([1, 2], function(value) {
         *   console.log(value);
         * });
         * // => Logs `1` then `2`.
         *
         * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
         *   console.log(key);
         * });
         * // => Logs 'a' then 'b' (iteration order is not guaranteed).
         */
        function forEach(collection, iteratee) {
          var func = isArray(collection) ? arrayEach : baseEach;
          return func(collection, getIteratee(iteratee, 3));
        }

        /**
         * This method is like `_.forEach` except that it iterates over elements of
         * `collection` from right to left.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @alias eachRight
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Array|Object} Returns `collection`.
         * @see _.forEach
         * @example
         *
         * _.forEachRight([1, 2], function(value) {
         *   console.log(value);
         * });
         * // => Logs `2` then `1`.
         */
        function forEachRight(collection, iteratee) {
          var func = isArray(collection) ? arrayEachRight : baseEachRight;
          return func(collection, getIteratee(iteratee, 3));
        }

        /**
         * Creates an object composed of keys generated from the results of running
         * each element of `collection` thru `iteratee`. The order of grouped values
         * is determined by the order they occur in `collection`. The corresponding
         * value of each key is an array of elements responsible for generating the
         * key. The iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
         * @returns {Object} Returns the composed aggregate object.
         * @example
         *
         * _.groupBy([6.1, 4.2, 6.3], Math.floor);
         * // => { '4': [4.2], '6': [6.1, 6.3] }
         *
         * // The `_.property` iteratee shorthand.
         * _.groupBy(['one', 'two', 'three'], 'length');
         * // => { '3': ['one', 'two'], '5': ['three'] }
         */
        var groupBy = createAggregator(function(result, value, key) {
          if (hasOwnProperty.call(result, key)) {
            result[key].push(value);
          } else {
            baseAssignValue(result, key, [value]);
          }
        });

        /**
         * Checks if `value` is in `collection`. If `collection` is a string, it's
         * checked for a substring of `value`, otherwise
         * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * is used for equality comparisons. If `fromIndex` is negative, it's used as
         * the offset from the end of `collection`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object|string} collection The collection to inspect.
         * @param {*} value The value to search for.
         * @param {number} [fromIndex=0] The index to search from.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
         * @returns {boolean} Returns `true` if `value` is found, else `false`.
         * @example
         *
         * _.includes([1, 2, 3], 1);
         * // => true
         *
         * _.includes([1, 2, 3], 1, 2);
         * // => false
         *
         * _.includes({ 'a': 1, 'b': 2 }, 1);
         * // => true
         *
         * _.includes('abcd', 'bc');
         * // => true
         */
        function includes(collection, value, fromIndex, guard) {
          collection = isArrayLike(collection) ? collection : values(collection);
          fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;

          var length = collection.length;
          if (fromIndex < 0) {
            fromIndex = nativeMax(length + fromIndex, 0);
          }
          return isString(collection)
            ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
            : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
        }

        /**
         * Invokes the method at `path` of each element in `collection`, returning
         * an array of the results of each invoked method. Any additional arguments
         * are provided to each invoked method. If `path` is a function, it's invoked
         * for, and `this` bound to, each element in `collection`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Array|Function|string} path The path of the method to invoke or
         *  the function invoked per iteration.
         * @param {...*} [args] The arguments to invoke each method with.
         * @returns {Array} Returns the array of results.
         * @example
         *
         * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
         * // => [[1, 5, 7], [1, 2, 3]]
         *
         * _.invokeMap([123, 456], String.prototype.split, '');
         * // => [['1', '2', '3'], ['4', '5', '6']]
         */
        var invokeMap = baseRest(function(collection, path, args) {
          var index = -1,
              isFunc = typeof path == 'function',
              result = isArrayLike(collection) ? Array(collection.length) : [];

          baseEach(collection, function(value) {
            result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
          });
          return result;
        });

        /**
         * Creates an object composed of keys generated from the results of running
         * each element of `collection` thru `iteratee`. The corresponding value of
         * each key is the last element responsible for generating the key. The
         * iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
         * @returns {Object} Returns the composed aggregate object.
         * @example
         *
         * var array = [
         *   { 'dir': 'left', 'code': 97 },
         *   { 'dir': 'right', 'code': 100 }
         * ];
         *
         * _.keyBy(array, function(o) {
         *   return String.fromCharCode(o.code);
         * });
         * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
         *
         * _.keyBy(array, 'dir');
         * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
         */
        var keyBy = createAggregator(function(result, value, key) {
          baseAssignValue(result, key, value);
        });

        /**
         * Creates an array of values by running each element in `collection` thru
         * `iteratee`. The iteratee is invoked with three arguments:
         * (value, index|key, collection).
         *
         * Many lodash methods are guarded to work as iteratees for methods like
         * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
         *
         * The guarded methods are:
         * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
         * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
         * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
         * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the new mapped array.
         * @example
         *
         * function square(n) {
         *   return n * n;
         * }
         *
         * _.map([4, 8], square);
         * // => [16, 64]
         *
         * _.map({ 'a': 4, 'b': 8 }, square);
         * // => [16, 64] (iteration order is not guaranteed)
         *
         * var users = [
         *   { 'user': 'barney' },
         *   { 'user': 'fred' }
         * ];
         *
         * // The `_.property` iteratee shorthand.
         * _.map(users, 'user');
         * // => ['barney', 'fred']
         */
        function map(collection, iteratee) {
          var func = isArray(collection) ? arrayMap : baseMap;
          return func(collection, getIteratee(iteratee, 3));
        }

        /**
         * This method is like `_.sortBy` except that it allows specifying the sort
         * orders of the iteratees to sort by. If `orders` is unspecified, all values
         * are sorted in ascending order. Otherwise, specify an order of "desc" for
         * descending or "asc" for ascending sort order of corresponding values.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
         *  The iteratees to sort by.
         * @param {string[]} [orders] The sort orders of `iteratees`.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
         * @returns {Array} Returns the new sorted array.
         * @example
         *
         * var users = [
         *   { 'user': 'fred',   'age': 48 },
         *   { 'user': 'barney', 'age': 34 },
         *   { 'user': 'fred',   'age': 40 },
         *   { 'user': 'barney', 'age': 36 }
         * ];
         *
         * // Sort by `user` in ascending order and by `age` in descending order.
         * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
         * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
         */
        function orderBy(collection, iteratees, orders, guard) {
          if (collection == null) {
            return [];
          }
          if (!isArray(iteratees)) {
            iteratees = iteratees == null ? [] : [iteratees];
          }
          orders = guard ? undefined : orders;
          if (!isArray(orders)) {
            orders = orders == null ? [] : [orders];
          }
          return baseOrderBy(collection, iteratees, orders);
        }

        /**
         * Creates an array of elements split into two groups, the first of which
         * contains elements `predicate` returns truthy for, the second of which
         * contains elements `predicate` returns falsey for. The predicate is
         * invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the array of grouped elements.
         * @example
         *
         * var users = [
         *   { 'user': 'barney',  'age': 36, 'active': false },
         *   { 'user': 'fred',    'age': 40, 'active': true },
         *   { 'user': 'pebbles', 'age': 1,  'active': false }
         * ];
         *
         * _.partition(users, function(o) { return o.active; });
         * // => objects for [['fred'], ['barney', 'pebbles']]
         *
         * // The `_.matches` iteratee shorthand.
         * _.partition(users, { 'age': 1, 'active': false });
         * // => objects for [['pebbles'], ['barney', 'fred']]
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.partition(users, ['active', false]);
         * // => objects for [['barney', 'pebbles'], ['fred']]
         *
         * // The `_.property` iteratee shorthand.
         * _.partition(users, 'active');
         * // => objects for [['fred'], ['barney', 'pebbles']]
         */
        var partition = createAggregator(function(result, value, key) {
          result[key ? 0 : 1].push(value);
        }, function() { return [[], []]; });

        /**
         * Reduces `collection` to a value which is the accumulated result of running
         * each element in `collection` thru `iteratee`, where each successive
         * invocation is supplied the return value of the previous. If `accumulator`
         * is not given, the first element of `collection` is used as the initial
         * value. The iteratee is invoked with four arguments:
         * (accumulator, value, index|key, collection).
         *
         * Many lodash methods are guarded to work as iteratees for methods like
         * `_.reduce`, `_.reduceRight`, and `_.transform`.
         *
         * The guarded methods are:
         * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
         * and `sortBy`
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @param {*} [accumulator] The initial value.
         * @returns {*} Returns the accumulated value.
         * @see _.reduceRight
         * @example
         *
         * _.reduce([1, 2], function(sum, n) {
         *   return sum + n;
         * }, 0);
         * // => 3
         *
         * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
         *   (result[value] || (result[value] = [])).push(key);
         *   return result;
         * }, {});
         * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
         */
        function reduce(collection, iteratee, accumulator) {
          var func = isArray(collection) ? arrayReduce : baseReduce,
              initAccum = arguments.length < 3;

          return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
        }

        /**
         * This method is like `_.reduce` except that it iterates over elements of
         * `collection` from right to left.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @param {*} [accumulator] The initial value.
         * @returns {*} Returns the accumulated value.
         * @see _.reduce
         * @example
         *
         * var array = [[0, 1], [2, 3], [4, 5]];
         *
         * _.reduceRight(array, function(flattened, other) {
         *   return flattened.concat(other);
         * }, []);
         * // => [4, 5, 2, 3, 0, 1]
         */
        function reduceRight(collection, iteratee, accumulator) {
          var func = isArray(collection) ? arrayReduceRight : baseReduce,
              initAccum = arguments.length < 3;

          return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
        }

        /**
         * The opposite of `_.filter`; this method returns the elements of `collection`
         * that `predicate` does **not** return truthy for.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the new filtered array.
         * @see _.filter
         * @example
         *
         * var users = [
         *   { 'user': 'barney', 'age': 36, 'active': false },
         *   { 'user': 'fred',   'age': 40, 'active': true }
         * ];
         *
         * _.reject(users, function(o) { return !o.active; });
         * // => objects for ['fred']
         *
         * // The `_.matches` iteratee shorthand.
         * _.reject(users, { 'age': 40, 'active': true });
         * // => objects for ['barney']
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.reject(users, ['active', false]);
         * // => objects for ['fred']
         *
         * // The `_.property` iteratee shorthand.
         * _.reject(users, 'active');
         * // => objects for ['barney']
         */
        function reject(collection, predicate) {
          var func = isArray(collection) ? arrayFilter : baseFilter;
          return func(collection, negate(getIteratee(predicate, 3)));
        }

        /**
         * Gets a random element from `collection`.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Collection
         * @param {Array|Object} collection The collection to sample.
         * @returns {*} Returns the random element.
         * @example
         *
         * _.sample([1, 2, 3, 4]);
         * // => 2
         */
        function sample(collection) {
          var func = isArray(collection) ? arraySample : baseSample;
          return func(collection);
        }

        /**
         * Gets `n` random elements at unique keys from `collection` up to the
         * size of `collection`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Collection
         * @param {Array|Object} collection The collection to sample.
         * @param {number} [n=1] The number of elements to sample.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Array} Returns the random elements.
         * @example
         *
         * _.sampleSize([1, 2, 3], 2);
         * // => [3, 1]
         *
         * _.sampleSize([1, 2, 3], 4);
         * // => [2, 3, 1]
         */
        function sampleSize(collection, n, guard) {
          if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
            n = 1;
          } else {
            n = toInteger(n);
          }
          var func = isArray(collection) ? arraySampleSize : baseSampleSize;
          return func(collection, n);
        }

        /**
         * Creates an array of shuffled values, using a version of the
         * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to shuffle.
         * @returns {Array} Returns the new shuffled array.
         * @example
         *
         * _.shuffle([1, 2, 3, 4]);
         * // => [4, 1, 3, 2]
         */
        function shuffle(collection) {
          var func = isArray(collection) ? arrayShuffle : baseShuffle;
          return func(collection);
        }

        /**
         * Gets the size of `collection` by returning its length for array-like
         * values or the number of own enumerable string keyed properties for objects.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object|string} collection The collection to inspect.
         * @returns {number} Returns the collection size.
         * @example
         *
         * _.size([1, 2, 3]);
         * // => 3
         *
         * _.size({ 'a': 1, 'b': 2 });
         * // => 2
         *
         * _.size('pebbles');
         * // => 7
         */
        function size(collection) {
          if (collection == null) {
            return 0;
          }
          if (isArrayLike(collection)) {
            return isString(collection) ? stringSize(collection) : collection.length;
          }
          var tag = getTag(collection);
          if (tag == mapTag || tag == setTag) {
            return collection.size;
          }
          return baseKeys(collection).length;
        }

        /**
         * Checks if `predicate` returns truthy for **any** element of `collection`.
         * Iteration is stopped once `predicate` returns truthy. The predicate is
         * invoked with three arguments: (value, index|key, collection).
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {boolean} Returns `true` if any element passes the predicate check,
         *  else `false`.
         * @example
         *
         * _.some([null, 0, 'yes', false], Boolean);
         * // => true
         *
         * var users = [
         *   { 'user': 'barney', 'active': true },
         *   { 'user': 'fred',   'active': false }
         * ];
         *
         * // The `_.matches` iteratee shorthand.
         * _.some(users, { 'user': 'barney', 'active': false });
         * // => false
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.some(users, ['active', false]);
         * // => true
         *
         * // The `_.property` iteratee shorthand.
         * _.some(users, 'active');
         * // => true
         */
        function some(collection, predicate, guard) {
          var func = isArray(collection) ? arraySome : baseSome;
          if (guard && isIterateeCall(collection, predicate, guard)) {
            predicate = undefined;
          }
          return func(collection, getIteratee(predicate, 3));
        }

        /**
         * Creates an array of elements, sorted in ascending order by the results of
         * running each element in a collection thru each iteratee. This method
         * performs a stable sort, that is, it preserves the original sort order of
         * equal elements. The iteratees are invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Collection
         * @param {Array|Object} collection The collection to iterate over.
         * @param {...(Function|Function[])} [iteratees=[_.identity]]
         *  The iteratees to sort by.
         * @returns {Array} Returns the new sorted array.
         * @example
         *
         * var users = [
         *   { 'user': 'fred',   'age': 48 },
         *   { 'user': 'barney', 'age': 36 },
         *   { 'user': 'fred',   'age': 40 },
         *   { 'user': 'barney', 'age': 34 }
         * ];
         *
         * _.sortBy(users, [function(o) { return o.user; }]);
         * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
         *
         * _.sortBy(users, ['user', 'age']);
         * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
         */
        var sortBy = baseRest(function(collection, iteratees) {
          if (collection == null) {
            return [];
          }
          var length = iteratees.length;
          if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
            iteratees = [];
          } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
            iteratees = [iteratees[0]];
          }
          return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
        });

        /*------------------------------------------------------------------------*/

        /**
         * Gets the timestamp of the number of milliseconds that have elapsed since
         * the Unix epoch (1 January 1970 00:00:00 UTC).
         *
         * @static
         * @memberOf _
         * @since 2.4.0
         * @category Date
         * @returns {number} Returns the timestamp.
         * @example
         *
         * _.defer(function(stamp) {
         *   console.log(_.now() - stamp);
         * }, _.now());
         * // => Logs the number of milliseconds it took for the deferred invocation.
         */
        var now = ctxNow || function() {
          return root.Date.now();
        };

        /*------------------------------------------------------------------------*/

        /**
         * The opposite of `_.before`; this method creates a function that invokes
         * `func` once it's called `n` or more times.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {number} n The number of calls before `func` is invoked.
         * @param {Function} func The function to restrict.
         * @returns {Function} Returns the new restricted function.
         * @example
         *
         * var saves = ['profile', 'settings'];
         *
         * var done = _.after(saves.length, function() {
         *   console.log('done saving!');
         * });
         *
         * _.forEach(saves, function(type) {
         *   asyncSave({ 'type': type, 'complete': done });
         * });
         * // => Logs 'done saving!' after the two async saves have completed.
         */
        function after(n, func) {
          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          n = toInteger(n);
          return function() {
            if (--n < 1) {
              return func.apply(this, arguments);
            }
          };
        }

        /**
         * Creates a function that invokes `func`, with up to `n` arguments,
         * ignoring any additional arguments.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Function
         * @param {Function} func The function to cap arguments for.
         * @param {number} [n=func.length] The arity cap.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Function} Returns the new capped function.
         * @example
         *
         * _.map(['6', '8', '10'], _.ary(parseInt, 1));
         * // => [6, 8, 10]
         */
        function ary(func, n, guard) {
          n = guard ? undefined : n;
          n = (func && n == null) ? func.length : n;
          return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
        }

        /**
         * Creates a function that invokes `func`, with the `this` binding and arguments
         * of the created function, while it's called less than `n` times. Subsequent
         * calls to the created function return the result of the last `func` invocation.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Function
         * @param {number} n The number of calls at which `func` is no longer invoked.
         * @param {Function} func The function to restrict.
         * @returns {Function} Returns the new restricted function.
         * @example
         *
         * jQuery(element).on('click', _.before(5, addContactToList));
         * // => Allows adding up to 4 contacts to the list.
         */
        function before(n, func) {
          var result;
          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          n = toInteger(n);
          return function() {
            if (--n > 0) {
              result = func.apply(this, arguments);
            }
            if (n <= 1) {
              func = undefined;
            }
            return result;
          };
        }

        /**
         * Creates a function that invokes `func` with the `this` binding of `thisArg`
         * and `partials` prepended to the arguments it receives.
         *
         * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
         * may be used as a placeholder for partially applied arguments.
         *
         * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
         * property of bound functions.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {Function} func The function to bind.
         * @param {*} thisArg The `this` binding of `func`.
         * @param {...*} [partials] The arguments to be partially applied.
         * @returns {Function} Returns the new bound function.
         * @example
         *
         * function greet(greeting, punctuation) {
         *   return greeting + ' ' + this.user + punctuation;
         * }
         *
         * var object = { 'user': 'fred' };
         *
         * var bound = _.bind(greet, object, 'hi');
         * bound('!');
         * // => 'hi fred!'
         *
         * // Bound with placeholders.
         * var bound = _.bind(greet, object, _, '!');
         * bound('hi');
         * // => 'hi fred!'
         */
        var bind = baseRest(function(func, thisArg, partials) {
          var bitmask = WRAP_BIND_FLAG;
          if (partials.length) {
            var holders = replaceHolders(partials, getHolder(bind));
            bitmask |= WRAP_PARTIAL_FLAG;
          }
          return createWrap(func, bitmask, thisArg, partials, holders);
        });

        /**
         * Creates a function that invokes the method at `object[key]` with `partials`
         * prepended to the arguments it receives.
         *
         * This method differs from `_.bind` by allowing bound functions to reference
         * methods that may be redefined or don't yet exist. See
         * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
         * for more details.
         *
         * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
         * builds, may be used as a placeholder for partially applied arguments.
         *
         * @static
         * @memberOf _
         * @since 0.10.0
         * @category Function
         * @param {Object} object The object to invoke the method on.
         * @param {string} key The key of the method.
         * @param {...*} [partials] The arguments to be partially applied.
         * @returns {Function} Returns the new bound function.
         * @example
         *
         * var object = {
         *   'user': 'fred',
         *   'greet': function(greeting, punctuation) {
         *     return greeting + ' ' + this.user + punctuation;
         *   }
         * };
         *
         * var bound = _.bindKey(object, 'greet', 'hi');
         * bound('!');
         * // => 'hi fred!'
         *
         * object.greet = function(greeting, punctuation) {
         *   return greeting + 'ya ' + this.user + punctuation;
         * };
         *
         * bound('!');
         * // => 'hiya fred!'
         *
         * // Bound with placeholders.
         * var bound = _.bindKey(object, 'greet', _, '!');
         * bound('hi');
         * // => 'hiya fred!'
         */
        var bindKey = baseRest(function(object, key, partials) {
          var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
          if (partials.length) {
            var holders = replaceHolders(partials, getHolder(bindKey));
            bitmask |= WRAP_PARTIAL_FLAG;
          }
          return createWrap(key, bitmask, object, partials, holders);
        });

        /**
         * Creates a function that accepts arguments of `func` and either invokes
         * `func` returning its result, if at least `arity` number of arguments have
         * been provided, or returns a function that accepts the remaining `func`
         * arguments, and so on. The arity of `func` may be specified if `func.length`
         * is not sufficient.
         *
         * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
         * may be used as a placeholder for provided arguments.
         *
         * **Note:** This method doesn't set the "length" property of curried functions.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Function
         * @param {Function} func The function to curry.
         * @param {number} [arity=func.length] The arity of `func`.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Function} Returns the new curried function.
         * @example
         *
         * var abc = function(a, b, c) {
         *   return [a, b, c];
         * };
         *
         * var curried = _.curry(abc);
         *
         * curried(1)(2)(3);
         * // => [1, 2, 3]
         *
         * curried(1, 2)(3);
         * // => [1, 2, 3]
         *
         * curried(1, 2, 3);
         * // => [1, 2, 3]
         *
         * // Curried with placeholders.
         * curried(1)(_, 3)(2);
         * // => [1, 2, 3]
         */
        function curry(func, arity, guard) {
          arity = guard ? undefined : arity;
          var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
          result.placeholder = curry.placeholder;
          return result;
        }

        /**
         * This method is like `_.curry` except that arguments are applied to `func`
         * in the manner of `_.partialRight` instead of `_.partial`.
         *
         * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
         * builds, may be used as a placeholder for provided arguments.
         *
         * **Note:** This method doesn't set the "length" property of curried functions.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Function
         * @param {Function} func The function to curry.
         * @param {number} [arity=func.length] The arity of `func`.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Function} Returns the new curried function.
         * @example
         *
         * var abc = function(a, b, c) {
         *   return [a, b, c];
         * };
         *
         * var curried = _.curryRight(abc);
         *
         * curried(3)(2)(1);
         * // => [1, 2, 3]
         *
         * curried(2, 3)(1);
         * // => [1, 2, 3]
         *
         * curried(1, 2, 3);
         * // => [1, 2, 3]
         *
         * // Curried with placeholders.
         * curried(3)(1, _)(2);
         * // => [1, 2, 3]
         */
        function curryRight(func, arity, guard) {
          arity = guard ? undefined : arity;
          var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
          result.placeholder = curryRight.placeholder;
          return result;
        }

        /**
         * Creates a debounced function that delays invoking `func` until after `wait`
         * milliseconds have elapsed since the last time the debounced function was
         * invoked. The debounced function comes with a `cancel` method to cancel
         * delayed `func` invocations and a `flush` method to immediately invoke them.
         * Provide `options` to indicate whether `func` should be invoked on the
         * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
         * with the last arguments provided to the debounced function. Subsequent
         * calls to the debounced function return the result of the last `func`
         * invocation.
         *
         * **Note:** If `leading` and `trailing` options are `true`, `func` is
         * invoked on the trailing edge of the timeout only if the debounced function
         * is invoked more than once during the `wait` timeout.
         *
         * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
         * until to the next tick, similar to `setTimeout` with a timeout of `0`.
         *
         * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
         * for details over the differences between `_.debounce` and `_.throttle`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {Function} func The function to debounce.
         * @param {number} [wait=0] The number of milliseconds to delay.
         * @param {Object} [options={}] The options object.
         * @param {boolean} [options.leading=false]
         *  Specify invoking on the leading edge of the timeout.
         * @param {number} [options.maxWait]
         *  The maximum time `func` is allowed to be delayed before it's invoked.
         * @param {boolean} [options.trailing=true]
         *  Specify invoking on the trailing edge of the timeout.
         * @returns {Function} Returns the new debounced function.
         * @example
         *
         * // Avoid costly calculations while the window size is in flux.
         * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
         *
         * // Invoke `sendMail` when clicked, debouncing subsequent calls.
         * jQuery(element).on('click', _.debounce(sendMail, 300, {
         *   'leading': true,
         *   'trailing': false
         * }));
         *
         * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
         * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
         * var source = new EventSource('/stream');
         * jQuery(source).on('message', debounced);
         *
         * // Cancel the trailing debounced invocation.
         * jQuery(window).on('popstate', debounced.cancel);
         */
        function debounce(func, wait, options) {
          var lastArgs,
              lastThis,
              maxWait,
              result,
              timerId,
              lastCallTime,
              lastInvokeTime = 0,
              leading = false,
              maxing = false,
              trailing = true;

          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          wait = toNumber(wait) || 0;
          if (isObject(options)) {
            leading = !!options.leading;
            maxing = 'maxWait' in options;
            maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
            trailing = 'trailing' in options ? !!options.trailing : trailing;
          }

          function invokeFunc(time) {
            var args = lastArgs,
                thisArg = lastThis;

            lastArgs = lastThis = undefined;
            lastInvokeTime = time;
            result = func.apply(thisArg, args);
            return result;
          }

          function leadingEdge(time) {
            // Reset any `maxWait` timer.
            lastInvokeTime = time;
            // Start the timer for the trailing edge.
            timerId = setTimeout(timerExpired, wait);
            // Invoke the leading edge.
            return leading ? invokeFunc(time) : result;
          }

          function remainingWait(time) {
            var timeSinceLastCall = time - lastCallTime,
                timeSinceLastInvoke = time - lastInvokeTime,
                result = wait - timeSinceLastCall;

            return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;
          }

          function shouldInvoke(time) {
            var timeSinceLastCall = time - lastCallTime,
                timeSinceLastInvoke = time - lastInvokeTime;

            // Either this is the first call, activity has stopped and we're at the
            // trailing edge, the system time has gone backwards and we're treating
            // it as the trailing edge, or we've hit the `maxWait` limit.
            return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
              (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
          }

          function timerExpired() {
            var time = now();
            if (shouldInvoke(time)) {
              return trailingEdge(time);
            }
            // Restart the timer.
            timerId = setTimeout(timerExpired, remainingWait(time));
          }

          function trailingEdge(time) {
            timerId = undefined;

            // Only invoke if we have `lastArgs` which means `func` has been
            // debounced at least once.
            if (trailing && lastArgs) {
              return invokeFunc(time);
            }
            lastArgs = lastThis = undefined;
            return result;
          }

          function cancel() {
            if (timerId !== undefined) {
              clearTimeout(timerId);
            }
            lastInvokeTime = 0;
            lastArgs = lastCallTime = lastThis = timerId = undefined;
          }

          function flush() {
            return timerId === undefined ? result : trailingEdge(now());
          }

          function debounced() {
            var time = now(),
                isInvoking = shouldInvoke(time);

            lastArgs = arguments;
            lastThis = this;
            lastCallTime = time;

            if (isInvoking) {
              if (timerId === undefined) {
                return leadingEdge(lastCallTime);
              }
              if (maxing) {
                // Handle invocations in a tight loop.
                timerId = setTimeout(timerExpired, wait);
                return invokeFunc(lastCallTime);
              }
            }
            if (timerId === undefined) {
              timerId = setTimeout(timerExpired, wait);
            }
            return result;
          }
          debounced.cancel = cancel;
          debounced.flush = flush;
          return debounced;
        }

        /**
         * Defers invoking the `func` until the current call stack has cleared. Any
         * additional arguments are provided to `func` when it's invoked.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {Function} func The function to defer.
         * @param {...*} [args] The arguments to invoke `func` with.
         * @returns {number} Returns the timer id.
         * @example
         *
         * _.defer(function(text) {
         *   console.log(text);
         * }, 'deferred');
         * // => Logs 'deferred' after one millisecond.
         */
        var defer = baseRest(function(func, args) {
          return baseDelay(func, 1, args);
        });

        /**
         * Invokes `func` after `wait` milliseconds. Any additional arguments are
         * provided to `func` when it's invoked.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {Function} func The function to delay.
         * @param {number} wait The number of milliseconds to delay invocation.
         * @param {...*} [args] The arguments to invoke `func` with.
         * @returns {number} Returns the timer id.
         * @example
         *
         * _.delay(function(text) {
         *   console.log(text);
         * }, 1000, 'later');
         * // => Logs 'later' after one second.
         */
        var delay = baseRest(function(func, wait, args) {
          return baseDelay(func, toNumber(wait) || 0, args);
        });

        /**
         * Creates a function that invokes `func` with arguments reversed.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Function
         * @param {Function} func The function to flip arguments for.
         * @returns {Function} Returns the new flipped function.
         * @example
         *
         * var flipped = _.flip(function() {
         *   return _.toArray(arguments);
         * });
         *
         * flipped('a', 'b', 'c', 'd');
         * // => ['d', 'c', 'b', 'a']
         */
        function flip(func) {
          return createWrap(func, WRAP_FLIP_FLAG);
        }

        /**
         * Creates a function that memoizes the result of `func`. If `resolver` is
         * provided, it determines the cache key for storing the result based on the
         * arguments provided to the memoized function. By default, the first argument
         * provided to the memoized function is used as the map cache key. The `func`
         * is invoked with the `this` binding of the memoized function.
         *
         * **Note:** The cache is exposed as the `cache` property on the memoized
         * function. Its creation may be customized by replacing the `_.memoize.Cache`
         * constructor with one whose instances implement the
         * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
         * method interface of `clear`, `delete`, `get`, `has`, and `set`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {Function} func The function to have its output memoized.
         * @param {Function} [resolver] The function to resolve the cache key.
         * @returns {Function} Returns the new memoized function.
         * @example
         *
         * var object = { 'a': 1, 'b': 2 };
         * var other = { 'c': 3, 'd': 4 };
         *
         * var values = _.memoize(_.values);
         * values(object);
         * // => [1, 2]
         *
         * values(other);
         * // => [3, 4]
         *
         * object.a = 2;
         * values(object);
         * // => [1, 2]
         *
         * // Modify the result cache.
         * values.cache.set(object, ['a', 'b']);
         * values(object);
         * // => ['a', 'b']
         *
         * // Replace `_.memoize.Cache`.
         * _.memoize.Cache = WeakMap;
         */
        function memoize(func, resolver) {
          if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          var memoized = function() {
            var args = arguments,
                key = resolver ? resolver.apply(this, args) : args[0],
                cache = memoized.cache;

            if (cache.has(key)) {
              return cache.get(key);
            }
            var result = func.apply(this, args);
            memoized.cache = cache.set(key, result) || cache;
            return result;
          };
          memoized.cache = new (memoize.Cache || MapCache);
          return memoized;
        }

        // Expose `MapCache`.
        memoize.Cache = MapCache;

        /**
         * Creates a function that negates the result of the predicate `func`. The
         * `func` predicate is invoked with the `this` binding and arguments of the
         * created function.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Function
         * @param {Function} predicate The predicate to negate.
         * @returns {Function} Returns the new negated function.
         * @example
         *
         * function isEven(n) {
         *   return n % 2 == 0;
         * }
         *
         * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
         * // => [1, 3, 5]
         */
        function negate(predicate) {
          if (typeof predicate != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          return function() {
            var args = arguments;
            switch (args.length) {
              case 0: return !predicate.call(this);
              case 1: return !predicate.call(this, args[0]);
              case 2: return !predicate.call(this, args[0], args[1]);
              case 3: return !predicate.call(this, args[0], args[1], args[2]);
            }
            return !predicate.apply(this, args);
          };
        }

        /**
         * Creates a function that is restricted to invoking `func` once. Repeat calls
         * to the function return the value of the first invocation. The `func` is
         * invoked with the `this` binding and arguments of the created function.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {Function} func The function to restrict.
         * @returns {Function} Returns the new restricted function.
         * @example
         *
         * var initialize = _.once(createApplication);
         * initialize();
         * initialize();
         * // => `createApplication` is invoked once
         */
        function once(func) {
          return before(2, func);
        }

        /**
         * Creates a function that invokes `func` with its arguments transformed.
         *
         * @static
         * @since 4.0.0
         * @memberOf _
         * @category Function
         * @param {Function} func The function to wrap.
         * @param {...(Function|Function[])} [transforms=[_.identity]]
         *  The argument transforms.
         * @returns {Function} Returns the new function.
         * @example
         *
         * function doubled(n) {
         *   return n * 2;
         * }
         *
         * function square(n) {
         *   return n * n;
         * }
         *
         * var func = _.overArgs(function(x, y) {
         *   return [x, y];
         * }, [square, doubled]);
         *
         * func(9, 3);
         * // => [81, 6]
         *
         * func(10, 5);
         * // => [100, 10]
         */
        var overArgs = castRest(function(func, transforms) {
          transforms = (transforms.length == 1 && isArray(transforms[0]))
            ? arrayMap(transforms[0], baseUnary(getIteratee()))
            : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));

          var funcsLength = transforms.length;
          return baseRest(function(args) {
            var index = -1,
                length = nativeMin(args.length, funcsLength);

            while (++index < length) {
              args[index] = transforms[index].call(this, args[index]);
            }
            return apply(func, this, args);
          });
        });

        /**
         * Creates a function that invokes `func` with `partials` prepended to the
         * arguments it receives. This method is like `_.bind` except it does **not**
         * alter the `this` binding.
         *
         * The `_.partial.placeholder` value, which defaults to `_` in monolithic
         * builds, may be used as a placeholder for partially applied arguments.
         *
         * **Note:** This method doesn't set the "length" property of partially
         * applied functions.
         *
         * @static
         * @memberOf _
         * @since 0.2.0
         * @category Function
         * @param {Function} func The function to partially apply arguments to.
         * @param {...*} [partials] The arguments to be partially applied.
         * @returns {Function} Returns the new partially applied function.
         * @example
         *
         * function greet(greeting, name) {
         *   return greeting + ' ' + name;
         * }
         *
         * var sayHelloTo = _.partial(greet, 'hello');
         * sayHelloTo('fred');
         * // => 'hello fred'
         *
         * // Partially applied with placeholders.
         * var greetFred = _.partial(greet, _, 'fred');
         * greetFred('hi');
         * // => 'hi fred'
         */
        var partial = baseRest(function(func, partials) {
          var holders = replaceHolders(partials, getHolder(partial));
          return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
        });

        /**
         * This method is like `_.partial` except that partially applied arguments
         * are appended to the arguments it receives.
         *
         * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
         * builds, may be used as a placeholder for partially applied arguments.
         *
         * **Note:** This method doesn't set the "length" property of partially
         * applied functions.
         *
         * @static
         * @memberOf _
         * @since 1.0.0
         * @category Function
         * @param {Function} func The function to partially apply arguments to.
         * @param {...*} [partials] The arguments to be partially applied.
         * @returns {Function} Returns the new partially applied function.
         * @example
         *
         * function greet(greeting, name) {
         *   return greeting + ' ' + name;
         * }
         *
         * var greetFred = _.partialRight(greet, 'fred');
         * greetFred('hi');
         * // => 'hi fred'
         *
         * // Partially applied with placeholders.
         * var sayHelloTo = _.partialRight(greet, 'hello', _);
         * sayHelloTo('fred');
         * // => 'hello fred'
         */
        var partialRight = baseRest(function(func, partials) {
          var holders = replaceHolders(partials, getHolder(partialRight));
          return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
        });

        /**
         * Creates a function that invokes `func` with arguments arranged according
         * to the specified `indexes` where the argument value at the first index is
         * provided as the first argument, the argument value at the second index is
         * provided as the second argument, and so on.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Function
         * @param {Function} func The function to rearrange arguments for.
         * @param {...(number|number[])} indexes The arranged argument indexes.
         * @returns {Function} Returns the new function.
         * @example
         *
         * var rearged = _.rearg(function(a, b, c) {
         *   return [a, b, c];
         * }, [2, 0, 1]);
         *
         * rearged('b', 'c', 'a')
         * // => ['a', 'b', 'c']
         */
        var rearg = flatRest(function(func, indexes) {
          return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
        });

        /**
         * Creates a function that invokes `func` with the `this` binding of the
         * created function and arguments from `start` and beyond provided as
         * an array.
         *
         * **Note:** This method is based on the
         * [rest parameter](https://mdn.io/rest_parameters).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Function
         * @param {Function} func The function to apply a rest parameter to.
         * @param {number} [start=func.length-1] The start position of the rest parameter.
         * @returns {Function} Returns the new function.
         * @example
         *
         * var say = _.rest(function(what, names) {
         *   return what + ' ' + _.initial(names).join(', ') +
         *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
         * });
         *
         * say('hello', 'fred', 'barney', 'pebbles');
         * // => 'hello fred, barney, & pebbles'
         */
        function rest(func, start) {
          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          start = start === undefined ? start : toInteger(start);
          return baseRest(func, start);
        }

        /**
         * Creates a function that invokes `func` with the `this` binding of the
         * create function and an array of arguments much like
         * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
         *
         * **Note:** This method is based on the
         * [spread operator](https://mdn.io/spread_operator).
         *
         * @static
         * @memberOf _
         * @since 3.2.0
         * @category Function
         * @param {Function} func The function to spread arguments over.
         * @param {number} [start=0] The start position of the spread.
         * @returns {Function} Returns the new function.
         * @example
         *
         * var say = _.spread(function(who, what) {
         *   return who + ' says ' + what;
         * });
         *
         * say(['fred', 'hello']);
         * // => 'fred says hello'
         *
         * var numbers = Promise.all([
         *   Promise.resolve(40),
         *   Promise.resolve(36)
         * ]);
         *
         * numbers.then(_.spread(function(x, y) {
         *   return x + y;
         * }));
         * // => a Promise of 76
         */
        function spread(func, start) {
          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          start = start == null ? 0 : nativeMax(toInteger(start), 0);
          return baseRest(function(args) {
            var array = args[start],
                otherArgs = castSlice(args, 0, start);

            if (array) {
              arrayPush(otherArgs, array);
            }
            return apply(func, this, otherArgs);
          });
        }

        /**
         * Creates a throttled function that only invokes `func` at most once per
         * every `wait` milliseconds. The throttled function comes with a `cancel`
         * method to cancel delayed `func` invocations and a `flush` method to
         * immediately invoke them. Provide `options` to indicate whether `func`
         * should be invoked on the leading and/or trailing edge of the `wait`
         * timeout. The `func` is invoked with the last arguments provided to the
         * throttled function. Subsequent calls to the throttled function return the
         * result of the last `func` invocation.
         *
         * **Note:** If `leading` and `trailing` options are `true`, `func` is
         * invoked on the trailing edge of the timeout only if the throttled function
         * is invoked more than once during the `wait` timeout.
         *
         * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
         * until to the next tick, similar to `setTimeout` with a timeout of `0`.
         *
         * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
         * for details over the differences between `_.throttle` and `_.debounce`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {Function} func The function to throttle.
         * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
         * @param {Object} [options={}] The options object.
         * @param {boolean} [options.leading=true]
         *  Specify invoking on the leading edge of the timeout.
         * @param {boolean} [options.trailing=true]
         *  Specify invoking on the trailing edge of the timeout.
         * @returns {Function} Returns the new throttled function.
         * @example
         *
         * // Avoid excessively updating the position while scrolling.
         * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
         *
         * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
         * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
         * jQuery(element).on('click', throttled);
         *
         * // Cancel the trailing throttled invocation.
         * jQuery(window).on('popstate', throttled.cancel);
         */
        function throttle(func, wait, options) {
          var leading = true,
              trailing = true;

          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          if (isObject(options)) {
            leading = 'leading' in options ? !!options.leading : leading;
            trailing = 'trailing' in options ? !!options.trailing : trailing;
          }
          return debounce(func, wait, {
            'leading': leading,
            'maxWait': wait,
            'trailing': trailing
          });
        }

        /**
         * Creates a function that accepts up to one argument, ignoring any
         * additional arguments.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Function
         * @param {Function} func The function to cap arguments for.
         * @returns {Function} Returns the new capped function.
         * @example
         *
         * _.map(['6', '8', '10'], _.unary(parseInt));
         * // => [6, 8, 10]
         */
        function unary(func) {
          return ary(func, 1);
        }

        /**
         * Creates a function that provides `value` to `wrapper` as its first
         * argument. Any additional arguments provided to the function are appended
         * to those provided to the `wrapper`. The wrapper is invoked with the `this`
         * binding of the created function.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Function
         * @param {*} value The value to wrap.
         * @param {Function} [wrapper=identity] The wrapper function.
         * @returns {Function} Returns the new function.
         * @example
         *
         * var p = _.wrap(_.escape, function(func, text) {
         *   return '<p>' + func(text) + '</p>';
         * });
         *
         * p('fred, barney, & pebbles');
         * // => '<p>fred, barney, &amp; pebbles</p>'
         */
        function wrap(value, wrapper) {
          return partial(castFunction(wrapper), value);
        }

        /*------------------------------------------------------------------------*/

        /**
         * Casts `value` as an array if it's not one.
         *
         * @static
         * @memberOf _
         * @since 4.4.0
         * @category Lang
         * @param {*} value The value to inspect.
         * @returns {Array} Returns the cast array.
         * @example
         *
         * _.castArray(1);
         * // => [1]
         *
         * _.castArray({ 'a': 1 });
         * // => [{ 'a': 1 }]
         *
         * _.castArray('abc');
         * // => ['abc']
         *
         * _.castArray(null);
         * // => [null]
         *
         * _.castArray(undefined);
         * // => [undefined]
         *
         * _.castArray();
         * // => []
         *
         * var array = [1, 2, 3];
         * console.log(_.castArray(array) === array);
         * // => true
         */
        function castArray() {
          if (!arguments.length) {
            return [];
          }
          var value = arguments[0];
          return isArray(value) ? value : [value];
        }

        /**
         * Creates a shallow clone of `value`.
         *
         * **Note:** This method is loosely based on the
         * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
         * and supports cloning arrays, array buffers, booleans, date objects, maps,
         * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
         * arrays. The own enumerable properties of `arguments` objects are cloned
         * as plain objects. An empty object is returned for uncloneable values such
         * as error objects, functions, DOM nodes, and WeakMaps.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to clone.
         * @returns {*} Returns the cloned value.
         * @see _.cloneDeep
         * @example
         *
         * var objects = [{ 'a': 1 }, { 'b': 2 }];
         *
         * var shallow = _.clone(objects);
         * console.log(shallow[0] === objects[0]);
         * // => true
         */
        function clone(value) {
          return baseClone(value, CLONE_SYMBOLS_FLAG);
        }

        /**
         * This method is like `_.clone` except that it accepts `customizer` which
         * is invoked to produce the cloned value. If `customizer` returns `undefined`,
         * cloning is handled by the method instead. The `customizer` is invoked with
         * up to four arguments; (value [, index|key, object, stack]).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to clone.
         * @param {Function} [customizer] The function to customize cloning.
         * @returns {*} Returns the cloned value.
         * @see _.cloneDeepWith
         * @example
         *
         * function customizer(value) {
         *   if (_.isElement(value)) {
         *     return value.cloneNode(false);
         *   }
         * }
         *
         * var el = _.cloneWith(document.body, customizer);
         *
         * console.log(el === document.body);
         * // => false
         * console.log(el.nodeName);
         * // => 'BODY'
         * console.log(el.childNodes.length);
         * // => 0
         */
        function cloneWith(value, customizer) {
          customizer = typeof customizer == 'function' ? customizer : undefined;
          return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
        }

        /**
         * This method is like `_.clone` except that it recursively clones `value`.
         *
         * @static
         * @memberOf _
         * @since 1.0.0
         * @category Lang
         * @param {*} value The value to recursively clone.
         * @returns {*} Returns the deep cloned value.
         * @see _.clone
         * @example
         *
         * var objects = [{ 'a': 1 }, { 'b': 2 }];
         *
         * var deep = _.cloneDeep(objects);
         * console.log(deep[0] === objects[0]);
         * // => false
         */
        function cloneDeep(value) {
          return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
        }

        /**
         * This method is like `_.cloneWith` except that it recursively clones `value`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to recursively clone.
         * @param {Function} [customizer] The function to customize cloning.
         * @returns {*} Returns the deep cloned value.
         * @see _.cloneWith
         * @example
         *
         * function customizer(value) {
         *   if (_.isElement(value)) {
         *     return value.cloneNode(true);
         *   }
         * }
         *
         * var el = _.cloneDeepWith(document.body, customizer);
         *
         * console.log(el === document.body);
         * // => false
         * console.log(el.nodeName);
         * // => 'BODY'
         * console.log(el.childNodes.length);
         * // => 20
         */
        function cloneDeepWith(value, customizer) {
          customizer = typeof customizer == 'function' ? customizer : undefined;
          return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
        }

        /**
         * Checks if `object` conforms to `source` by invoking the predicate
         * properties of `source` with the corresponding property values of `object`.
         *
         * **Note:** This method is equivalent to `_.conforms` when `source` is
         * partially applied.
         *
         * @static
         * @memberOf _
         * @since 4.14.0
         * @category Lang
         * @param {Object} object The object to inspect.
         * @param {Object} source The object of property predicates to conform to.
         * @returns {boolean} Returns `true` if `object` conforms, else `false`.
         * @example
         *
         * var object = { 'a': 1, 'b': 2 };
         *
         * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
         * // => true
         *
         * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
         * // => false
         */
        function conformsTo(object, source) {
          return source == null || baseConformsTo(object, source, keys(source));
        }

        /**
         * Performs a
         * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
         * comparison between two values to determine if they are equivalent.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
         * @example
         *
         * var object = { 'a': 1 };
         * var other = { 'a': 1 };
         *
         * _.eq(object, object);
         * // => true
         *
         * _.eq(object, other);
         * // => false
         *
         * _.eq('a', 'a');
         * // => true
         *
         * _.eq('a', Object('a'));
         * // => false
         *
         * _.eq(NaN, NaN);
         * // => true
         */
        function eq(value, other) {
          return value === other || (value !== value && other !== other);
        }

        /**
         * Checks if `value` is greater than `other`.
         *
         * @static
         * @memberOf _
         * @since 3.9.0
         * @category Lang
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {boolean} Returns `true` if `value` is greater than `other`,
         *  else `false`.
         * @see _.lt
         * @example
         *
         * _.gt(3, 1);
         * // => true
         *
         * _.gt(3, 3);
         * // => false
         *
         * _.gt(1, 3);
         * // => false
         */
        var gt = createRelationalOperation(baseGt);

        /**
         * Checks if `value` is greater than or equal to `other`.
         *
         * @static
         * @memberOf _
         * @since 3.9.0
         * @category Lang
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {boolean} Returns `true` if `value` is greater than or equal to
         *  `other`, else `false`.
         * @see _.lte
         * @example
         *
         * _.gte(3, 1);
         * // => true
         *
         * _.gte(3, 3);
         * // => true
         *
         * _.gte(1, 3);
         * // => false
         */
        var gte = createRelationalOperation(function(value, other) {
          return value >= other;
        });

        /**
         * Checks if `value` is likely an `arguments` object.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an `arguments` object,
         *  else `false`.
         * @example
         *
         * _.isArguments(function() { return arguments; }());
         * // => true
         *
         * _.isArguments([1, 2, 3]);
         * // => false
         */
        var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
          return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
            !propertyIsEnumerable.call(value, 'callee');
        };

        /**
         * Checks if `value` is classified as an `Array` object.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an array, else `false`.
         * @example
         *
         * _.isArray([1, 2, 3]);
         * // => true
         *
         * _.isArray(document.body.children);
         * // => false
         *
         * _.isArray('abc');
         * // => false
         *
         * _.isArray(_.noop);
         * // => false
         */
        var isArray = Array.isArray;

        /**
         * Checks if `value` is classified as an `ArrayBuffer` object.
         *
         * @static
         * @memberOf _
         * @since 4.3.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
         * @example
         *
         * _.isArrayBuffer(new ArrayBuffer(2));
         * // => true
         *
         * _.isArrayBuffer(new Array(2));
         * // => false
         */
        var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;

        /**
         * Checks if `value` is array-like. A value is considered array-like if it's
         * not a function and has a `value.length` that's an integer greater than or
         * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
         * @example
         *
         * _.isArrayLike([1, 2, 3]);
         * // => true
         *
         * _.isArrayLike(document.body.children);
         * // => true
         *
         * _.isArrayLike('abc');
         * // => true
         *
         * _.isArrayLike(_.noop);
         * // => false
         */
        function isArrayLike(value) {
          return value != null && isLength(value.length) && !isFunction(value);
        }

        /**
         * This method is like `_.isArrayLike` except that it also checks if `value`
         * is an object.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an array-like object,
         *  else `false`.
         * @example
         *
         * _.isArrayLikeObject([1, 2, 3]);
         * // => true
         *
         * _.isArrayLikeObject(document.body.children);
         * // => true
         *
         * _.isArrayLikeObject('abc');
         * // => false
         *
         * _.isArrayLikeObject(_.noop);
         * // => false
         */
        function isArrayLikeObject(value) {
          return isObjectLike(value) && isArrayLike(value);
        }

        /**
         * Checks if `value` is classified as a boolean primitive or object.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
         * @example
         *
         * _.isBoolean(false);
         * // => true
         *
         * _.isBoolean(null);
         * // => false
         */
        function isBoolean(value) {
          return value === true || value === false ||
            (isObjectLike(value) && baseGetTag(value) == boolTag);
        }

        /**
         * Checks if `value` is a buffer.
         *
         * @static
         * @memberOf _
         * @since 4.3.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
         * @example
         *
         * _.isBuffer(new Buffer(2));
         * // => true
         *
         * _.isBuffer(new Uint8Array(2));
         * // => false
         */
        var isBuffer = nativeIsBuffer || stubFalse;

        /**
         * Checks if `value` is classified as a `Date` object.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
         * @example
         *
         * _.isDate(new Date);
         * // => true
         *
         * _.isDate('Mon April 23 2012');
         * // => false
         */
        var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;

        /**
         * Checks if `value` is likely a DOM element.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
         * @example
         *
         * _.isElement(document.body);
         * // => true
         *
         * _.isElement('<body>');
         * // => false
         */
        function isElement(value) {
          return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
        }

        /**
         * Checks if `value` is an empty object, collection, map, or set.
         *
         * Objects are considered empty if they have no own enumerable string keyed
         * properties.
         *
         * Array-like values such as `arguments` objects, arrays, buffers, strings, or
         * jQuery-like collections are considered empty if they have a `length` of `0`.
         * Similarly, maps and sets are considered empty if they have a `size` of `0`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is empty, else `false`.
         * @example
         *
         * _.isEmpty(null);
         * // => true
         *
         * _.isEmpty(true);
         * // => true
         *
         * _.isEmpty(1);
         * // => true
         *
         * _.isEmpty([1, 2, 3]);
         * // => false
         *
         * _.isEmpty({ 'a': 1 });
         * // => false
         */
        function isEmpty(value) {
          if (value == null) {
            return true;
          }
          if (isArrayLike(value) &&
              (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
                isBuffer(value) || isTypedArray(value) || isArguments(value))) {
            return !value.length;
          }
          var tag = getTag(value);
          if (tag == mapTag || tag == setTag) {
            return !value.size;
          }
          if (isPrototype(value)) {
            return !baseKeys(value).length;
          }
          for (var key in value) {
            if (hasOwnProperty.call(value, key)) {
              return false;
            }
          }
          return true;
        }

        /**
         * Performs a deep comparison between two values to determine if they are
         * equivalent.
         *
         * **Note:** This method supports comparing arrays, array buffers, booleans,
         * date objects, error objects, maps, numbers, `Object` objects, regexes,
         * sets, strings, symbols, and typed arrays. `Object` objects are compared
         * by their own, not inherited, enumerable properties. Functions and DOM
         * nodes are compared by strict equality, i.e. `===`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
         * @example
         *
         * var object = { 'a': 1 };
         * var other = { 'a': 1 };
         *
         * _.isEqual(object, other);
         * // => true
         *
         * object === other;
         * // => false
         */
        function isEqual(value, other) {
          return baseIsEqual(value, other);
        }

        /**
         * This method is like `_.isEqual` except that it accepts `customizer` which
         * is invoked to compare values. If `customizer` returns `undefined`, comparisons
         * are handled by the method instead. The `customizer` is invoked with up to
         * six arguments: (objValue, othValue [, index|key, object, other, stack]).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @param {Function} [customizer] The function to customize comparisons.
         * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
         * @example
         *
         * function isGreeting(value) {
         *   return /^h(?:i|ello)$/.test(value);
         * }
         *
         * function customizer(objValue, othValue) {
         *   if (isGreeting(objValue) && isGreeting(othValue)) {
         *     return true;
         *   }
         * }
         *
         * var array = ['hello', 'goodbye'];
         * var other = ['hi', 'goodbye'];
         *
         * _.isEqualWith(array, other, customizer);
         * // => true
         */
        function isEqualWith(value, other, customizer) {
          customizer = typeof customizer == 'function' ? customizer : undefined;
          var result = customizer ? customizer(value, other) : undefined;
          return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
        }

        /**
         * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
         * `SyntaxError`, `TypeError`, or `URIError` object.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
         * @example
         *
         * _.isError(new Error);
         * // => true
         *
         * _.isError(Error);
         * // => false
         */
        function isError(value) {
          if (!isObjectLike(value)) {
            return false;
          }
          var tag = baseGetTag(value);
          return tag == errorTag || tag == domExcTag ||
            (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
        }

        /**
         * Checks if `value` is a finite primitive number.
         *
         * **Note:** This method is based on
         * [`Number.isFinite`](https://mdn.io/Number/isFinite).
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
         * @example
         *
         * _.isFinite(3);
         * // => true
         *
         * _.isFinite(Number.MIN_VALUE);
         * // => true
         *
         * _.isFinite(Infinity);
         * // => false
         *
         * _.isFinite('3');
         * // => false
         */
        function isFinite(value) {
          return typeof value == 'number' && nativeIsFinite(value);
        }

        /**
         * Checks if `value` is classified as a `Function` object.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a function, else `false`.
         * @example
         *
         * _.isFunction(_);
         * // => true
         *
         * _.isFunction(/abc/);
         * // => false
         */
        function isFunction(value) {
          if (!isObject(value)) {
            return false;
          }
          // The use of `Object#toString` avoids issues with the `typeof` operator
          // in Safari 9 which returns 'object' for typed arrays and other constructors.
          var tag = baseGetTag(value);
          return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
        }

        /**
         * Checks if `value` is an integer.
         *
         * **Note:** This method is based on
         * [`Number.isInteger`](https://mdn.io/Number/isInteger).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
         * @example
         *
         * _.isInteger(3);
         * // => true
         *
         * _.isInteger(Number.MIN_VALUE);
         * // => false
         *
         * _.isInteger(Infinity);
         * // => false
         *
         * _.isInteger('3');
         * // => false
         */
        function isInteger(value) {
          return typeof value == 'number' && value == toInteger(value);
        }

        /**
         * Checks if `value` is a valid array-like length.
         *
         * **Note:** This method is loosely based on
         * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
         * @example
         *
         * _.isLength(3);
         * // => true
         *
         * _.isLength(Number.MIN_VALUE);
         * // => false
         *
         * _.isLength(Infinity);
         * // => false
         *
         * _.isLength('3');
         * // => false
         */
        function isLength(value) {
          return typeof value == 'number' &&
            value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
        }

        /**
         * Checks if `value` is the
         * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
         * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is an object, else `false`.
         * @example
         *
         * _.isObject({});
         * // => true
         *
         * _.isObject([1, 2, 3]);
         * // => true
         *
         * _.isObject(_.noop);
         * // => true
         *
         * _.isObject(null);
         * // => false
         */
        function isObject(value) {
          var type = typeof value;
          return value != null && (type == 'object' || type == 'function');
        }

        /**
         * Checks if `value` is object-like. A value is object-like if it's not `null`
         * and has a `typeof` result of "object".
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
         * @example
         *
         * _.isObjectLike({});
         * // => true
         *
         * _.isObjectLike([1, 2, 3]);
         * // => true
         *
         * _.isObjectLike(_.noop);
         * // => false
         *
         * _.isObjectLike(null);
         * // => false
         */
        function isObjectLike(value) {
          return value != null && typeof value == 'object';
        }

        /**
         * Checks if `value` is classified as a `Map` object.
         *
         * @static
         * @memberOf _
         * @since 4.3.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a map, else `false`.
         * @example
         *
         * _.isMap(new Map);
         * // => true
         *
         * _.isMap(new WeakMap);
         * // => false
         */
        var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;

        /**
         * Performs a partial deep comparison between `object` and `source` to
         * determine if `object` contains equivalent property values.
         *
         * **Note:** This method is equivalent to `_.matches` when `source` is
         * partially applied.
         *
         * Partial comparisons will match empty array and empty object `source`
         * values against any array or object value, respectively. See `_.isEqual`
         * for a list of supported value comparisons.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Lang
         * @param {Object} object The object to inspect.
         * @param {Object} source The object of property values to match.
         * @returns {boolean} Returns `true` if `object` is a match, else `false`.
         * @example
         *
         * var object = { 'a': 1, 'b': 2 };
         *
         * _.isMatch(object, { 'b': 2 });
         * // => true
         *
         * _.isMatch(object, { 'b': 1 });
         * // => false
         */
        function isMatch(object, source) {
          return object === source || baseIsMatch(object, source, getMatchData(source));
        }

        /**
         * This method is like `_.isMatch` except that it accepts `customizer` which
         * is invoked to compare values. If `customizer` returns `undefined`, comparisons
         * are handled by the method instead. The `customizer` is invoked with five
         * arguments: (objValue, srcValue, index|key, object, source).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {Object} object The object to inspect.
         * @param {Object} source The object of property values to match.
         * @param {Function} [customizer] The function to customize comparisons.
         * @returns {boolean} Returns `true` if `object` is a match, else `false`.
         * @example
         *
         * function isGreeting(value) {
         *   return /^h(?:i|ello)$/.test(value);
         * }
         *
         * function customizer(objValue, srcValue) {
         *   if (isGreeting(objValue) && isGreeting(srcValue)) {
         *     return true;
         *   }
         * }
         *
         * var object = { 'greeting': 'hello' };
         * var source = { 'greeting': 'hi' };
         *
         * _.isMatchWith(object, source, customizer);
         * // => true
         */
        function isMatchWith(object, source, customizer) {
          customizer = typeof customizer == 'function' ? customizer : undefined;
          return baseIsMatch(object, source, getMatchData(source), customizer);
        }

        /**
         * Checks if `value` is `NaN`.
         *
         * **Note:** This method is based on
         * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
         * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
         * `undefined` and other non-number values.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
         * @example
         *
         * _.isNaN(NaN);
         * // => true
         *
         * _.isNaN(new Number(NaN));
         * // => true
         *
         * isNaN(undefined);
         * // => true
         *
         * _.isNaN(undefined);
         * // => false
         */
        function isNaN(value) {
          // An `NaN` primitive is the only value that is not equal to itself.
          // Perform the `toStringTag` check first to avoid errors with some
          // ActiveX objects in IE.
          return isNumber(value) && value != +value;
        }

        /**
         * Checks if `value` is a pristine native function.
         *
         * **Note:** This method can't reliably detect native functions in the presence
         * of the core-js package because core-js circumvents this kind of detection.
         * Despite multiple requests, the core-js maintainer has made it clear: any
         * attempt to fix the detection will be obstructed. As a result, we're left
         * with little choice but to throw an error. Unfortunately, this also affects
         * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
         * which rely on core-js.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a native function,
         *  else `false`.
         * @example
         *
         * _.isNative(Array.prototype.push);
         * // => true
         *
         * _.isNative(_);
         * // => false
         */
        function isNative(value) {
          if (isMaskable(value)) {
            throw new Error(CORE_ERROR_TEXT);
          }
          return baseIsNative(value);
        }

        /**
         * Checks if `value` is `null`.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
         * @example
         *
         * _.isNull(null);
         * // => true
         *
         * _.isNull(void 0);
         * // => false
         */
        function isNull(value) {
          return value === null;
        }

        /**
         * Checks if `value` is `null` or `undefined`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
         * @example
         *
         * _.isNil(null);
         * // => true
         *
         * _.isNil(void 0);
         * // => true
         *
         * _.isNil(NaN);
         * // => false
         */
        function isNil(value) {
          return value == null;
        }

        /**
         * Checks if `value` is classified as a `Number` primitive or object.
         *
         * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
         * classified as numbers, use the `_.isFinite` method.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a number, else `false`.
         * @example
         *
         * _.isNumber(3);
         * // => true
         *
         * _.isNumber(Number.MIN_VALUE);
         * // => true
         *
         * _.isNumber(Infinity);
         * // => true
         *
         * _.isNumber('3');
         * // => false
         */
        function isNumber(value) {
          return typeof value == 'number' ||
            (isObjectLike(value) && baseGetTag(value) == numberTag);
        }

        /**
         * Checks if `value` is a plain object, that is, an object created by the
         * `Object` constructor or one with a `[[Prototype]]` of `null`.
         *
         * @static
         * @memberOf _
         * @since 0.8.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         * }
         *
         * _.isPlainObject(new Foo);
         * // => false
         *
         * _.isPlainObject([1, 2, 3]);
         * // => false
         *
         * _.isPlainObject({ 'x': 0, 'y': 0 });
         * // => true
         *
         * _.isPlainObject(Object.create(null));
         * // => true
         */
        function isPlainObject(value) {
          if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
            return false;
          }
          var proto = getPrototype(value);
          if (proto === null) {
            return true;
          }
          var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
          return typeof Ctor == 'function' && Ctor instanceof Ctor &&
            funcToString.call(Ctor) == objectCtorString;
        }

        /**
         * Checks if `value` is classified as a `RegExp` object.
         *
         * @static
         * @memberOf _
         * @since 0.1.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
         * @example
         *
         * _.isRegExp(/abc/);
         * // => true
         *
         * _.isRegExp('/abc/');
         * // => false
         */
        var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;

        /**
         * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
         * double precision number which isn't the result of a rounded unsafe integer.
         *
         * **Note:** This method is based on
         * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
         * @example
         *
         * _.isSafeInteger(3);
         * // => true
         *
         * _.isSafeInteger(Number.MIN_VALUE);
         * // => false
         *
         * _.isSafeInteger(Infinity);
         * // => false
         *
         * _.isSafeInteger('3');
         * // => false
         */
        function isSafeInteger(value) {
          return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
        }

        /**
         * Checks if `value` is classified as a `Set` object.
         *
         * @static
         * @memberOf _
         * @since 4.3.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a set, else `false`.
         * @example
         *
         * _.isSet(new Set);
         * // => true
         *
         * _.isSet(new WeakSet);
         * // => false
         */
        var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;

        /**
         * Checks if `value` is classified as a `String` primitive or object.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a string, else `false`.
         * @example
         *
         * _.isString('abc');
         * // => true
         *
         * _.isString(1);
         * // => false
         */
        function isString(value) {
          return typeof value == 'string' ||
            (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
        }

        /**
         * Checks if `value` is classified as a `Symbol` primitive or object.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
         * @example
         *
         * _.isSymbol(Symbol.iterator);
         * // => true
         *
         * _.isSymbol('abc');
         * // => false
         */
        function isSymbol(value) {
          return typeof value == 'symbol' ||
            (isObjectLike(value) && baseGetTag(value) == symbolTag);
        }

        /**
         * Checks if `value` is classified as a typed array.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
         * @example
         *
         * _.isTypedArray(new Uint8Array);
         * // => true
         *
         * _.isTypedArray([]);
         * // => false
         */
        var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;

        /**
         * Checks if `value` is `undefined`.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
         * @example
         *
         * _.isUndefined(void 0);
         * // => true
         *
         * _.isUndefined(null);
         * // => false
         */
        function isUndefined(value) {
          return value === undefined;
        }

        /**
         * Checks if `value` is classified as a `WeakMap` object.
         *
         * @static
         * @memberOf _
         * @since 4.3.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
         * @example
         *
         * _.isWeakMap(new WeakMap);
         * // => true
         *
         * _.isWeakMap(new Map);
         * // => false
         */
        function isWeakMap(value) {
          return isObjectLike(value) && getTag(value) == weakMapTag;
        }

        /**
         * Checks if `value` is classified as a `WeakSet` object.
         *
         * @static
         * @memberOf _
         * @since 4.3.0
         * @category Lang
         * @param {*} value The value to check.
         * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
         * @example
         *
         * _.isWeakSet(new WeakSet);
         * // => true
         *
         * _.isWeakSet(new Set);
         * // => false
         */
        function isWeakSet(value) {
          return isObjectLike(value) && baseGetTag(value) == weakSetTag;
        }

        /**
         * Checks if `value` is less than `other`.
         *
         * @static
         * @memberOf _
         * @since 3.9.0
         * @category Lang
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {boolean} Returns `true` if `value` is less than `other`,
         *  else `false`.
         * @see _.gt
         * @example
         *
         * _.lt(1, 3);
         * // => true
         *
         * _.lt(3, 3);
         * // => false
         *
         * _.lt(3, 1);
         * // => false
         */
        var lt = createRelationalOperation(baseLt);

        /**
         * Checks if `value` is less than or equal to `other`.
         *
         * @static
         * @memberOf _
         * @since 3.9.0
         * @category Lang
         * @param {*} value The value to compare.
         * @param {*} other The other value to compare.
         * @returns {boolean} Returns `true` if `value` is less than or equal to
         *  `other`, else `false`.
         * @see _.gte
         * @example
         *
         * _.lte(1, 3);
         * // => true
         *
         * _.lte(3, 3);
         * // => true
         *
         * _.lte(3, 1);
         * // => false
         */
        var lte = createRelationalOperation(function(value, other) {
          return value <= other;
        });

        /**
         * Converts `value` to an array.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Lang
         * @param {*} value The value to convert.
         * @returns {Array} Returns the converted array.
         * @example
         *
         * _.toArray({ 'a': 1, 'b': 2 });
         * // => [1, 2]
         *
         * _.toArray('abc');
         * // => ['a', 'b', 'c']
         *
         * _.toArray(1);
         * // => []
         *
         * _.toArray(null);
         * // => []
         */
        function toArray(value) {
          if (!value) {
            return [];
          }
          if (isArrayLike(value)) {
            return isString(value) ? stringToArray(value) : copyArray(value);
          }
          if (symIterator && value[symIterator]) {
            return iteratorToArray(value[symIterator]());
          }
          var tag = getTag(value),
              func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);

          return func(value);
        }

        /**
         * Converts `value` to a finite number.
         *
         * @static
         * @memberOf _
         * @since 4.12.0
         * @category Lang
         * @param {*} value The value to convert.
         * @returns {number} Returns the converted number.
         * @example
         *
         * _.toFinite(3.2);
         * // => 3.2
         *
         * _.toFinite(Number.MIN_VALUE);
         * // => 5e-324
         *
         * _.toFinite(Infinity);
         * // => 1.7976931348623157e+308
         *
         * _.toFinite('3.2');
         * // => 3.2
         */
        function toFinite(value) {
          if (!value) {
            return value === 0 ? value : 0;
          }
          value = toNumber(value);
          if (value === INFINITY || value === -INFINITY) {
            var sign = (value < 0 ? -1 : 1);
            return sign * MAX_INTEGER;
          }
          return value === value ? value : 0;
        }

        /**
         * Converts `value` to an integer.
         *
         * **Note:** This method is loosely based on
         * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to convert.
         * @returns {number} Returns the converted integer.
         * @example
         *
         * _.toInteger(3.2);
         * // => 3
         *
         * _.toInteger(Number.MIN_VALUE);
         * // => 0
         *
         * _.toInteger(Infinity);
         * // => 1.7976931348623157e+308
         *
         * _.toInteger('3.2');
         * // => 3
         */
        function toInteger(value) {
          var result = toFinite(value),
              remainder = result % 1;

          return result === result ? (remainder ? result - remainder : result) : 0;
        }

        /**
         * Converts `value` to an integer suitable for use as the length of an
         * array-like object.
         *
         * **Note:** This method is based on
         * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to convert.
         * @returns {number} Returns the converted integer.
         * @example
         *
         * _.toLength(3.2);
         * // => 3
         *
         * _.toLength(Number.MIN_VALUE);
         * // => 0
         *
         * _.toLength(Infinity);
         * // => 4294967295
         *
         * _.toLength('3.2');
         * // => 3
         */
        function toLength(value) {
          return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
        }

        /**
         * Converts `value` to a number.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to process.
         * @returns {number} Returns the number.
         * @example
         *
         * _.toNumber(3.2);
         * // => 3.2
         *
         * _.toNumber(Number.MIN_VALUE);
         * // => 5e-324
         *
         * _.toNumber(Infinity);
         * // => Infinity
         *
         * _.toNumber('3.2');
         * // => 3.2
         */
        function toNumber(value) {
          if (typeof value == 'number') {
            return value;
          }
          if (isSymbol(value)) {
            return NAN;
          }
          if (isObject(value)) {
            var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
            value = isObject(other) ? (other + '') : other;
          }
          if (typeof value != 'string') {
            return value === 0 ? value : +value;
          }
          value = value.replace(reTrim, '');
          var isBinary = reIsBinary.test(value);
          return (isBinary || reIsOctal.test(value))
            ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
            : (reIsBadHex.test(value) ? NAN : +value);
        }

        /**
         * Converts `value` to a plain object flattening inherited enumerable string
         * keyed properties of `value` to own properties of the plain object.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Lang
         * @param {*} value The value to convert.
         * @returns {Object} Returns the converted plain object.
         * @example
         *
         * function Foo() {
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.assign({ 'a': 1 }, new Foo);
         * // => { 'a': 1, 'b': 2 }
         *
         * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
         * // => { 'a': 1, 'b': 2, 'c': 3 }
         */
        function toPlainObject(value) {
          return copyObject(value, keysIn(value));
        }

        /**
         * Converts `value` to a safe integer. A safe integer can be compared and
         * represented correctly.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to convert.
         * @returns {number} Returns the converted integer.
         * @example
         *
         * _.toSafeInteger(3.2);
         * // => 3
         *
         * _.toSafeInteger(Number.MIN_VALUE);
         * // => 0
         *
         * _.toSafeInteger(Infinity);
         * // => 9007199254740991
         *
         * _.toSafeInteger('3.2');
         * // => 3
         */
        function toSafeInteger(value) {
          return value
            ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
            : (value === 0 ? value : 0);
        }

        /**
         * Converts `value` to a string. An empty string is returned for `null`
         * and `undefined` values. The sign of `-0` is preserved.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Lang
         * @param {*} value The value to convert.
         * @returns {string} Returns the converted string.
         * @example
         *
         * _.toString(null);
         * // => ''
         *
         * _.toString(-0);
         * // => '-0'
         *
         * _.toString([1, 2, 3]);
         * // => '1,2,3'
         */
        function toString(value) {
          return value == null ? '' : baseToString(value);
        }

        /*------------------------------------------------------------------------*/

        /**
         * Assigns own enumerable string keyed properties of source objects to the
         * destination object. Source objects are applied from left to right.
         * Subsequent sources overwrite property assignments of previous sources.
         *
         * **Note:** This method mutates `object` and is loosely based on
         * [`Object.assign`](https://mdn.io/Object/assign).
         *
         * @static
         * @memberOf _
         * @since 0.10.0
         * @category Object
         * @param {Object} object The destination object.
         * @param {...Object} [sources] The source objects.
         * @returns {Object} Returns `object`.
         * @see _.assignIn
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         * }
         *
         * function Bar() {
         *   this.c = 3;
         * }
         *
         * Foo.prototype.b = 2;
         * Bar.prototype.d = 4;
         *
         * _.assign({ 'a': 0 }, new Foo, new Bar);
         * // => { 'a': 1, 'c': 3 }
         */
        var assign = createAssigner(function(object, source) {
          if (isPrototype(source) || isArrayLike(source)) {
            copyObject(source, keys(source), object);
            return;
          }
          for (var key in source) {
            if (hasOwnProperty.call(source, key)) {
              assignValue(object, key, source[key]);
            }
          }
        });

        /**
         * This method is like `_.assign` except that it iterates over own and
         * inherited source properties.
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @alias extend
         * @category Object
         * @param {Object} object The destination object.
         * @param {...Object} [sources] The source objects.
         * @returns {Object} Returns `object`.
         * @see _.assign
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         * }
         *
         * function Bar() {
         *   this.c = 3;
         * }
         *
         * Foo.prototype.b = 2;
         * Bar.prototype.d = 4;
         *
         * _.assignIn({ 'a': 0 }, new Foo, new Bar);
         * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
         */
        var assignIn = createAssigner(function(object, source) {
          copyObject(source, keysIn(source), object);
        });

        /**
         * This method is like `_.assignIn` except that it accepts `customizer`
         * which is invoked to produce the assigned values. If `customizer` returns
         * `undefined`, assignment is handled by the method instead. The `customizer`
         * is invoked with five arguments: (objValue, srcValue, key, object, source).
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @alias extendWith
         * @category Object
         * @param {Object} object The destination object.
         * @param {...Object} sources The source objects.
         * @param {Function} [customizer] The function to customize assigned values.
         * @returns {Object} Returns `object`.
         * @see _.assignWith
         * @example
         *
         * function customizer(objValue, srcValue) {
         *   return _.isUndefined(objValue) ? srcValue : objValue;
         * }
         *
         * var defaults = _.partialRight(_.assignInWith, customizer);
         *
         * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
         * // => { 'a': 1, 'b': 2 }
         */
        var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
          copyObject(source, keysIn(source), object, customizer);
        });

        /**
         * This method is like `_.assign` except that it accepts `customizer`
         * which is invoked to produce the assigned values. If `customizer` returns
         * `undefined`, assignment is handled by the method instead. The `customizer`
         * is invoked with five arguments: (objValue, srcValue, key, object, source).
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The destination object.
         * @param {...Object} sources The source objects.
         * @param {Function} [customizer] The function to customize assigned values.
         * @returns {Object} Returns `object`.
         * @see _.assignInWith
         * @example
         *
         * function customizer(objValue, srcValue) {
         *   return _.isUndefined(objValue) ? srcValue : objValue;
         * }
         *
         * var defaults = _.partialRight(_.assignWith, customizer);
         *
         * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
         * // => { 'a': 1, 'b': 2 }
         */
        var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
          copyObject(source, keys(source), object, customizer);
        });

        /**
         * Creates an array of values corresponding to `paths` of `object`.
         *
         * @static
         * @memberOf _
         * @since 1.0.0
         * @category Object
         * @param {Object} object The object to iterate over.
         * @param {...(string|string[])} [paths] The property paths to pick.
         * @returns {Array} Returns the picked values.
         * @example
         *
         * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
         *
         * _.at(object, ['a[0].b.c', 'a[1]']);
         * // => [3, 4]
         */
        var at = flatRest(baseAt);

        /**
         * Creates an object that inherits from the `prototype` object. If a
         * `properties` object is given, its own enumerable string keyed properties
         * are assigned to the created object.
         *
         * @static
         * @memberOf _
         * @since 2.3.0
         * @category Object
         * @param {Object} prototype The object to inherit from.
         * @param {Object} [properties] The properties to assign to the object.
         * @returns {Object} Returns the new object.
         * @example
         *
         * function Shape() {
         *   this.x = 0;
         *   this.y = 0;
         * }
         *
         * function Circle() {
         *   Shape.call(this);
         * }
         *
         * Circle.prototype = _.create(Shape.prototype, {
         *   'constructor': Circle
         * });
         *
         * var circle = new Circle;
         * circle instanceof Circle;
         * // => true
         *
         * circle instanceof Shape;
         * // => true
         */
        function create(prototype, properties) {
          var result = baseCreate(prototype);
          return properties == null ? result : baseAssign(result, properties);
        }

        /**
         * Assigns own and inherited enumerable string keyed properties of source
         * objects to the destination object for all destination properties that
         * resolve to `undefined`. Source objects are applied from left to right.
         * Once a property is set, additional values of the same property are ignored.
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Object
         * @param {Object} object The destination object.
         * @param {...Object} [sources] The source objects.
         * @returns {Object} Returns `object`.
         * @see _.defaultsDeep
         * @example
         *
         * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
         * // => { 'a': 1, 'b': 2 }
         */
        var defaults = baseRest(function(args) {
          args.push(undefined, customDefaultsAssignIn);
          return apply(assignInWith, undefined, args);
        });

        /**
         * This method is like `_.defaults` except that it recursively assigns
         * default properties.
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 3.10.0
         * @category Object
         * @param {Object} object The destination object.
         * @param {...Object} [sources] The source objects.
         * @returns {Object} Returns `object`.
         * @see _.defaults
         * @example
         *
         * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
         * // => { 'a': { 'b': 2, 'c': 3 } }
         */
        var defaultsDeep = baseRest(function(args) {
          args.push(undefined, customDefaultsMerge);
          return apply(mergeWith, undefined, args);
        });

        /**
         * This method is like `_.find` except that it returns the key of the first
         * element `predicate` returns truthy for instead of the element itself.
         *
         * @static
         * @memberOf _
         * @since 1.1.0
         * @category Object
         * @param {Object} object The object to inspect.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {string|undefined} Returns the key of the matched element,
         *  else `undefined`.
         * @example
         *
         * var users = {
         *   'barney':  { 'age': 36, 'active': true },
         *   'fred':    { 'age': 40, 'active': false },
         *   'pebbles': { 'age': 1,  'active': true }
         * };
         *
         * _.findKey(users, function(o) { return o.age < 40; });
         * // => 'barney' (iteration order is not guaranteed)
         *
         * // The `_.matches` iteratee shorthand.
         * _.findKey(users, { 'age': 1, 'active': true });
         * // => 'pebbles'
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.findKey(users, ['active', false]);
         * // => 'fred'
         *
         * // The `_.property` iteratee shorthand.
         * _.findKey(users, 'active');
         * // => 'barney'
         */
        function findKey(object, predicate) {
          return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
        }

        /**
         * This method is like `_.findKey` except that it iterates over elements of
         * a collection in the opposite order.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Object
         * @param {Object} object The object to inspect.
         * @param {Function} [predicate=_.identity] The function invoked per iteration.
         * @returns {string|undefined} Returns the key of the matched element,
         *  else `undefined`.
         * @example
         *
         * var users = {
         *   'barney':  { 'age': 36, 'active': true },
         *   'fred':    { 'age': 40, 'active': false },
         *   'pebbles': { 'age': 1,  'active': true }
         * };
         *
         * _.findLastKey(users, function(o) { return o.age < 40; });
         * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
         *
         * // The `_.matches` iteratee shorthand.
         * _.findLastKey(users, { 'age': 36, 'active': true });
         * // => 'barney'
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.findLastKey(users, ['active', false]);
         * // => 'fred'
         *
         * // The `_.property` iteratee shorthand.
         * _.findLastKey(users, 'active');
         * // => 'pebbles'
         */
        function findLastKey(object, predicate) {
          return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
        }

        /**
         * Iterates over own and inherited enumerable string keyed properties of an
         * object and invokes `iteratee` for each property. The iteratee is invoked
         * with three arguments: (value, key, object). Iteratee functions may exit
         * iteration early by explicitly returning `false`.
         *
         * @static
         * @memberOf _
         * @since 0.3.0
         * @category Object
         * @param {Object} object The object to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Object} Returns `object`.
         * @see _.forInRight
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.forIn(new Foo, function(value, key) {
         *   console.log(key);
         * });
         * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
         */
        function forIn(object, iteratee) {
          return object == null
            ? object
            : baseFor(object, getIteratee(iteratee, 3), keysIn);
        }

        /**
         * This method is like `_.forIn` except that it iterates over properties of
         * `object` in the opposite order.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Object
         * @param {Object} object The object to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Object} Returns `object`.
         * @see _.forIn
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.forInRight(new Foo, function(value, key) {
         *   console.log(key);
         * });
         * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
         */
        function forInRight(object, iteratee) {
          return object == null
            ? object
            : baseForRight(object, getIteratee(iteratee, 3), keysIn);
        }

        /**
         * Iterates over own enumerable string keyed properties of an object and
         * invokes `iteratee` for each property. The iteratee is invoked with three
         * arguments: (value, key, object). Iteratee functions may exit iteration
         * early by explicitly returning `false`.
         *
         * @static
         * @memberOf _
         * @since 0.3.0
         * @category Object
         * @param {Object} object The object to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Object} Returns `object`.
         * @see _.forOwnRight
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.forOwn(new Foo, function(value, key) {
         *   console.log(key);
         * });
         * // => Logs 'a' then 'b' (iteration order is not guaranteed).
         */
        function forOwn(object, iteratee) {
          return object && baseForOwn(object, getIteratee(iteratee, 3));
        }

        /**
         * This method is like `_.forOwn` except that it iterates over properties of
         * `object` in the opposite order.
         *
         * @static
         * @memberOf _
         * @since 2.0.0
         * @category Object
         * @param {Object} object The object to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Object} Returns `object`.
         * @see _.forOwn
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.forOwnRight(new Foo, function(value, key) {
         *   console.log(key);
         * });
         * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
         */
        function forOwnRight(object, iteratee) {
          return object && baseForOwnRight(object, getIteratee(iteratee, 3));
        }

        /**
         * Creates an array of function property names from own enumerable properties
         * of `object`.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Object
         * @param {Object} object The object to inspect.
         * @returns {Array} Returns the function names.
         * @see _.functionsIn
         * @example
         *
         * function Foo() {
         *   this.a = _.constant('a');
         *   this.b = _.constant('b');
         * }
         *
         * Foo.prototype.c = _.constant('c');
         *
         * _.functions(new Foo);
         * // => ['a', 'b']
         */
        function functions(object) {
          return object == null ? [] : baseFunctions(object, keys(object));
        }

        /**
         * Creates an array of function property names from own and inherited
         * enumerable properties of `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The object to inspect.
         * @returns {Array} Returns the function names.
         * @see _.functions
         * @example
         *
         * function Foo() {
         *   this.a = _.constant('a');
         *   this.b = _.constant('b');
         * }
         *
         * Foo.prototype.c = _.constant('c');
         *
         * _.functionsIn(new Foo);
         * // => ['a', 'b', 'c']
         */
        function functionsIn(object) {
          return object == null ? [] : baseFunctions(object, keysIn(object));
        }

        /**
         * Gets the value at `path` of `object`. If the resolved value is
         * `undefined`, the `defaultValue` is returned in its place.
         *
         * @static
         * @memberOf _
         * @since 3.7.0
         * @category Object
         * @param {Object} object The object to query.
         * @param {Array|string} path The path of the property to get.
         * @param {*} [defaultValue] The value returned for `undefined` resolved values.
         * @returns {*} Returns the resolved value.
         * @example
         *
         * var object = { 'a': [{ 'b': { 'c': 3 } }] };
         *
         * _.get(object, 'a[0].b.c');
         * // => 3
         *
         * _.get(object, ['a', '0', 'b', 'c']);
         * // => 3
         *
         * _.get(object, 'a.b.c', 'default');
         * // => 'default'
         */
        function get(object, path, defaultValue) {
          var result = object == null ? undefined : baseGet(object, path);
          return result === undefined ? defaultValue : result;
        }

        /**
         * Checks if `path` is a direct property of `object`.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Object
         * @param {Object} object The object to query.
         * @param {Array|string} path The path to check.
         * @returns {boolean} Returns `true` if `path` exists, else `false`.
         * @example
         *
         * var object = { 'a': { 'b': 2 } };
         * var other = _.create({ 'a': _.create({ 'b': 2 }) });
         *
         * _.has(object, 'a');
         * // => true
         *
         * _.has(object, 'a.b');
         * // => true
         *
         * _.has(object, ['a', 'b']);
         * // => true
         *
         * _.has(other, 'a');
         * // => false
         */
        function has(object, path) {
          return object != null && hasPath(object, path, baseHas);
        }

        /**
         * Checks if `path` is a direct or inherited property of `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The object to query.
         * @param {Array|string} path The path to check.
         * @returns {boolean} Returns `true` if `path` exists, else `false`.
         * @example
         *
         * var object = _.create({ 'a': _.create({ 'b': 2 }) });
         *
         * _.hasIn(object, 'a');
         * // => true
         *
         * _.hasIn(object, 'a.b');
         * // => true
         *
         * _.hasIn(object, ['a', 'b']);
         * // => true
         *
         * _.hasIn(object, 'b');
         * // => false
         */
        function hasIn(object, path) {
          return object != null && hasPath(object, path, baseHasIn);
        }

        /**
         * Creates an object composed of the inverted keys and values of `object`.
         * If `object` contains duplicate values, subsequent values overwrite
         * property assignments of previous values.
         *
         * @static
         * @memberOf _
         * @since 0.7.0
         * @category Object
         * @param {Object} object The object to invert.
         * @returns {Object} Returns the new inverted object.
         * @example
         *
         * var object = { 'a': 1, 'b': 2, 'c': 1 };
         *
         * _.invert(object);
         * // => { '1': 'c', '2': 'b' }
         */
        var invert = createInverter(function(result, value, key) {
          result[value] = key;
        }, constant(identity));

        /**
         * This method is like `_.invert` except that the inverted object is generated
         * from the results of running each element of `object` thru `iteratee`. The
         * corresponding inverted value of each inverted key is an array of keys
         * responsible for generating the inverted value. The iteratee is invoked
         * with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.1.0
         * @category Object
         * @param {Object} object The object to invert.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {Object} Returns the new inverted object.
         * @example
         *
         * var object = { 'a': 1, 'b': 2, 'c': 1 };
         *
         * _.invertBy(object);
         * // => { '1': ['a', 'c'], '2': ['b'] }
         *
         * _.invertBy(object, function(value) {
         *   return 'group' + value;
         * });
         * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
         */
        var invertBy = createInverter(function(result, value, key) {
          if (hasOwnProperty.call(result, value)) {
            result[value].push(key);
          } else {
            result[value] = [key];
          }
        }, getIteratee);

        /**
         * Invokes the method at `path` of `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The object to query.
         * @param {Array|string} path The path of the method to invoke.
         * @param {...*} [args] The arguments to invoke the method with.
         * @returns {*} Returns the result of the invoked method.
         * @example
         *
         * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
         *
         * _.invoke(object, 'a[0].b.c.slice', 1, 3);
         * // => [2, 3]
         */
        var invoke = baseRest(baseInvoke);

        /**
         * Creates an array of the own enumerable property names of `object`.
         *
         * **Note:** Non-object values are coerced to objects. See the
         * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
         * for more details.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Object
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property names.
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.keys(new Foo);
         * // => ['a', 'b'] (iteration order is not guaranteed)
         *
         * _.keys('hi');
         * // => ['0', '1']
         */
        function keys(object) {
          return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
        }

        /**
         * Creates an array of the own and inherited enumerable property names of `object`.
         *
         * **Note:** Non-object values are coerced to objects.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Object
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property names.
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.keysIn(new Foo);
         * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
         */
        function keysIn(object) {
          return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
        }

        /**
         * The opposite of `_.mapValues`; this method creates an object with the
         * same values as `object` and keys generated by running each own enumerable
         * string keyed property of `object` thru `iteratee`. The iteratee is invoked
         * with three arguments: (value, key, object).
         *
         * @static
         * @memberOf _
         * @since 3.8.0
         * @category Object
         * @param {Object} object The object to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Object} Returns the new mapped object.
         * @see _.mapValues
         * @example
         *
         * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
         *   return key + value;
         * });
         * // => { 'a1': 1, 'b2': 2 }
         */
        function mapKeys(object, iteratee) {
          var result = {};
          iteratee = getIteratee(iteratee, 3);

          baseForOwn(object, function(value, key, object) {
            baseAssignValue(result, iteratee(value, key, object), value);
          });
          return result;
        }

        /**
         * Creates an object with the same keys as `object` and values generated
         * by running each own enumerable string keyed property of `object` thru
         * `iteratee`. The iteratee is invoked with three arguments:
         * (value, key, object).
         *
         * @static
         * @memberOf _
         * @since 2.4.0
         * @category Object
         * @param {Object} object The object to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Object} Returns the new mapped object.
         * @see _.mapKeys
         * @example
         *
         * var users = {
         *   'fred':    { 'user': 'fred',    'age': 40 },
         *   'pebbles': { 'user': 'pebbles', 'age': 1 }
         * };
         *
         * _.mapValues(users, function(o) { return o.age; });
         * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
         *
         * // The `_.property` iteratee shorthand.
         * _.mapValues(users, 'age');
         * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
         */
        function mapValues(object, iteratee) {
          var result = {};
          iteratee = getIteratee(iteratee, 3);

          baseForOwn(object, function(value, key, object) {
            baseAssignValue(result, key, iteratee(value, key, object));
          });
          return result;
        }

        /**
         * This method is like `_.assign` except that it recursively merges own and
         * inherited enumerable string keyed properties of source objects into the
         * destination object. Source properties that resolve to `undefined` are
         * skipped if a destination value exists. Array and plain object properties
         * are merged recursively. Other objects and value types are overridden by
         * assignment. Source objects are applied from left to right. Subsequent
         * sources overwrite property assignments of previous sources.
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 0.5.0
         * @category Object
         * @param {Object} object The destination object.
         * @param {...Object} [sources] The source objects.
         * @returns {Object} Returns `object`.
         * @example
         *
         * var object = {
         *   'a': [{ 'b': 2 }, { 'd': 4 }]
         * };
         *
         * var other = {
         *   'a': [{ 'c': 3 }, { 'e': 5 }]
         * };
         *
         * _.merge(object, other);
         * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
         */
        var merge = createAssigner(function(object, source, srcIndex) {
          baseMerge(object, source, srcIndex);
        });

        /**
         * This method is like `_.merge` except that it accepts `customizer` which
         * is invoked to produce the merged values of the destination and source
         * properties. If `customizer` returns `undefined`, merging is handled by the
         * method instead. The `customizer` is invoked with six arguments:
         * (objValue, srcValue, key, object, source, stack).
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The destination object.
         * @param {...Object} sources The source objects.
         * @param {Function} customizer The function to customize assigned values.
         * @returns {Object} Returns `object`.
         * @example
         *
         * function customizer(objValue, srcValue) {
         *   if (_.isArray(objValue)) {
         *     return objValue.concat(srcValue);
         *   }
         * }
         *
         * var object = { 'a': [1], 'b': [2] };
         * var other = { 'a': [3], 'b': [4] };
         *
         * _.mergeWith(object, other, customizer);
         * // => { 'a': [1, 3], 'b': [2, 4] }
         */
        var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
          baseMerge(object, source, srcIndex, customizer);
        });

        /**
         * The opposite of `_.pick`; this method creates an object composed of the
         * own and inherited enumerable property paths of `object` that are not omitted.
         *
         * **Note:** This method is considerably slower than `_.pick`.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Object
         * @param {Object} object The source object.
         * @param {...(string|string[])} [paths] The property paths to omit.
         * @returns {Object} Returns the new object.
         * @example
         *
         * var object = { 'a': 1, 'b': '2', 'c': 3 };
         *
         * _.omit(object, ['a', 'c']);
         * // => { 'b': '2' }
         */
        var omit = flatRest(function(object, paths) {
          var result = {};
          if (object == null) {
            return result;
          }
          var isDeep = false;
          paths = arrayMap(paths, function(path) {
            path = castPath(path, object);
            isDeep || (isDeep = path.length > 1);
            return path;
          });
          copyObject(object, getAllKeysIn(object), result);
          if (isDeep) {
            result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
          }
          var length = paths.length;
          while (length--) {
            baseUnset(result, paths[length]);
          }
          return result;
        });

        /**
         * The opposite of `_.pickBy`; this method creates an object composed of
         * the own and inherited enumerable string keyed properties of `object` that
         * `predicate` doesn't return truthy for. The predicate is invoked with two
         * arguments: (value, key).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The source object.
         * @param {Function} [predicate=_.identity] The function invoked per property.
         * @returns {Object} Returns the new object.
         * @example
         *
         * var object = { 'a': 1, 'b': '2', 'c': 3 };
         *
         * _.omitBy(object, _.isNumber);
         * // => { 'b': '2' }
         */
        function omitBy(object, predicate) {
          return pickBy(object, negate(getIteratee(predicate)));
        }

        /**
         * Creates an object composed of the picked `object` properties.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Object
         * @param {Object} object The source object.
         * @param {...(string|string[])} [paths] The property paths to pick.
         * @returns {Object} Returns the new object.
         * @example
         *
         * var object = { 'a': 1, 'b': '2', 'c': 3 };
         *
         * _.pick(object, ['a', 'c']);
         * // => { 'a': 1, 'c': 3 }
         */
        var pick = flatRest(function(object, paths) {
          return object == null ? {} : basePick(object, paths);
        });

        /**
         * Creates an object composed of the `object` properties `predicate` returns
         * truthy for. The predicate is invoked with two arguments: (value, key).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The source object.
         * @param {Function} [predicate=_.identity] The function invoked per property.
         * @returns {Object} Returns the new object.
         * @example
         *
         * var object = { 'a': 1, 'b': '2', 'c': 3 };
         *
         * _.pickBy(object, _.isNumber);
         * // => { 'a': 1, 'c': 3 }
         */
        function pickBy(object, predicate) {
          if (object == null) {
            return {};
          }
          var props = arrayMap(getAllKeysIn(object), function(prop) {
            return [prop];
          });
          predicate = getIteratee(predicate);
          return basePickBy(object, props, function(value, path) {
            return predicate(value, path[0]);
          });
        }

        /**
         * This method is like `_.get` except that if the resolved value is a
         * function it's invoked with the `this` binding of its parent object and
         * its result is returned.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Object
         * @param {Object} object The object to query.
         * @param {Array|string} path The path of the property to resolve.
         * @param {*} [defaultValue] The value returned for `undefined` resolved values.
         * @returns {*} Returns the resolved value.
         * @example
         *
         * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
         *
         * _.result(object, 'a[0].b.c1');
         * // => 3
         *
         * _.result(object, 'a[0].b.c2');
         * // => 4
         *
         * _.result(object, 'a[0].b.c3', 'default');
         * // => 'default'
         *
         * _.result(object, 'a[0].b.c3', _.constant('default'));
         * // => 'default'
         */
        function result(object, path, defaultValue) {
          path = castPath(path, object);

          var index = -1,
              length = path.length;

          // Ensure the loop is entered when path is empty.
          if (!length) {
            length = 1;
            object = undefined;
          }
          while (++index < length) {
            var value = object == null ? undefined : object[toKey(path[index])];
            if (value === undefined) {
              index = length;
              value = defaultValue;
            }
            object = isFunction(value) ? value.call(object) : value;
          }
          return object;
        }

        /**
         * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
         * it's created. Arrays are created for missing index properties while objects
         * are created for all other missing properties. Use `_.setWith` to customize
         * `path` creation.
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 3.7.0
         * @category Object
         * @param {Object} object The object to modify.
         * @param {Array|string} path The path of the property to set.
         * @param {*} value The value to set.
         * @returns {Object} Returns `object`.
         * @example
         *
         * var object = { 'a': [{ 'b': { 'c': 3 } }] };
         *
         * _.set(object, 'a[0].b.c', 4);
         * console.log(object.a[0].b.c);
         * // => 4
         *
         * _.set(object, ['x', '0', 'y', 'z'], 5);
         * console.log(object.x[0].y.z);
         * // => 5
         */
        function set(object, path, value) {
          return object == null ? object : baseSet(object, path, value);
        }

        /**
         * This method is like `_.set` except that it accepts `customizer` which is
         * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
         * path creation is handled by the method instead. The `customizer` is invoked
         * with three arguments: (nsValue, key, nsObject).
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The object to modify.
         * @param {Array|string} path The path of the property to set.
         * @param {*} value The value to set.
         * @param {Function} [customizer] The function to customize assigned values.
         * @returns {Object} Returns `object`.
         * @example
         *
         * var object = {};
         *
         * _.setWith(object, '[0][1]', 'a', Object);
         * // => { '0': { '1': 'a' } }
         */
        function setWith(object, path, value, customizer) {
          customizer = typeof customizer == 'function' ? customizer : undefined;
          return object == null ? object : baseSet(object, path, value, customizer);
        }

        /**
         * Creates an array of own enumerable string keyed-value pairs for `object`
         * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
         * entries are returned.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @alias entries
         * @category Object
         * @param {Object} object The object to query.
         * @returns {Array} Returns the key-value pairs.
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.toPairs(new Foo);
         * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
         */
        var toPairs = createToPairs(keys);

        /**
         * Creates an array of own and inherited enumerable string keyed-value pairs
         * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
         * or set, its entries are returned.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @alias entriesIn
         * @category Object
         * @param {Object} object The object to query.
         * @returns {Array} Returns the key-value pairs.
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.toPairsIn(new Foo);
         * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
         */
        var toPairsIn = createToPairs(keysIn);

        /**
         * An alternative to `_.reduce`; this method transforms `object` to a new
         * `accumulator` object which is the result of running each of its own
         * enumerable string keyed properties thru `iteratee`, with each invocation
         * potentially mutating the `accumulator` object. If `accumulator` is not
         * provided, a new object with the same `[[Prototype]]` will be used. The
         * iteratee is invoked with four arguments: (accumulator, value, key, object).
         * Iteratee functions may exit iteration early by explicitly returning `false`.
         *
         * @static
         * @memberOf _
         * @since 1.3.0
         * @category Object
         * @param {Object} object The object to iterate over.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @param {*} [accumulator] The custom accumulator value.
         * @returns {*} Returns the accumulated value.
         * @example
         *
         * _.transform([2, 3, 4], function(result, n) {
         *   result.push(n *= n);
         *   return n % 2 == 0;
         * }, []);
         * // => [4, 9]
         *
         * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
         *   (result[value] || (result[value] = [])).push(key);
         * }, {});
         * // => { '1': ['a', 'c'], '2': ['b'] }
         */
        function transform(object, iteratee, accumulator) {
          var isArr = isArray(object),
              isArrLike = isArr || isBuffer(object) || isTypedArray(object);

          iteratee = getIteratee(iteratee, 4);
          if (accumulator == null) {
            var Ctor = object && object.constructor;
            if (isArrLike) {
              accumulator = isArr ? new Ctor : [];
            }
            else if (isObject(object)) {
              accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
            }
            else {
              accumulator = {};
            }
          }
          (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
            return iteratee(accumulator, value, index, object);
          });
          return accumulator;
        }

        /**
         * Removes the property at `path` of `object`.
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Object
         * @param {Object} object The object to modify.
         * @param {Array|string} path The path of the property to unset.
         * @returns {boolean} Returns `true` if the property is deleted, else `false`.
         * @example
         *
         * var object = { 'a': [{ 'b': { 'c': 7 } }] };
         * _.unset(object, 'a[0].b.c');
         * // => true
         *
         * console.log(object);
         * // => { 'a': [{ 'b': {} }] };
         *
         * _.unset(object, ['a', '0', 'b', 'c']);
         * // => true
         *
         * console.log(object);
         * // => { 'a': [{ 'b': {} }] };
         */
        function unset(object, path) {
          return object == null ? true : baseUnset(object, path);
        }

        /**
         * This method is like `_.set` except that accepts `updater` to produce the
         * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
         * is invoked with one argument: (value).
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 4.6.0
         * @category Object
         * @param {Object} object The object to modify.
         * @param {Array|string} path The path of the property to set.
         * @param {Function} updater The function to produce the updated value.
         * @returns {Object} Returns `object`.
         * @example
         *
         * var object = { 'a': [{ 'b': { 'c': 3 } }] };
         *
         * _.update(object, 'a[0].b.c', function(n) { return n * n; });
         * console.log(object.a[0].b.c);
         * // => 9
         *
         * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
         * console.log(object.x[0].y.z);
         * // => 0
         */
        function update(object, path, updater) {
          return object == null ? object : baseUpdate(object, path, castFunction(updater));
        }

        /**
         * This method is like `_.update` except that it accepts `customizer` which is
         * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
         * path creation is handled by the method instead. The `customizer` is invoked
         * with three arguments: (nsValue, key, nsObject).
         *
         * **Note:** This method mutates `object`.
         *
         * @static
         * @memberOf _
         * @since 4.6.0
         * @category Object
         * @param {Object} object The object to modify.
         * @param {Array|string} path The path of the property to set.
         * @param {Function} updater The function to produce the updated value.
         * @param {Function} [customizer] The function to customize assigned values.
         * @returns {Object} Returns `object`.
         * @example
         *
         * var object = {};
         *
         * _.updateWith(object, '[0][1]', _.constant('a'), Object);
         * // => { '0': { '1': 'a' } }
         */
        function updateWith(object, path, updater, customizer) {
          customizer = typeof customizer == 'function' ? customizer : undefined;
          return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
        }

        /**
         * Creates an array of the own enumerable string keyed property values of `object`.
         *
         * **Note:** Non-object values are coerced to objects.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Object
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property values.
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.values(new Foo);
         * // => [1, 2] (iteration order is not guaranteed)
         *
         * _.values('hi');
         * // => ['h', 'i']
         */
        function values(object) {
          return object == null ? [] : baseValues(object, keys(object));
        }

        /**
         * Creates an array of the own and inherited enumerable string keyed property
         * values of `object`.
         *
         * **Note:** Non-object values are coerced to objects.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Object
         * @param {Object} object The object to query.
         * @returns {Array} Returns the array of property values.
         * @example
         *
         * function Foo() {
         *   this.a = 1;
         *   this.b = 2;
         * }
         *
         * Foo.prototype.c = 3;
         *
         * _.valuesIn(new Foo);
         * // => [1, 2, 3] (iteration order is not guaranteed)
         */
        function valuesIn(object) {
          return object == null ? [] : baseValues(object, keysIn(object));
        }

        /*------------------------------------------------------------------------*/

        /**
         * Clamps `number` within the inclusive `lower` and `upper` bounds.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Number
         * @param {number} number The number to clamp.
         * @param {number} [lower] The lower bound.
         * @param {number} upper The upper bound.
         * @returns {number} Returns the clamped number.
         * @example
         *
         * _.clamp(-10, -5, 5);
         * // => -5
         *
         * _.clamp(10, -5, 5);
         * // => 5
         */
        function clamp(number, lower, upper) {
          if (upper === undefined) {
            upper = lower;
            lower = undefined;
          }
          if (upper !== undefined) {
            upper = toNumber(upper);
            upper = upper === upper ? upper : 0;
          }
          if (lower !== undefined) {
            lower = toNumber(lower);
            lower = lower === lower ? lower : 0;
          }
          return baseClamp(toNumber(number), lower, upper);
        }

        /**
         * Checks if `n` is between `start` and up to, but not including, `end`. If
         * `end` is not specified, it's set to `start` with `start` then set to `0`.
         * If `start` is greater than `end` the params are swapped to support
         * negative ranges.
         *
         * @static
         * @memberOf _
         * @since 3.3.0
         * @category Number
         * @param {number} number The number to check.
         * @param {number} [start=0] The start of the range.
         * @param {number} end The end of the range.
         * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
         * @see _.range, _.rangeRight
         * @example
         *
         * _.inRange(3, 2, 4);
         * // => true
         *
         * _.inRange(4, 8);
         * // => true
         *
         * _.inRange(4, 2);
         * // => false
         *
         * _.inRange(2, 2);
         * // => false
         *
         * _.inRange(1.2, 2);
         * // => true
         *
         * _.inRange(5.2, 4);
         * // => false
         *
         * _.inRange(-3, -2, -6);
         * // => true
         */
        function inRange(number, start, end) {
          start = toFinite(start);
          if (end === undefined) {
            end = start;
            start = 0;
          } else {
            end = toFinite(end);
          }
          number = toNumber(number);
          return baseInRange(number, start, end);
        }

        /**
         * Produces a random number between the inclusive `lower` and `upper` bounds.
         * If only one argument is provided a number between `0` and the given number
         * is returned. If `floating` is `true`, or either `lower` or `upper` are
         * floats, a floating-point number is returned instead of an integer.
         *
         * **Note:** JavaScript follows the IEEE-754 standard for resolving
         * floating-point values which can produce unexpected results.
         *
         * @static
         * @memberOf _
         * @since 0.7.0
         * @category Number
         * @param {number} [lower=0] The lower bound.
         * @param {number} [upper=1] The upper bound.
         * @param {boolean} [floating] Specify returning a floating-point number.
         * @returns {number} Returns the random number.
         * @example
         *
         * _.random(0, 5);
         * // => an integer between 0 and 5
         *
         * _.random(5);
         * // => also an integer between 0 and 5
         *
         * _.random(5, true);
         * // => a floating-point number between 0 and 5
         *
         * _.random(1.2, 5.2);
         * // => a floating-point number between 1.2 and 5.2
         */
        function random(lower, upper, floating) {
          if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
            upper = floating = undefined;
          }
          if (floating === undefined) {
            if (typeof upper == 'boolean') {
              floating = upper;
              upper = undefined;
            }
            else if (typeof lower == 'boolean') {
              floating = lower;
              lower = undefined;
            }
          }
          if (lower === undefined && upper === undefined) {
            lower = 0;
            upper = 1;
          }
          else {
            lower = toFinite(lower);
            if (upper === undefined) {
              upper = lower;
              lower = 0;
            } else {
              upper = toFinite(upper);
            }
          }
          if (lower > upper) {
            var temp = lower;
            lower = upper;
            upper = temp;
          }
          if (floating || lower % 1 || upper % 1) {
            var rand = nativeRandom();
            return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
          }
          return baseRandom(lower, upper);
        }

        /*------------------------------------------------------------------------*/

        /**
         * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the camel cased string.
         * @example
         *
         * _.camelCase('Foo Bar');
         * // => 'fooBar'
         *
         * _.camelCase('--foo-bar--');
         * // => 'fooBar'
         *
         * _.camelCase('__FOO_BAR__');
         * // => 'fooBar'
         */
        var camelCase = createCompounder(function(result, word, index) {
          word = word.toLowerCase();
          return result + (index ? capitalize(word) : word);
        });

        /**
         * Converts the first character of `string` to upper case and the remaining
         * to lower case.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to capitalize.
         * @returns {string} Returns the capitalized string.
         * @example
         *
         * _.capitalize('FRED');
         * // => 'Fred'
         */
        function capitalize(string) {
          return upperFirst(toString(string).toLowerCase());
        }

        /**
         * Deburrs `string` by converting
         * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
         * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
         * letters to basic Latin letters and removing
         * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to deburr.
         * @returns {string} Returns the deburred string.
         * @example
         *
         * _.deburr('déjà vu');
         * // => 'deja vu'
         */
        function deburr(string) {
          string = toString(string);
          return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
        }

        /**
         * Checks if `string` ends with the given target string.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to inspect.
         * @param {string} [target] The string to search for.
         * @param {number} [position=string.length] The position to search up to.
         * @returns {boolean} Returns `true` if `string` ends with `target`,
         *  else `false`.
         * @example
         *
         * _.endsWith('abc', 'c');
         * // => true
         *
         * _.endsWith('abc', 'b');
         * // => false
         *
         * _.endsWith('abc', 'b', 2);
         * // => true
         */
        function endsWith(string, target, position) {
          string = toString(string);
          target = baseToString(target);

          var length = string.length;
          position = position === undefined
            ? length
            : baseClamp(toInteger(position), 0, length);

          var end = position;
          position -= target.length;
          return position >= 0 && string.slice(position, end) == target;
        }

        /**
         * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
         * corresponding HTML entities.
         *
         * **Note:** No other characters are escaped. To escape additional
         * characters use a third-party library like [_he_](https://mths.be/he).
         *
         * Though the ">" character is escaped for symmetry, characters like
         * ">" and "/" don't need escaping in HTML and have no special meaning
         * unless they're part of a tag or unquoted attribute value. See
         * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
         * (under "semi-related fun fact") for more details.
         *
         * When working with HTML you should always
         * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
         * XSS vectors.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category String
         * @param {string} [string=''] The string to escape.
         * @returns {string} Returns the escaped string.
         * @example
         *
         * _.escape('fred, barney, & pebbles');
         * // => 'fred, barney, &amp; pebbles'
         */
        function escape(string) {
          string = toString(string);
          return (string && reHasUnescapedHtml.test(string))
            ? string.replace(reUnescapedHtml, escapeHtmlChar)
            : string;
        }

        /**
         * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
         * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to escape.
         * @returns {string} Returns the escaped string.
         * @example
         *
         * _.escapeRegExp('[lodash](https://lodash.com/)');
         * // => '\[lodash\]\(https://lodash\.com/\)'
         */
        function escapeRegExp(string) {
          string = toString(string);
          return (string && reHasRegExpChar.test(string))
            ? string.replace(reRegExpChar, '\\$&')
            : string;
        }

        /**
         * Converts `string` to
         * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the kebab cased string.
         * @example
         *
         * _.kebabCase('Foo Bar');
         * // => 'foo-bar'
         *
         * _.kebabCase('fooBar');
         * // => 'foo-bar'
         *
         * _.kebabCase('__FOO_BAR__');
         * // => 'foo-bar'
         */
        var kebabCase = createCompounder(function(result, word, index) {
          return result + (index ? '-' : '') + word.toLowerCase();
        });

        /**
         * Converts `string`, as space separated words, to lower case.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the lower cased string.
         * @example
         *
         * _.lowerCase('--Foo-Bar--');
         * // => 'foo bar'
         *
         * _.lowerCase('fooBar');
         * // => 'foo bar'
         *
         * _.lowerCase('__FOO_BAR__');
         * // => 'foo bar'
         */
        var lowerCase = createCompounder(function(result, word, index) {
          return result + (index ? ' ' : '') + word.toLowerCase();
        });

        /**
         * Converts the first character of `string` to lower case.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the converted string.
         * @example
         *
         * _.lowerFirst('Fred');
         * // => 'fred'
         *
         * _.lowerFirst('FRED');
         * // => 'fRED'
         */
        var lowerFirst = createCaseFirst('toLowerCase');

        /**
         * Pads `string` on the left and right sides if it's shorter than `length`.
         * Padding characters are truncated if they can't be evenly divided by `length`.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to pad.
         * @param {number} [length=0] The padding length.
         * @param {string} [chars=' '] The string used as padding.
         * @returns {string} Returns the padded string.
         * @example
         *
         * _.pad('abc', 8);
         * // => '  abc   '
         *
         * _.pad('abc', 8, '_-');
         * // => '_-abc_-_'
         *
         * _.pad('abc', 3);
         * // => 'abc'
         */
        function pad(string, length, chars) {
          string = toString(string);
          length = toInteger(length);

          var strLength = length ? stringSize(string) : 0;
          if (!length || strLength >= length) {
            return string;
          }
          var mid = (length - strLength) / 2;
          return (
            createPadding(nativeFloor(mid), chars) +
            string +
            createPadding(nativeCeil(mid), chars)
          );
        }

        /**
         * Pads `string` on the right side if it's shorter than `length`. Padding
         * characters are truncated if they exceed `length`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to pad.
         * @param {number} [length=0] The padding length.
         * @param {string} [chars=' '] The string used as padding.
         * @returns {string} Returns the padded string.
         * @example
         *
         * _.padEnd('abc', 6);
         * // => 'abc   '
         *
         * _.padEnd('abc', 6, '_-');
         * // => 'abc_-_'
         *
         * _.padEnd('abc', 3);
         * // => 'abc'
         */
        function padEnd(string, length, chars) {
          string = toString(string);
          length = toInteger(length);

          var strLength = length ? stringSize(string) : 0;
          return (length && strLength < length)
            ? (string + createPadding(length - strLength, chars))
            : string;
        }

        /**
         * Pads `string` on the left side if it's shorter than `length`. Padding
         * characters are truncated if they exceed `length`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to pad.
         * @param {number} [length=0] The padding length.
         * @param {string} [chars=' '] The string used as padding.
         * @returns {string} Returns the padded string.
         * @example
         *
         * _.padStart('abc', 6);
         * // => '   abc'
         *
         * _.padStart('abc', 6, '_-');
         * // => '_-_abc'
         *
         * _.padStart('abc', 3);
         * // => 'abc'
         */
        function padStart(string, length, chars) {
          string = toString(string);
          length = toInteger(length);

          var strLength = length ? stringSize(string) : 0;
          return (length && strLength < length)
            ? (createPadding(length - strLength, chars) + string)
            : string;
        }

        /**
         * Converts `string` to an integer of the specified radix. If `radix` is
         * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
         * hexadecimal, in which case a `radix` of `16` is used.
         *
         * **Note:** This method aligns with the
         * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
         *
         * @static
         * @memberOf _
         * @since 1.1.0
         * @category String
         * @param {string} string The string to convert.
         * @param {number} [radix=10] The radix to interpret `value` by.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {number} Returns the converted integer.
         * @example
         *
         * _.parseInt('08');
         * // => 8
         *
         * _.map(['6', '08', '10'], _.parseInt);
         * // => [6, 8, 10]
         */
        function parseInt(string, radix, guard) {
          if (guard || radix == null) {
            radix = 0;
          } else if (radix) {
            radix = +radix;
          }
          return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
        }

        /**
         * Repeats the given string `n` times.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to repeat.
         * @param {number} [n=1] The number of times to repeat the string.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {string} Returns the repeated string.
         * @example
         *
         * _.repeat('*', 3);
         * // => '***'
         *
         * _.repeat('abc', 2);
         * // => 'abcabc'
         *
         * _.repeat('abc', 0);
         * // => ''
         */
        function repeat(string, n, guard) {
          if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
            n = 1;
          } else {
            n = toInteger(n);
          }
          return baseRepeat(toString(string), n);
        }

        /**
         * Replaces matches for `pattern` in `string` with `replacement`.
         *
         * **Note:** This method is based on
         * [`String#replace`](https://mdn.io/String/replace).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to modify.
         * @param {RegExp|string} pattern The pattern to replace.
         * @param {Function|string} replacement The match replacement.
         * @returns {string} Returns the modified string.
         * @example
         *
         * _.replace('Hi Fred', 'Fred', 'Barney');
         * // => 'Hi Barney'
         */
        function replace() {
          var args = arguments,
              string = toString(args[0]);

          return args.length < 3 ? string : string.replace(args[1], args[2]);
        }

        /**
         * Converts `string` to
         * [snake case](https://en.wikipedia.org/wiki/Snake_case).
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the snake cased string.
         * @example
         *
         * _.snakeCase('Foo Bar');
         * // => 'foo_bar'
         *
         * _.snakeCase('fooBar');
         * // => 'foo_bar'
         *
         * _.snakeCase('--FOO-BAR--');
         * // => 'foo_bar'
         */
        var snakeCase = createCompounder(function(result, word, index) {
          return result + (index ? '_' : '') + word.toLowerCase();
        });

        /**
         * Splits `string` by `separator`.
         *
         * **Note:** This method is based on
         * [`String#split`](https://mdn.io/String/split).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to split.
         * @param {RegExp|string} separator The separator pattern to split by.
         * @param {number} [limit] The length to truncate results to.
         * @returns {Array} Returns the string segments.
         * @example
         *
         * _.split('a-b-c', '-', 2);
         * // => ['a', 'b']
         */
        function split(string, separator, limit) {
          if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
            separator = limit = undefined;
          }
          limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
          if (!limit) {
            return [];
          }
          string = toString(string);
          if (string && (
                typeof separator == 'string' ||
                (separator != null && !isRegExp(separator))
              )) {
            separator = baseToString(separator);
            if (!separator && hasUnicode(string)) {
              return castSlice(stringToArray(string), 0, limit);
            }
          }
          return string.split(separator, limit);
        }

        /**
         * Converts `string` to
         * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
         *
         * @static
         * @memberOf _
         * @since 3.1.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the start cased string.
         * @example
         *
         * _.startCase('--foo-bar--');
         * // => 'Foo Bar'
         *
         * _.startCase('fooBar');
         * // => 'Foo Bar'
         *
         * _.startCase('__FOO_BAR__');
         * // => 'FOO BAR'
         */
        var startCase = createCompounder(function(result, word, index) {
          return result + (index ? ' ' : '') + upperFirst(word);
        });

        /**
         * Checks if `string` starts with the given target string.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to inspect.
         * @param {string} [target] The string to search for.
         * @param {number} [position=0] The position to search from.
         * @returns {boolean} Returns `true` if `string` starts with `target`,
         *  else `false`.
         * @example
         *
         * _.startsWith('abc', 'a');
         * // => true
         *
         * _.startsWith('abc', 'b');
         * // => false
         *
         * _.startsWith('abc', 'b', 1);
         * // => true
         */
        function startsWith(string, target, position) {
          string = toString(string);
          position = position == null
            ? 0
            : baseClamp(toInteger(position), 0, string.length);

          target = baseToString(target);
          return string.slice(position, position + target.length) == target;
        }

        /**
         * Creates a compiled template function that can interpolate data properties
         * in "interpolate" delimiters, HTML-escape interpolated data properties in
         * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
         * properties may be accessed as free variables in the template. If a setting
         * object is given, it takes precedence over `_.templateSettings` values.
         *
         * **Note:** In the development build `_.template` utilizes
         * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
         * for easier debugging.
         *
         * For more information on precompiling templates see
         * [lodash's custom builds documentation](https://lodash.com/custom-builds).
         *
         * For more information on Chrome extension sandboxes see
         * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category String
         * @param {string} [string=''] The template string.
         * @param {Object} [options={}] The options object.
         * @param {RegExp} [options.escape=_.templateSettings.escape]
         *  The HTML "escape" delimiter.
         * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
         *  The "evaluate" delimiter.
         * @param {Object} [options.imports=_.templateSettings.imports]
         *  An object to import into the template as free variables.
         * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
         *  The "interpolate" delimiter.
         * @param {string} [options.sourceURL='lodash.templateSources[n]']
         *  The sourceURL of the compiled template.
         * @param {string} [options.variable='obj']
         *  The data object variable name.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Function} Returns the compiled template function.
         * @example
         *
         * // Use the "interpolate" delimiter to create a compiled template.
         * var compiled = _.template('hello <%= user %>!');
         * compiled({ 'user': 'fred' });
         * // => 'hello fred!'
         *
         * // Use the HTML "escape" delimiter to escape data property values.
         * var compiled = _.template('<b><%- value %></b>');
         * compiled({ 'value': '<script>' });
         * // => '<b>&lt;script&gt;</b>'
         *
         * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
         * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
         * compiled({ 'users': ['fred', 'barney'] });
         * // => '<li>fred</li><li>barney</li>'
         *
         * // Use the internal `print` function in "evaluate" delimiters.
         * var compiled = _.template('<% print("hello " + user); %>!');
         * compiled({ 'user': 'barney' });
         * // => 'hello barney!'
         *
         * // Use the ES template literal delimiter as an "interpolate" delimiter.
         * // Disable support by replacing the "interpolate" delimiter.
         * var compiled = _.template('hello ${ user }!');
         * compiled({ 'user': 'pebbles' });
         * // => 'hello pebbles!'
         *
         * // Use backslashes to treat delimiters as plain text.
         * var compiled = _.template('<%= "\\<%- value %\\>" %>');
         * compiled({ 'value': 'ignored' });
         * // => '<%- value %>'
         *
         * // Use the `imports` option to import `jQuery` as `jq`.
         * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
         * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
         * compiled({ 'users': ['fred', 'barney'] });
         * // => '<li>fred</li><li>barney</li>'
         *
         * // Use the `sourceURL` option to specify a custom sourceURL for the template.
         * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
         * compiled(data);
         * // => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
         *
         * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
         * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
         * compiled.source;
         * // => function(data) {
         * //   var __t, __p = '';
         * //   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
         * //   return __p;
         * // }
         *
         * // Use custom template delimiters.
         * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
         * var compiled = _.template('hello {{ user }}!');
         * compiled({ 'user': 'mustache' });
         * // => 'hello mustache!'
         *
         * // Use the `source` property to inline compiled templates for meaningful
         * // line numbers in error messages and stack traces.
         * fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
         *   var JST = {\
         *     "main": ' + _.template(mainText).source + '\
         *   };\
         * ');
         */
        function template(string, options, guard) {
          // Based on John Resig's `tmpl` implementation
          // (http://ejohn.org/blog/javascript-micro-templating/)
          // and Laura Doktorova's doT.js (https://github.com/olado/doT).
          var settings = lodash.templateSettings;

          if (guard && isIterateeCall(string, options, guard)) {
            options = undefined;
          }
          string = toString(string);
          options = assignInWith({}, options, settings, customDefaultsAssignIn);

          var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
              importsKeys = keys(imports),
              importsValues = baseValues(imports, importsKeys);

          var isEscaping,
              isEvaluating,
              index = 0,
              interpolate = options.interpolate || reNoMatch,
              source = "__p += '";

          // Compile the regexp to match each delimiter.
          var reDelimiters = RegExp(
            (options.escape || reNoMatch).source + '|' +
            interpolate.source + '|' +
            (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
            (options.evaluate || reNoMatch).source + '|$'
          , 'g');

          // Use a sourceURL for easier debugging.
          var sourceURL = '//# sourceURL=' +
            ('sourceURL' in options
              ? options.sourceURL
              : ('lodash.templateSources[' + (++templateCounter) + ']')
            ) + '\n';

          string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
            interpolateValue || (interpolateValue = esTemplateValue);

            // Escape characters that can't be included in string literals.
            source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);

            // Replace delimiters with snippets.
            if (escapeValue) {
              isEscaping = true;
              source += "' +\n__e(" + escapeValue + ") +\n'";
            }
            if (evaluateValue) {
              isEvaluating = true;
              source += "';\n" + evaluateValue + ";\n__p += '";
            }
            if (interpolateValue) {
              source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
            }
            index = offset + match.length;

            // The JS engine embedded in Adobe products needs `match` returned in
            // order to produce the correct `offset` value.
            return match;
          });

          source += "';\n";

          // If `variable` is not specified wrap a with-statement around the generated
          // code to add the data object to the top of the scope chain.
          var variable = options.variable;
          if (!variable) {
            source = 'with (obj) {\n' + source + '\n}\n';
          }
          // Cleanup code by stripping empty strings.
          source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
            .replace(reEmptyStringMiddle, '$1')
            .replace(reEmptyStringTrailing, '$1;');

          // Frame code as the function body.
          source = 'function(' + (variable || 'obj') + ') {\n' +
            (variable
              ? ''
              : 'obj || (obj = {});\n'
            ) +
            "var __t, __p = ''" +
            (isEscaping
               ? ', __e = _.escape'
               : ''
            ) +
            (isEvaluating
              ? ', __j = Array.prototype.join;\n' +
                "function print() { __p += __j.call(arguments, '') }\n"
              : ';\n'
            ) +
            source +
            'return __p\n}';

          var result = attempt(function() {
            return Function(importsKeys, sourceURL + 'return ' + source)
              .apply(undefined, importsValues);
          });

          // Provide the compiled function's source by its `toString` method or
          // the `source` property as a convenience for inlining compiled templates.
          result.source = source;
          if (isError(result)) {
            throw result;
          }
          return result;
        }

        /**
         * Converts `string`, as a whole, to lower case just like
         * [String#toLowerCase](https://mdn.io/toLowerCase).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the lower cased string.
         * @example
         *
         * _.toLower('--Foo-Bar--');
         * // => '--foo-bar--'
         *
         * _.toLower('fooBar');
         * // => 'foobar'
         *
         * _.toLower('__FOO_BAR__');
         * // => '__foo_bar__'
         */
        function toLower(value) {
          return toString(value).toLowerCase();
        }

        /**
         * Converts `string`, as a whole, to upper case just like
         * [String#toUpperCase](https://mdn.io/toUpperCase).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the upper cased string.
         * @example
         *
         * _.toUpper('--foo-bar--');
         * // => '--FOO-BAR--'
         *
         * _.toUpper('fooBar');
         * // => 'FOOBAR'
         *
         * _.toUpper('__foo_bar__');
         * // => '__FOO_BAR__'
         */
        function toUpper(value) {
          return toString(value).toUpperCase();
        }

        /**
         * Removes leading and trailing whitespace or specified characters from `string`.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to trim.
         * @param {string} [chars=whitespace] The characters to trim.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {string} Returns the trimmed string.
         * @example
         *
         * _.trim('  abc  ');
         * // => 'abc'
         *
         * _.trim('-_-abc-_-', '_-');
         * // => 'abc'
         *
         * _.map(['  foo  ', '  bar  '], _.trim);
         * // => ['foo', 'bar']
         */
        function trim(string, chars, guard) {
          string = toString(string);
          if (string && (guard || chars === undefined)) {
            return string.replace(reTrim, '');
          }
          if (!string || !(chars = baseToString(chars))) {
            return string;
          }
          var strSymbols = stringToArray(string),
              chrSymbols = stringToArray(chars),
              start = charsStartIndex(strSymbols, chrSymbols),
              end = charsEndIndex(strSymbols, chrSymbols) + 1;

          return castSlice(strSymbols, start, end).join('');
        }

        /**
         * Removes trailing whitespace or specified characters from `string`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to trim.
         * @param {string} [chars=whitespace] The characters to trim.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {string} Returns the trimmed string.
         * @example
         *
         * _.trimEnd('  abc  ');
         * // => '  abc'
         *
         * _.trimEnd('-_-abc-_-', '_-');
         * // => '-_-abc'
         */
        function trimEnd(string, chars, guard) {
          string = toString(string);
          if (string && (guard || chars === undefined)) {
            return string.replace(reTrimEnd, '');
          }
          if (!string || !(chars = baseToString(chars))) {
            return string;
          }
          var strSymbols = stringToArray(string),
              end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;

          return castSlice(strSymbols, 0, end).join('');
        }

        /**
         * Removes leading whitespace or specified characters from `string`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to trim.
         * @param {string} [chars=whitespace] The characters to trim.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {string} Returns the trimmed string.
         * @example
         *
         * _.trimStart('  abc  ');
         * // => 'abc  '
         *
         * _.trimStart('-_-abc-_-', '_-');
         * // => 'abc-_-'
         */
        function trimStart(string, chars, guard) {
          string = toString(string);
          if (string && (guard || chars === undefined)) {
            return string.replace(reTrimStart, '');
          }
          if (!string || !(chars = baseToString(chars))) {
            return string;
          }
          var strSymbols = stringToArray(string),
              start = charsStartIndex(strSymbols, stringToArray(chars));

          return castSlice(strSymbols, start).join('');
        }

        /**
         * Truncates `string` if it's longer than the given maximum string length.
         * The last characters of the truncated string are replaced with the omission
         * string which defaults to "...".
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to truncate.
         * @param {Object} [options={}] The options object.
         * @param {number} [options.length=30] The maximum string length.
         * @param {string} [options.omission='...'] The string to indicate text is omitted.
         * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
         * @returns {string} Returns the truncated string.
         * @example
         *
         * _.truncate('hi-diddly-ho there, neighborino');
         * // => 'hi-diddly-ho there, neighbo...'
         *
         * _.truncate('hi-diddly-ho there, neighborino', {
         *   'length': 24,
         *   'separator': ' '
         * });
         * // => 'hi-diddly-ho there,...'
         *
         * _.truncate('hi-diddly-ho there, neighborino', {
         *   'length': 24,
         *   'separator': /,? +/
         * });
         * // => 'hi-diddly-ho there...'
         *
         * _.truncate('hi-diddly-ho there, neighborino', {
         *   'omission': ' [...]'
         * });
         * // => 'hi-diddly-ho there, neig [...]'
         */
        function truncate(string, options) {
          var length = DEFAULT_TRUNC_LENGTH,
              omission = DEFAULT_TRUNC_OMISSION;

          if (isObject(options)) {
            var separator = 'separator' in options ? options.separator : separator;
            length = 'length' in options ? toInteger(options.length) : length;
            omission = 'omission' in options ? baseToString(options.omission) : omission;
          }
          string = toString(string);

          var strLength = string.length;
          if (hasUnicode(string)) {
            var strSymbols = stringToArray(string);
            strLength = strSymbols.length;
          }
          if (length >= strLength) {
            return string;
          }
          var end = length - stringSize(omission);
          if (end < 1) {
            return omission;
          }
          var result = strSymbols
            ? castSlice(strSymbols, 0, end).join('')
            : string.slice(0, end);

          if (separator === undefined) {
            return result + omission;
          }
          if (strSymbols) {
            end += (result.length - end);
          }
          if (isRegExp(separator)) {
            if (string.slice(end).search(separator)) {
              var match,
                  substring = result;

              if (!separator.global) {
                separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');
              }
              separator.lastIndex = 0;
              while ((match = separator.exec(substring))) {
                var newEnd = match.index;
              }
              result = result.slice(0, newEnd === undefined ? end : newEnd);
            }
          } else if (string.indexOf(baseToString(separator), end) != end) {
            var index = result.lastIndexOf(separator);
            if (index > -1) {
              result = result.slice(0, index);
            }
          }
          return result + omission;
        }

        /**
         * The inverse of `_.escape`; this method converts the HTML entities
         * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
         * their corresponding characters.
         *
         * **Note:** No other HTML entities are unescaped. To unescape additional
         * HTML entities use a third-party library like [_he_](https://mths.be/he).
         *
         * @static
         * @memberOf _
         * @since 0.6.0
         * @category String
         * @param {string} [string=''] The string to unescape.
         * @returns {string} Returns the unescaped string.
         * @example
         *
         * _.unescape('fred, barney, &amp; pebbles');
         * // => 'fred, barney, & pebbles'
         */
        function unescape(string) {
          string = toString(string);
          return (string && reHasEscapedHtml.test(string))
            ? string.replace(reEscapedHtml, unescapeHtmlChar)
            : string;
        }

        /**
         * Converts `string`, as space separated words, to upper case.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the upper cased string.
         * @example
         *
         * _.upperCase('--foo-bar');
         * // => 'FOO BAR'
         *
         * _.upperCase('fooBar');
         * // => 'FOO BAR'
         *
         * _.upperCase('__foo_bar__');
         * // => 'FOO BAR'
         */
        var upperCase = createCompounder(function(result, word, index) {
          return result + (index ? ' ' : '') + word.toUpperCase();
        });

        /**
         * Converts the first character of `string` to upper case.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category String
         * @param {string} [string=''] The string to convert.
         * @returns {string} Returns the converted string.
         * @example
         *
         * _.upperFirst('fred');
         * // => 'Fred'
         *
         * _.upperFirst('FRED');
         * // => 'FRED'
         */
        var upperFirst = createCaseFirst('toUpperCase');

        /**
         * Splits `string` into an array of its words.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category String
         * @param {string} [string=''] The string to inspect.
         * @param {RegExp|string} [pattern] The pattern to match words.
         * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
         * @returns {Array} Returns the words of `string`.
         * @example
         *
         * _.words('fred, barney, & pebbles');
         * // => ['fred', 'barney', 'pebbles']
         *
         * _.words('fred, barney, & pebbles', /[^, ]+/g);
         * // => ['fred', 'barney', '&', 'pebbles']
         */
        function words(string, pattern, guard) {
          string = toString(string);
          pattern = guard ? undefined : pattern;

          if (pattern === undefined) {
            return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
          }
          return string.match(pattern) || [];
        }

        /*------------------------------------------------------------------------*/

        /**
         * Attempts to invoke `func`, returning either the result or the caught error
         * object. Any additional arguments are provided to `func` when it's invoked.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Util
         * @param {Function} func The function to attempt.
         * @param {...*} [args] The arguments to invoke `func` with.
         * @returns {*} Returns the `func` result or error object.
         * @example
         *
         * // Avoid throwing errors for invalid selectors.
         * var elements = _.attempt(function(selector) {
         *   return document.querySelectorAll(selector);
         * }, '>_>');
         *
         * if (_.isError(elements)) {
         *   elements = [];
         * }
         */
        var attempt = baseRest(function(func, args) {
          try {
            return apply(func, undefined, args);
          } catch (e) {
            return isError(e) ? e : new Error(e);
          }
        });

        /**
         * Binds methods of an object to the object itself, overwriting the existing
         * method.
         *
         * **Note:** This method doesn't set the "length" property of bound functions.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Util
         * @param {Object} object The object to bind and assign the bound methods to.
         * @param {...(string|string[])} methodNames The object method names to bind.
         * @returns {Object} Returns `object`.
         * @example
         *
         * var view = {
         *   'label': 'docs',
         *   'click': function() {
         *     console.log('clicked ' + this.label);
         *   }
         * };
         *
         * _.bindAll(view, ['click']);
         * jQuery(element).on('click', view.click);
         * // => Logs 'clicked docs' when clicked.
         */
        var bindAll = flatRest(function(object, methodNames) {
          arrayEach(methodNames, function(key) {
            key = toKey(key);
            baseAssignValue(object, key, bind(object[key], object));
          });
          return object;
        });

        /**
         * Creates a function that iterates over `pairs` and invokes the corresponding
         * function of the first predicate to return truthy. The predicate-function
         * pairs are invoked with the `this` binding and arguments of the created
         * function.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Util
         * @param {Array} pairs The predicate-function pairs.
         * @returns {Function} Returns the new composite function.
         * @example
         *
         * var func = _.cond([
         *   [_.matches({ 'a': 1 }),           _.constant('matches A')],
         *   [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
         *   [_.stubTrue,                      _.constant('no match')]
         * ]);
         *
         * func({ 'a': 1, 'b': 2 });
         * // => 'matches A'
         *
         * func({ 'a': 0, 'b': 1 });
         * // => 'matches B'
         *
         * func({ 'a': '1', 'b': '2' });
         * // => 'no match'
         */
        function cond(pairs) {
          var length = pairs == null ? 0 : pairs.length,
              toIteratee = getIteratee();

          pairs = !length ? [] : arrayMap(pairs, function(pair) {
            if (typeof pair[1] != 'function') {
              throw new TypeError(FUNC_ERROR_TEXT);
            }
            return [toIteratee(pair[0]), pair[1]];
          });

          return baseRest(function(args) {
            var index = -1;
            while (++index < length) {
              var pair = pairs[index];
              if (apply(pair[0], this, args)) {
                return apply(pair[1], this, args);
              }
            }
          });
        }

        /**
         * Creates a function that invokes the predicate properties of `source` with
         * the corresponding property values of a given object, returning `true` if
         * all predicates return truthy, else `false`.
         *
         * **Note:** The created function is equivalent to `_.conformsTo` with
         * `source` partially applied.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Util
         * @param {Object} source The object of property predicates to conform to.
         * @returns {Function} Returns the new spec function.
         * @example
         *
         * var objects = [
         *   { 'a': 2, 'b': 1 },
         *   { 'a': 1, 'b': 2 }
         * ];
         *
         * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
         * // => [{ 'a': 1, 'b': 2 }]
         */
        function conforms(source) {
          return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
        }

        /**
         * Creates a function that returns `value`.
         *
         * @static
         * @memberOf _
         * @since 2.4.0
         * @category Util
         * @param {*} value The value to return from the new function.
         * @returns {Function} Returns the new constant function.
         * @example
         *
         * var objects = _.times(2, _.constant({ 'a': 1 }));
         *
         * console.log(objects);
         * // => [{ 'a': 1 }, { 'a': 1 }]
         *
         * console.log(objects[0] === objects[1]);
         * // => true
         */
        function constant(value) {
          return function() {
            return value;
          };
        }

        /**
         * Checks `value` to determine whether a default value should be returned in
         * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
         * or `undefined`.
         *
         * @static
         * @memberOf _
         * @since 4.14.0
         * @category Util
         * @param {*} value The value to check.
         * @param {*} defaultValue The default value.
         * @returns {*} Returns the resolved value.
         * @example
         *
         * _.defaultTo(1, 10);
         * // => 1
         *
         * _.defaultTo(undefined, 10);
         * // => 10
         */
        function defaultTo(value, defaultValue) {
          return (value == null || value !== value) ? defaultValue : value;
        }

        /**
         * Creates a function that returns the result of invoking the given functions
         * with the `this` binding of the created function, where each successive
         * invocation is supplied the return value of the previous.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Util
         * @param {...(Function|Function[])} [funcs] The functions to invoke.
         * @returns {Function} Returns the new composite function.
         * @see _.flowRight
         * @example
         *
         * function square(n) {
         *   return n * n;
         * }
         *
         * var addSquare = _.flow([_.add, square]);
         * addSquare(1, 2);
         * // => 9
         */
        var flow = createFlow();

        /**
         * This method is like `_.flow` except that it creates a function that
         * invokes the given functions from right to left.
         *
         * @static
         * @since 3.0.0
         * @memberOf _
         * @category Util
         * @param {...(Function|Function[])} [funcs] The functions to invoke.
         * @returns {Function} Returns the new composite function.
         * @see _.flow
         * @example
         *
         * function square(n) {
         *   return n * n;
         * }
         *
         * var addSquare = _.flowRight([square, _.add]);
         * addSquare(1, 2);
         * // => 9
         */
        var flowRight = createFlow(true);

        /**
         * This method returns the first argument it receives.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Util
         * @param {*} value Any value.
         * @returns {*} Returns `value`.
         * @example
         *
         * var object = { 'a': 1 };
         *
         * console.log(_.identity(object) === object);
         * // => true
         */
        function identity(value) {
          return value;
        }

        /**
         * Creates a function that invokes `func` with the arguments of the created
         * function. If `func` is a property name, the created function returns the
         * property value for a given element. If `func` is an array or object, the
         * created function returns `true` for elements that contain the equivalent
         * source properties, otherwise it returns `false`.
         *
         * @static
         * @since 4.0.0
         * @memberOf _
         * @category Util
         * @param {*} [func=_.identity] The value to convert to a callback.
         * @returns {Function} Returns the callback.
         * @example
         *
         * var users = [
         *   { 'user': 'barney', 'age': 36, 'active': true },
         *   { 'user': 'fred',   'age': 40, 'active': false }
         * ];
         *
         * // The `_.matches` iteratee shorthand.
         * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
         * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
         *
         * // The `_.matchesProperty` iteratee shorthand.
         * _.filter(users, _.iteratee(['user', 'fred']));
         * // => [{ 'user': 'fred', 'age': 40 }]
         *
         * // The `_.property` iteratee shorthand.
         * _.map(users, _.iteratee('user'));
         * // => ['barney', 'fred']
         *
         * // Create custom iteratee shorthands.
         * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
         *   return !_.isRegExp(func) ? iteratee(func) : function(string) {
         *     return func.test(string);
         *   };
         * });
         *
         * _.filter(['abc', 'def'], /ef/);
         * // => ['def']
         */
        function iteratee(func) {
          return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG));
        }

        /**
         * Creates a function that performs a partial deep comparison between a given
         * object and `source`, returning `true` if the given object has equivalent
         * property values, else `false`.
         *
         * **Note:** The created function is equivalent to `_.isMatch` with `source`
         * partially applied.
         *
         * Partial comparisons will match empty array and empty object `source`
         * values against any array or object value, respectively. See `_.isEqual`
         * for a list of supported value comparisons.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Util
         * @param {Object} source The object of property values to match.
         * @returns {Function} Returns the new spec function.
         * @example
         *
         * var objects = [
         *   { 'a': 1, 'b': 2, 'c': 3 },
         *   { 'a': 4, 'b': 5, 'c': 6 }
         * ];
         *
         * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
         * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
         */
        function matches(source) {
          return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
        }

        /**
         * Creates a function that performs a partial deep comparison between the
         * value at `path` of a given object to `srcValue`, returning `true` if the
         * object value is equivalent, else `false`.
         *
         * **Note:** Partial comparisons will match empty array and empty object
         * `srcValue` values against any array or object value, respectively. See
         * `_.isEqual` for a list of supported value comparisons.
         *
         * @static
         * @memberOf _
         * @since 3.2.0
         * @category Util
         * @param {Array|string} path The path of the property to get.
         * @param {*} srcValue The value to match.
         * @returns {Function} Returns the new spec function.
         * @example
         *
         * var objects = [
         *   { 'a': 1, 'b': 2, 'c': 3 },
         *   { 'a': 4, 'b': 5, 'c': 6 }
         * ];
         *
         * _.find(objects, _.matchesProperty('a', 4));
         * // => { 'a': 4, 'b': 5, 'c': 6 }
         */
        function matchesProperty(path, srcValue) {
          return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
        }

        /**
         * Creates a function that invokes the method at `path` of a given object.
         * Any additional arguments are provided to the invoked method.
         *
         * @static
         * @memberOf _
         * @since 3.7.0
         * @category Util
         * @param {Array|string} path The path of the method to invoke.
         * @param {...*} [args] The arguments to invoke the method with.
         * @returns {Function} Returns the new invoker function.
         * @example
         *
         * var objects = [
         *   { 'a': { 'b': _.constant(2) } },
         *   { 'a': { 'b': _.constant(1) } }
         * ];
         *
         * _.map(objects, _.method('a.b'));
         * // => [2, 1]
         *
         * _.map(objects, _.method(['a', 'b']));
         * // => [2, 1]
         */
        var method = baseRest(function(path, args) {
          return function(object) {
            return baseInvoke(object, path, args);
          };
        });

        /**
         * The opposite of `_.method`; this method creates a function that invokes
         * the method at a given path of `object`. Any additional arguments are
         * provided to the invoked method.
         *
         * @static
         * @memberOf _
         * @since 3.7.0
         * @category Util
         * @param {Object} object The object to query.
         * @param {...*} [args] The arguments to invoke the method with.
         * @returns {Function} Returns the new invoker function.
         * @example
         *
         * var array = _.times(3, _.constant),
         *     object = { 'a': array, 'b': array, 'c': array };
         *
         * _.map(['a[2]', 'c[0]'], _.methodOf(object));
         * // => [2, 0]
         *
         * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
         * // => [2, 0]
         */
        var methodOf = baseRest(function(object, args) {
          return function(path) {
            return baseInvoke(object, path, args);
          };
        });

        /**
         * Adds all own enumerable string keyed function properties of a source
         * object to the destination object. If `object` is a function, then methods
         * are added to its prototype as well.
         *
         * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
         * avoid conflicts caused by modifying the original.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Util
         * @param {Function|Object} [object=lodash] The destination object.
         * @param {Object} source The object of functions to add.
         * @param {Object} [options={}] The options object.
         * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
         * @returns {Function|Object} Returns `object`.
         * @example
         *
         * function vowels(string) {
         *   return _.filter(string, function(v) {
         *     return /[aeiou]/i.test(v);
         *   });
         * }
         *
         * _.mixin({ 'vowels': vowels });
         * _.vowels('fred');
         * // => ['e']
         *
         * _('fred').vowels().value();
         * // => ['e']
         *
         * _.mixin({ 'vowels': vowels }, { 'chain': false });
         * _('fred').vowels();
         * // => ['e']
         */
        function mixin(object, source, options) {
          var props = keys(source),
              methodNames = baseFunctions(source, props);

          if (options == null &&
              !(isObject(source) && (methodNames.length || !props.length))) {
            options = source;
            source = object;
            object = this;
            methodNames = baseFunctions(source, keys(source));
          }
          var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
              isFunc = isFunction(object);

          arrayEach(methodNames, function(methodName) {
            var func = source[methodName];
            object[methodName] = func;
            if (isFunc) {
              object.prototype[methodName] = function() {
                var chainAll = this.__chain__;
                if (chain || chainAll) {
                  var result = object(this.__wrapped__),
                      actions = result.__actions__ = copyArray(this.__actions__);

                  actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
                  result.__chain__ = chainAll;
                  return result;
                }
                return func.apply(object, arrayPush([this.value()], arguments));
              };
            }
          });

          return object;
        }

        /**
         * Reverts the `_` variable to its previous value and returns a reference to
         * the `lodash` function.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Util
         * @returns {Function} Returns the `lodash` function.
         * @example
         *
         * var lodash = _.noConflict();
         */
        function noConflict() {
          if (root._ === this) {
            root._ = oldDash;
          }
          return this;
        }

        /**
         * This method returns `undefined`.
         *
         * @static
         * @memberOf _
         * @since 2.3.0
         * @category Util
         * @example
         *
         * _.times(2, _.noop);
         * // => [undefined, undefined]
         */
        function noop() {
          // No operation performed.
        }

        /**
         * Creates a function that gets the argument at index `n`. If `n` is negative,
         * the nth argument from the end is returned.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Util
         * @param {number} [n=0] The index of the argument to return.
         * @returns {Function} Returns the new pass-thru function.
         * @example
         *
         * var func = _.nthArg(1);
         * func('a', 'b', 'c', 'd');
         * // => 'b'
         *
         * var func = _.nthArg(-2);
         * func('a', 'b', 'c', 'd');
         * // => 'c'
         */
        function nthArg(n) {
          n = toInteger(n);
          return baseRest(function(args) {
            return baseNth(args, n);
          });
        }

        /**
         * Creates a function that invokes `iteratees` with the arguments it receives
         * and returns their results.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Util
         * @param {...(Function|Function[])} [iteratees=[_.identity]]
         *  The iteratees to invoke.
         * @returns {Function} Returns the new function.
         * @example
         *
         * var func = _.over([Math.max, Math.min]);
         *
         * func(1, 2, 3, 4);
         * // => [4, 1]
         */
        var over = createOver(arrayMap);

        /**
         * Creates a function that checks if **all** of the `predicates` return
         * truthy when invoked with the arguments it receives.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Util
         * @param {...(Function|Function[])} [predicates=[_.identity]]
         *  The predicates to check.
         * @returns {Function} Returns the new function.
         * @example
         *
         * var func = _.overEvery([Boolean, isFinite]);
         *
         * func('1');
         * // => true
         *
         * func(null);
         * // => false
         *
         * func(NaN);
         * // => false
         */
        var overEvery = createOver(arrayEvery);

        /**
         * Creates a function that checks if **any** of the `predicates` return
         * truthy when invoked with the arguments it receives.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Util
         * @param {...(Function|Function[])} [predicates=[_.identity]]
         *  The predicates to check.
         * @returns {Function} Returns the new function.
         * @example
         *
         * var func = _.overSome([Boolean, isFinite]);
         *
         * func('1');
         * // => true
         *
         * func(null);
         * // => true
         *
         * func(NaN);
         * // => false
         */
        var overSome = createOver(arraySome);

        /**
         * Creates a function that returns the value at `path` of a given object.
         *
         * @static
         * @memberOf _
         * @since 2.4.0
         * @category Util
         * @param {Array|string} path The path of the property to get.
         * @returns {Function} Returns the new accessor function.
         * @example
         *
         * var objects = [
         *   { 'a': { 'b': 2 } },
         *   { 'a': { 'b': 1 } }
         * ];
         *
         * _.map(objects, _.property('a.b'));
         * // => [2, 1]
         *
         * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
         * // => [1, 2]
         */
        function property(path) {
          return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
        }

        /**
         * The opposite of `_.property`; this method creates a function that returns
         * the value at a given path of `object`.
         *
         * @static
         * @memberOf _
         * @since 3.0.0
         * @category Util
         * @param {Object} object The object to query.
         * @returns {Function} Returns the new accessor function.
         * @example
         *
         * var array = [0, 1, 2],
         *     object = { 'a': array, 'b': array, 'c': array };
         *
         * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
         * // => [2, 0]
         *
         * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
         * // => [2, 0]
         */
        function propertyOf(object) {
          return function(path) {
            return object == null ? undefined : baseGet(object, path);
          };
        }

        /**
         * Creates an array of numbers (positive and/or negative) progressing from
         * `start` up to, but not including, `end`. A step of `-1` is used if a negative
         * `start` is specified without an `end` or `step`. If `end` is not specified,
         * it's set to `start` with `start` then set to `0`.
         *
         * **Note:** JavaScript follows the IEEE-754 standard for resolving
         * floating-point values which can produce unexpected results.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Util
         * @param {number} [start=0] The start of the range.
         * @param {number} end The end of the range.
         * @param {number} [step=1] The value to increment or decrement by.
         * @returns {Array} Returns the range of numbers.
         * @see _.inRange, _.rangeRight
         * @example
         *
         * _.range(4);
         * // => [0, 1, 2, 3]
         *
         * _.range(-4);
         * // => [0, -1, -2, -3]
         *
         * _.range(1, 5);
         * // => [1, 2, 3, 4]
         *
         * _.range(0, 20, 5);
         * // => [0, 5, 10, 15]
         *
         * _.range(0, -4, -1);
         * // => [0, -1, -2, -3]
         *
         * _.range(1, 4, 0);
         * // => [1, 1, 1]
         *
         * _.range(0);
         * // => []
         */
        var range = createRange();

        /**
         * This method is like `_.range` except that it populates values in
         * descending order.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Util
         * @param {number} [start=0] The start of the range.
         * @param {number} end The end of the range.
         * @param {number} [step=1] The value to increment or decrement by.
         * @returns {Array} Returns the range of numbers.
         * @see _.inRange, _.range
         * @example
         *
         * _.rangeRight(4);
         * // => [3, 2, 1, 0]
         *
         * _.rangeRight(-4);
         * // => [-3, -2, -1, 0]
         *
         * _.rangeRight(1, 5);
         * // => [4, 3, 2, 1]
         *
         * _.rangeRight(0, 20, 5);
         * // => [15, 10, 5, 0]
         *
         * _.rangeRight(0, -4, -1);
         * // => [-3, -2, -1, 0]
         *
         * _.rangeRight(1, 4, 0);
         * // => [1, 1, 1]
         *
         * _.rangeRight(0);
         * // => []
         */
        var rangeRight = createRange(true);

        /**
         * This method returns a new empty array.
         *
         * @static
         * @memberOf _
         * @since 4.13.0
         * @category Util
         * @returns {Array} Returns the new empty array.
         * @example
         *
         * var arrays = _.times(2, _.stubArray);
         *
         * console.log(arrays);
         * // => [[], []]
         *
         * console.log(arrays[0] === arrays[1]);
         * // => false
         */
        function stubArray() {
          return [];
        }

        /**
         * This method returns `false`.
         *
         * @static
         * @memberOf _
         * @since 4.13.0
         * @category Util
         * @returns {boolean} Returns `false`.
         * @example
         *
         * _.times(2, _.stubFalse);
         * // => [false, false]
         */
        function stubFalse() {
          return false;
        }

        /**
         * This method returns a new empty object.
         *
         * @static
         * @memberOf _
         * @since 4.13.0
         * @category Util
         * @returns {Object} Returns the new empty object.
         * @example
         *
         * var objects = _.times(2, _.stubObject);
         *
         * console.log(objects);
         * // => [{}, {}]
         *
         * console.log(objects[0] === objects[1]);
         * // => false
         */
        function stubObject() {
          return {};
        }

        /**
         * This method returns an empty string.
         *
         * @static
         * @memberOf _
         * @since 4.13.0
         * @category Util
         * @returns {string} Returns the empty string.
         * @example
         *
         * _.times(2, _.stubString);
         * // => ['', '']
         */
        function stubString() {
          return '';
        }

        /**
         * This method returns `true`.
         *
         * @static
         * @memberOf _
         * @since 4.13.0
         * @category Util
         * @returns {boolean} Returns `true`.
         * @example
         *
         * _.times(2, _.stubTrue);
         * // => [true, true]
         */
        function stubTrue() {
          return true;
        }

        /**
         * Invokes the iteratee `n` times, returning an array of the results of
         * each invocation. The iteratee is invoked with one argument; (index).
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Util
         * @param {number} n The number of times to invoke `iteratee`.
         * @param {Function} [iteratee=_.identity] The function invoked per iteration.
         * @returns {Array} Returns the array of results.
         * @example
         *
         * _.times(3, String);
         * // => ['0', '1', '2']
         *
         *  _.times(4, _.constant(0));
         * // => [0, 0, 0, 0]
         */
        function times(n, iteratee) {
          n = toInteger(n);
          if (n < 1 || n > MAX_SAFE_INTEGER) {
            return [];
          }
          var index = MAX_ARRAY_LENGTH,
              length = nativeMin(n, MAX_ARRAY_LENGTH);

          iteratee = getIteratee(iteratee);
          n -= MAX_ARRAY_LENGTH;

          var result = baseTimes(length, iteratee);
          while (++index < n) {
            iteratee(index);
          }
          return result;
        }

        /**
         * Converts `value` to a property path array.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Util
         * @param {*} value The value to convert.
         * @returns {Array} Returns the new property path array.
         * @example
         *
         * _.toPath('a.b.c');
         * // => ['a', 'b', 'c']
         *
         * _.toPath('a[0].b.c');
         * // => ['a', '0', 'b', 'c']
         */
        function toPath(value) {
          if (isArray(value)) {
            return arrayMap(value, toKey);
          }
          return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
        }

        /**
         * Generates a unique ID. If `prefix` is given, the ID is appended to it.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Util
         * @param {string} [prefix=''] The value to prefix the ID with.
         * @returns {string} Returns the unique ID.
         * @example
         *
         * _.uniqueId('contact_');
         * // => 'contact_104'
         *
         * _.uniqueId();
         * // => '105'
         */
        function uniqueId(prefix) {
          var id = ++idCounter;
          return toString(prefix) + id;
        }

        /*------------------------------------------------------------------------*/

        /**
         * Adds two numbers.
         *
         * @static
         * @memberOf _
         * @since 3.4.0
         * @category Math
         * @param {number} augend The first number in an addition.
         * @param {number} addend The second number in an addition.
         * @returns {number} Returns the total.
         * @example
         *
         * _.add(6, 4);
         * // => 10
         */
        var add = createMathOperation(function(augend, addend) {
          return augend + addend;
        }, 0);

        /**
         * Computes `number` rounded up to `precision`.
         *
         * @static
         * @memberOf _
         * @since 3.10.0
         * @category Math
         * @param {number} number The number to round up.
         * @param {number} [precision=0] The precision to round up to.
         * @returns {number} Returns the rounded up number.
         * @example
         *
         * _.ceil(4.006);
         * // => 5
         *
         * _.ceil(6.004, 2);
         * // => 6.01
         *
         * _.ceil(6040, -2);
         * // => 6100
         */
        var ceil = createRound('ceil');

        /**
         * Divide two numbers.
         *
         * @static
         * @memberOf _
         * @since 4.7.0
         * @category Math
         * @param {number} dividend The first number in a division.
         * @param {number} divisor The second number in a division.
         * @returns {number} Returns the quotient.
         * @example
         *
         * _.divide(6, 4);
         * // => 1.5
         */
        var divide = createMathOperation(function(dividend, divisor) {
          return dividend / divisor;
        }, 1);

        /**
         * Computes `number` rounded down to `precision`.
         *
         * @static
         * @memberOf _
         * @since 3.10.0
         * @category Math
         * @param {number} number The number to round down.
         * @param {number} [precision=0] The precision to round down to.
         * @returns {number} Returns the rounded down number.
         * @example
         *
         * _.floor(4.006);
         * // => 4
         *
         * _.floor(0.046, 2);
         * // => 0.04
         *
         * _.floor(4060, -2);
         * // => 4000
         */
        var floor = createRound('floor');

        /**
         * Computes the maximum value of `array`. If `array` is empty or falsey,
         * `undefined` is returned.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Math
         * @param {Array} array The array to iterate over.
         * @returns {*} Returns the maximum value.
         * @example
         *
         * _.max([4, 2, 8, 6]);
         * // => 8
         *
         * _.max([]);
         * // => undefined
         */
        function max(array) {
          return (array && array.length)
            ? baseExtremum(array, identity, baseGt)
            : undefined;
        }

        /**
         * This method is like `_.max` except that it accepts `iteratee` which is
         * invoked for each element in `array` to generate the criterion by which
         * the value is ranked. The iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Math
         * @param {Array} array The array to iterate over.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {*} Returns the maximum value.
         * @example
         *
         * var objects = [{ 'n': 1 }, { 'n': 2 }];
         *
         * _.maxBy(objects, function(o) { return o.n; });
         * // => { 'n': 2 }
         *
         * // The `_.property` iteratee shorthand.
         * _.maxBy(objects, 'n');
         * // => { 'n': 2 }
         */
        function maxBy(array, iteratee) {
          return (array && array.length)
            ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
            : undefined;
        }

        /**
         * Computes the mean of the values in `array`.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Math
         * @param {Array} array The array to iterate over.
         * @returns {number} Returns the mean.
         * @example
         *
         * _.mean([4, 2, 8, 6]);
         * // => 5
         */
        function mean(array) {
          return baseMean(array, identity);
        }

        /**
         * This method is like `_.mean` except that it accepts `iteratee` which is
         * invoked for each element in `array` to generate the value to be averaged.
         * The iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.7.0
         * @category Math
         * @param {Array} array The array to iterate over.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {number} Returns the mean.
         * @example
         *
         * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
         *
         * _.meanBy(objects, function(o) { return o.n; });
         * // => 5
         *
         * // The `_.property` iteratee shorthand.
         * _.meanBy(objects, 'n');
         * // => 5
         */
        function meanBy(array, iteratee) {
          return baseMean(array, getIteratee(iteratee, 2));
        }

        /**
         * Computes the minimum value of `array`. If `array` is empty or falsey,
         * `undefined` is returned.
         *
         * @static
         * @since 0.1.0
         * @memberOf _
         * @category Math
         * @param {Array} array The array to iterate over.
         * @returns {*} Returns the minimum value.
         * @example
         *
         * _.min([4, 2, 8, 6]);
         * // => 2
         *
         * _.min([]);
         * // => undefined
         */
        function min(array) {
          return (array && array.length)
            ? baseExtremum(array, identity, baseLt)
            : undefined;
        }

        /**
         * This method is like `_.min` except that it accepts `iteratee` which is
         * invoked for each element in `array` to generate the criterion by which
         * the value is ranked. The iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Math
         * @param {Array} array The array to iterate over.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {*} Returns the minimum value.
         * @example
         *
         * var objects = [{ 'n': 1 }, { 'n': 2 }];
         *
         * _.minBy(objects, function(o) { return o.n; });
         * // => { 'n': 1 }
         *
         * // The `_.property` iteratee shorthand.
         * _.minBy(objects, 'n');
         * // => { 'n': 1 }
         */
        function minBy(array, iteratee) {
          return (array && array.length)
            ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
            : undefined;
        }

        /**
         * Multiply two numbers.
         *
         * @static
         * @memberOf _
         * @since 4.7.0
         * @category Math
         * @param {number} multiplier The first number in a multiplication.
         * @param {number} multiplicand The second number in a multiplication.
         * @returns {number} Returns the product.
         * @example
         *
         * _.multiply(6, 4);
         * // => 24
         */
        var multiply = createMathOperation(function(multiplier, multiplicand) {
          return multiplier * multiplicand;
        }, 1);

        /**
         * Computes `number` rounded to `precision`.
         *
         * @static
         * @memberOf _
         * @since 3.10.0
         * @category Math
         * @param {number} number The number to round.
         * @param {number} [precision=0] The precision to round to.
         * @returns {number} Returns the rounded number.
         * @example
         *
         * _.round(4.006);
         * // => 4
         *
         * _.round(4.006, 2);
         * // => 4.01
         *
         * _.round(4060, -2);
         * // => 4100
         */
        var round = createRound('round');

        /**
         * Subtract two numbers.
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Math
         * @param {number} minuend The first number in a subtraction.
         * @param {number} subtrahend The second number in a subtraction.
         * @returns {number} Returns the difference.
         * @example
         *
         * _.subtract(6, 4);
         * // => 2
         */
        var subtract = createMathOperation(function(minuend, subtrahend) {
          return minuend - subtrahend;
        }, 0);

        /**
         * Computes the sum of the values in `array`.
         *
         * @static
         * @memberOf _
         * @since 3.4.0
         * @category Math
         * @param {Array} array The array to iterate over.
         * @returns {number} Returns the sum.
         * @example
         *
         * _.sum([4, 2, 8, 6]);
         * // => 20
         */
        function sum(array) {
          return (array && array.length)
            ? baseSum(array, identity)
            : 0;
        }

        /**
         * This method is like `_.sum` except that it accepts `iteratee` which is
         * invoked for each element in `array` to generate the value to be summed.
         * The iteratee is invoked with one argument: (value).
         *
         * @static
         * @memberOf _
         * @since 4.0.0
         * @category Math
         * @param {Array} array The array to iterate over.
         * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
         * @returns {number} Returns the sum.
         * @example
         *
         * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
         *
         * _.sumBy(objects, function(o) { return o.n; });
         * // => 20
         *
         * // The `_.property` iteratee shorthand.
         * _.sumBy(objects, 'n');
         * // => 20
         */
        function sumBy(array, iteratee) {
          return (array && array.length)
            ? baseSum(array, getIteratee(iteratee, 2))
            : 0;
        }

        /*------------------------------------------------------------------------*/

        // Add methods that return wrapped values in chain sequences.
        lodash.after = after;
        lodash.ary = ary;
        lodash.assign = assign;
        lodash.assignIn = assignIn;
        lodash.assignInWith = assignInWith;
        lodash.assignWith = assignWith;
        lodash.at = at;
        lodash.before = before;
        lodash.bind = bind;
        lodash.bindAll = bindAll;
        lodash.bindKey = bindKey;
        lodash.castArray = castArray;
        lodash.chain = chain;
        lodash.chunk = chunk;
        lodash.compact = compact;
        lodash.concat = concat;
        lodash.cond = cond;
        lodash.conforms = conforms;
        lodash.constant = constant;
        lodash.countBy = countBy;
        lodash.create = create;
        lodash.curry = curry;
        lodash.curryRight = curryRight;
        lodash.debounce = debounce;
        lodash.defaults = defaults;
        lodash.defaultsDeep = defaultsDeep;
        lodash.defer = defer;
        lodash.delay = delay;
        lodash.difference = difference;
        lodash.differenceBy = differenceBy;
        lodash.differenceWith = differenceWith;
        lodash.drop = drop;
        lodash.dropRight = dropRight;
        lodash.dropRightWhile = dropRightWhile;
        lodash.dropWhile = dropWhile;
        lodash.fill = fill;
        lodash.filter = filter;
        lodash.flatMap = flatMap;
        lodash.flatMapDeep = flatMapDeep;
        lodash.flatMapDepth = flatMapDepth;
        lodash.flatten = flatten;
        lodash.flattenDeep = flattenDeep;
        lodash.flattenDepth = flattenDepth;
        lodash.flip = flip;
        lodash.flow = flow;
        lodash.flowRight = flowRight;
        lodash.fromPairs = fromPairs;
        lodash.functions = functions;
        lodash.functionsIn = functionsIn;
        lodash.groupBy = groupBy;
        lodash.initial = initial;
        lodash.intersection = intersection;
        lodash.intersectionBy = intersectionBy;
        lodash.intersectionWith = intersectionWith;
        lodash.invert = invert;
        lodash.invertBy = invertBy;
        lodash.invokeMap = invokeMap;
        lodash.iteratee = iteratee;
        lodash.keyBy = keyBy;
        lodash.keys = keys;
        lodash.keysIn = keysIn;
        lodash.map = map;
        lodash.mapKeys = mapKeys;
        lodash.mapValues = mapValues;
        lodash.matches = matches;
        lodash.matchesProperty = matchesProperty;
        lodash.memoize = memoize;
        lodash.merge = merge;
        lodash.mergeWith = mergeWith;
        lodash.method = method;
        lodash.methodOf = methodOf;
        lodash.mixin = mixin;
        lodash.negate = negate;
        lodash.nthArg = nthArg;
        lodash.omit = omit;
        lodash.omitBy = omitBy;
        lodash.once = once;
        lodash.orderBy = orderBy;
        lodash.over = over;
        lodash.overArgs = overArgs;
        lodash.overEvery = overEvery;
        lodash.overSome = overSome;
        lodash.partial = partial;
        lodash.partialRight = partialRight;
        lodash.partition = partition;
        lodash.pick = pick;
        lodash.pickBy = pickBy;
        lodash.property = property;
        lodash.propertyOf = propertyOf;
        lodash.pull = pull;
        lodash.pullAll = pullAll;
        lodash.pullAllBy = pullAllBy;
        lodash.pullAllWith = pullAllWith;
        lodash.pullAt = pullAt;
        lodash.range = range;
        lodash.rangeRight = rangeRight;
        lodash.rearg = rearg;
        lodash.reject = reject;
        lodash.remove = remove;
        lodash.rest = rest;
        lodash.reverse = reverse;
        lodash.sampleSize = sampleSize;
        lodash.set = set;
        lodash.setWith = setWith;
        lodash.shuffle = shuffle;
        lodash.slice = slice;
        lodash.sortBy = sortBy;
        lodash.sortedUniq = sortedUniq;
        lodash.sortedUniqBy = sortedUniqBy;
        lodash.split = split;
        lodash.spread = spread;
        lodash.tail = tail;
        lodash.take = take;
        lodash.takeRight = takeRight;
        lodash.takeRightWhile = takeRightWhile;
        lodash.takeWhile = takeWhile;
        lodash.tap = tap;
        lodash.throttle = throttle;
        lodash.thru = thru;
        lodash.toArray = toArray;
        lodash.toPairs = toPairs;
        lodash.toPairsIn = toPairsIn;
        lodash.toPath = toPath;
        lodash.toPlainObject = toPlainObject;
        lodash.transform = transform;
        lodash.unary = unary;
        lodash.union = union;
        lodash.unionBy = unionBy;
        lodash.unionWith = unionWith;
        lodash.uniq = uniq;
        lodash.uniqBy = uniqBy;
        lodash.uniqWith = uniqWith;
        lodash.unset = unset;
        lodash.unzip = unzip;
        lodash.unzipWith = unzipWith;
        lodash.update = update;
        lodash.updateWith = updateWith;
        lodash.values = values;
        lodash.valuesIn = valuesIn;
        lodash.without = without;
        lodash.words = words;
        lodash.wrap = wrap;
        lodash.xor = xor;
        lodash.xorBy = xorBy;
        lodash.xorWith = xorWith;
        lodash.zip = zip;
        lodash.zipObject = zipObject;
        lodash.zipObjectDeep = zipObjectDeep;
        lodash.zipWith = zipWith;

        // Add aliases.
        lodash.entries = toPairs;
        lodash.entriesIn = toPairsIn;
        lodash.extend = assignIn;
        lodash.extendWith = assignInWith;

        // Add methods to `lodash.prototype`.
        mixin(lodash, lodash);

        /*------------------------------------------------------------------------*/

        // Add methods that return unwrapped values in chain sequences.
        lodash.add = add;
        lodash.attempt = attempt;
        lodash.camelCase = camelCase;
        lodash.capitalize = capitalize;
        lodash.ceil = ceil;
        lodash.clamp = clamp;
        lodash.clone = clone;
        lodash.cloneDeep = cloneDeep;
        lodash.cloneDeepWith = cloneDeepWith;
        lodash.cloneWith = cloneWith;
        lodash.conformsTo = conformsTo;
        lodash.deburr = deburr;
        lodash.defaultTo = defaultTo;
        lodash.divide = divide;
        lodash.endsWith = endsWith;
        lodash.eq = eq;
        lodash.escape = escape;
        lodash.escapeRegExp = escapeRegExp;
        lodash.every = every;
        lodash.find = find;
        lodash.findIndex = findIndex;
        lodash.findKey = findKey;
        lodash.findLast = findLast;
        lodash.findLastIndex = findLastIndex;
        lodash.findLastKey = findLastKey;
        lodash.floor = floor;
        lodash.forEach = forEach;
        lodash.forEachRight = forEachRight;
        lodash.forIn = forIn;
        lodash.forInRight = forInRight;
        lodash.forOwn = forOwn;
        lodash.forOwnRight = forOwnRight;
        lodash.get = get;
        lodash.gt = gt;
        lodash.gte = gte;
        lodash.has = has;
        lodash.hasIn = hasIn;
        lodash.head = head;
        lodash.identity = identity;
        lodash.includes = includes;
        lodash.indexOf = indexOf;
        lodash.inRange = inRange;
        lodash.invoke = invoke;
        lodash.isArguments = isArguments;
        lodash.isArray = isArray;
        lodash.isArrayBuffer = isArrayBuffer;
        lodash.isArrayLike = isArrayLike;
        lodash.isArrayLikeObject = isArrayLikeObject;
        lodash.isBoolean = isBoolean;
        lodash.isBuffer = isBuffer;
        lodash.isDate = isDate;
        lodash.isElement = isElement;
        lodash.isEmpty = isEmpty;
        lodash.isEqual = isEqual;
        lodash.isEqualWith = isEqualWith;
        lodash.isError = isError;
        lodash.isFinite = isFinite;
        lodash.isFunction = isFunction;
        lodash.isInteger = isInteger;
        lodash.isLength = isLength;
        lodash.isMap = isMap;
        lodash.isMatch = isMatch;
        lodash.isMatchWith = isMatchWith;
        lodash.isNaN = isNaN;
        lodash.isNative = isNative;
        lodash.isNil = isNil;
        lodash.isNull = isNull;
        lodash.isNumber = isNumber;
        lodash.isObject = isObject;
        lodash.isObjectLike = isObjectLike;
        lodash.isPlainObject = isPlainObject;
        lodash.isRegExp = isRegExp;
        lodash.isSafeInteger = isSafeInteger;
        lodash.isSet = isSet;
        lodash.isString = isString;
        lodash.isSymbol = isSymbol;
        lodash.isTypedArray = isTypedArray;
        lodash.isUndefined = isUndefined;
        lodash.isWeakMap = isWeakMap;
        lodash.isWeakSet = isWeakSet;
        lodash.join = join;
        lodash.kebabCase = kebabCase;
        lodash.last = last;
        lodash.lastIndexOf = lastIndexOf;
        lodash.lowerCase = lowerCase;
        lodash.lowerFirst = lowerFirst;
        lodash.lt = lt;
        lodash.lte = lte;
        lodash.max = max;
        lodash.maxBy = maxBy;
        lodash.mean = mean;
        lodash.meanBy = meanBy;
        lodash.min = min;
        lodash.minBy = minBy;
        lodash.stubArray = stubArray;
        lodash.stubFalse = stubFalse;
        lodash.stubObject = stubObject;
        lodash.stubString = stubString;
        lodash.stubTrue = stubTrue;
        lodash.multiply = multiply;
        lodash.nth = nth;
        lodash.noConflict = noConflict;
        lodash.noop = noop;
        lodash.now = now;
        lodash.pad = pad;
        lodash.padEnd = padEnd;
        lodash.padStart = padStart;
        lodash.parseInt = parseInt;
        lodash.random = random;
        lodash.reduce = reduce;
        lodash.reduceRight = reduceRight;
        lodash.repeat = repeat;
        lodash.replace = replace;
        lodash.result = result;
        lodash.round = round;
        lodash.runInContext = runInContext;
        lodash.sample = sample;
        lodash.size = size;
        lodash.snakeCase = snakeCase;
        lodash.some = some;
        lodash.sortedIndex = sortedIndex;
        lodash.sortedIndexBy = sortedIndexBy;
        lodash.sortedIndexOf = sortedIndexOf;
        lodash.sortedLastIndex = sortedLastIndex;
        lodash.sortedLastIndexBy = sortedLastIndexBy;
        lodash.sortedLastIndexOf = sortedLastIndexOf;
        lodash.startCase = startCase;
        lodash.startsWith = startsWith;
        lodash.subtract = subtract;
        lodash.sum = sum;
        lodash.sumBy = sumBy;
        lodash.template = template;
        lodash.times = times;
        lodash.toFinite = toFinite;
        lodash.toInteger = toInteger;
        lodash.toLength = toLength;
        lodash.toLower = toLower;
        lodash.toNumber = toNumber;
        lodash.toSafeInteger = toSafeInteger;
        lodash.toString = toString;
        lodash.toUpper = toUpper;
        lodash.trim = trim;
        lodash.trimEnd = trimEnd;
        lodash.trimStart = trimStart;
        lodash.truncate = truncate;
        lodash.unescape = unescape;
        lodash.uniqueId = uniqueId;
        lodash.upperCase = upperCase;
        lodash.upperFirst = upperFirst;

        // Add aliases.
        lodash.each = forEach;
        lodash.eachRight = forEachRight;
        lodash.first = head;

        mixin(lodash, (function() {
          var source = {};
          baseForOwn(lodash, function(func, methodName) {
            if (!hasOwnProperty.call(lodash.prototype, methodName)) {
              source[methodName] = func;
            }
          });
          return source;
        }()), { 'chain': false });

        /*------------------------------------------------------------------------*/

        /**
         * The semantic version number.
         *
         * @static
         * @memberOf _
         * @type {string}
         */
        lodash.VERSION = VERSION;

        // Assign default placeholders.
        arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
          lodash[methodName].placeholder = lodash;
        });

        // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
        arrayEach(['drop', 'take'], function(methodName, index) {
          LazyWrapper.prototype[methodName] = function(n) {
            n = n === undefined ? 1 : nativeMax(toInteger(n), 0);

            var result = (this.__filtered__ && !index)
              ? new LazyWrapper(this)
              : this.clone();

            if (result.__filtered__) {
              result.__takeCount__ = nativeMin(n, result.__takeCount__);
            } else {
              result.__views__.push({
                'size': nativeMin(n, MAX_ARRAY_LENGTH),
                'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
              });
            }
            return result;
          };

          LazyWrapper.prototype[methodName + 'Right'] = function(n) {
            return this.reverse()[methodName](n).reverse();
          };
        });

        // Add `LazyWrapper` methods that accept an `iteratee` value.
        arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
          var type = index + 1,
              isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;

          LazyWrapper.prototype[methodName] = function(iteratee) {
            var result = this.clone();
            result.__iteratees__.push({
              'iteratee': getIteratee(iteratee, 3),
              'type': type
            });
            result.__filtered__ = result.__filtered__ || isFilter;
            return result;
          };
        });

        // Add `LazyWrapper` methods for `_.head` and `_.last`.
        arrayEach(['head', 'last'], function(methodName, index) {
          var takeName = 'take' + (index ? 'Right' : '');

          LazyWrapper.prototype[methodName] = function() {
            return this[takeName](1).value()[0];
          };
        });

        // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
        arrayEach(['initial', 'tail'], function(methodName, index) {
          var dropName = 'drop' + (index ? '' : 'Right');

          LazyWrapper.prototype[methodName] = function() {
            return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
          };
        });

        LazyWrapper.prototype.compact = function() {
          return this.filter(identity);
        };

        LazyWrapper.prototype.find = function(predicate) {
          return this.filter(predicate).head();
        };

        LazyWrapper.prototype.findLast = function(predicate) {
          return this.reverse().find(predicate);
        };

        LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
          if (typeof path == 'function') {
            return new LazyWrapper(this);
          }
          return this.map(function(value) {
            return baseInvoke(value, path, args);
          });
        });

        LazyWrapper.prototype.reject = function(predicate) {
          return this.filter(negate(getIteratee(predicate)));
        };

        LazyWrapper.prototype.slice = function(start, end) {
          start = toInteger(start);

          var result = this;
          if (result.__filtered__ && (start > 0 || end < 0)) {
            return new LazyWrapper(result);
          }
          if (start < 0) {
            result = result.takeRight(-start);
          } else if (start) {
            result = result.drop(start);
          }
          if (end !== undefined) {
            end = toInteger(end);
            result = end < 0 ? result.dropRight(-end) : result.take(end - start);
          }
          return result;
        };

        LazyWrapper.prototype.takeRightWhile = function(predicate) {
          return this.reverse().takeWhile(predicate).reverse();
        };

        LazyWrapper.prototype.toArray = function() {
          return this.take(MAX_ARRAY_LENGTH);
        };

        // Add `LazyWrapper` methods to `lodash.prototype`.
        baseForOwn(LazyWrapper.prototype, function(func, methodName) {
          var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
              isTaker = /^(?:head|last)$/.test(methodName),
              lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
              retUnwrapped = isTaker || /^find/.test(methodName);

          if (!lodashFunc) {
            return;
          }
          lodash.prototype[methodName] = function() {
            var value = this.__wrapped__,
                args = isTaker ? [1] : arguments,
                isLazy = value instanceof LazyWrapper,
                iteratee = args[0],
                useLazy = isLazy || isArray(value);

            var interceptor = function(value) {
              var result = lodashFunc.apply(lodash, arrayPush([value], args));
              return (isTaker && chainAll) ? result[0] : result;
            };

            if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
              // Avoid lazy use if the iteratee has a "length" value other than `1`.
              isLazy = useLazy = false;
            }
            var chainAll = this.__chain__,
                isHybrid = !!this.__actions__.length,
                isUnwrapped = retUnwrapped && !chainAll,
                onlyLazy = isLazy && !isHybrid;

            if (!retUnwrapped && useLazy) {
              value = onlyLazy ? value : new LazyWrapper(this);
              var result = func.apply(value, args);
              result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
              return new LodashWrapper(result, chainAll);
            }
            if (isUnwrapped && onlyLazy) {
              return func.apply(this, args);
            }
            result = this.thru(interceptor);
            return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
          };
        });

        // Add `Array` methods to `lodash.prototype`.
        arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
          var func = arrayProto[methodName],
              chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
              retUnwrapped = /^(?:pop|shift)$/.test(methodName);

          lodash.prototype[methodName] = function() {
            var args = arguments;
            if (retUnwrapped && !this.__chain__) {
              var value = this.value();
              return func.apply(isArray(value) ? value : [], args);
            }
            return this[chainName](function(value) {
              return func.apply(isArray(value) ? value : [], args);
            });
          };
        });

        // Map minified method names to their real names.
        baseForOwn(LazyWrapper.prototype, function(func, methodName) {
          var lodashFunc = lodash[methodName];
          if (lodashFunc) {
            var key = (lodashFunc.name + ''),
                names = realNames[key] || (realNames[key] = []);

            names.push({ 'name': methodName, 'func': lodashFunc });
          }
        });

        realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
          'name': 'wrapper',
          'func': undefined
        }];

        // Add methods to `LazyWrapper`.
        LazyWrapper.prototype.clone = lazyClone;
        LazyWrapper.prototype.reverse = lazyReverse;
        LazyWrapper.prototype.value = lazyValue;

        // Add chain sequence methods to the `lodash` wrapper.
        lodash.prototype.at = wrapperAt;
        lodash.prototype.chain = wrapperChain;
        lodash.prototype.commit = wrapperCommit;
        lodash.prototype.next = wrapperNext;
        lodash.prototype.plant = wrapperPlant;
        lodash.prototype.reverse = wrapperReverse;
        lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;

        // Add lazy aliases.
        lodash.prototype.first = lodash.prototype.head;

        if (symIterator) {
          lodash.prototype[symIterator] = wrapperToIterator;
        }
        return lodash;
      });

      /*--------------------------------------------------------------------------*/

      // Export lodash.
      var _ = runInContext();

      // Some AMD build optimizers, like r.js, check for condition patterns like:
      if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
        // Expose Lodash on the global object to prevent errors when Lodash is
        // loaded by a script tag in the presence of an AMD loader.
        // See http://requirejs.org/docs/errors.html#mismatch for more details.
        // Use `_.noConflict` to remove Lodash from the global object.
        root._ = _;

        // Define as an anonymous module so, through path mapping, it can be
        // referenced as the "underscore" module.
        define(function() {
          return _;
        });
      }
      // Check for `exports` after `define` in case a build optimizer adds it.
      else if (freeModule) {
        // Export for Node.js.
        (freeModule.exports = _)._ = _;
        // Export for CommonJS support.
        freeExports._ = _;
      }
      else {
        // Export to the global object.
        root._ = _;
      }
    }.call(this));

    }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{}],130:[function(require,module,exports){
    var MapCache = require('./_MapCache');

    /** Error message constants. */
    var FUNC_ERROR_TEXT = 'Expected a function';

    /**
     * Creates a function that memoizes the result of `func`. If `resolver` is
     * provided, it determines the cache key for storing the result based on the
     * arguments provided to the memoized function. By default, the first argument
     * provided to the memoized function is used as the map cache key. The `func`
     * is invoked with the `this` binding of the memoized function.
     *
     * **Note:** The cache is exposed as the `cache` property on the memoized
     * function. Its creation may be customized by replacing the `_.memoize.Cache`
     * constructor with one whose instances implement the
     * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
     * method interface of `clear`, `delete`, `get`, `has`, and `set`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to have its output memoized.
     * @param {Function} [resolver] The function to resolve the cache key.
     * @returns {Function} Returns the new memoized function.
     * @example
     *
     * var object = { 'a': 1, 'b': 2 };
     * var other = { 'c': 3, 'd': 4 };
     *
     * var values = _.memoize(_.values);
     * values(object);
     * // => [1, 2]
     *
     * values(other);
     * // => [3, 4]
     *
     * object.a = 2;
     * values(object);
     * // => [1, 2]
     *
     * // Modify the result cache.
     * values.cache.set(object, ['a', 'b']);
     * values(object);
     * // => ['a', 'b']
     *
     * // Replace `_.memoize.Cache`.
     * _.memoize.Cache = WeakMap;
     */
    function memoize(func, resolver) {
      if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      var memoized = function() {
        var args = arguments,
            key = resolver ? resolver.apply(this, args) : args[0],
            cache = memoized.cache;

        if (cache.has(key)) {
          return cache.get(key);
        }
        var result = func.apply(this, args);
        memoized.cache = cache.set(key, result) || cache;
        return result;
      };
      memoized.cache = new (memoize.Cache || MapCache);
      return memoized;
    }

    // Expose `MapCache`.
    memoize.Cache = MapCache;

    module.exports = memoize;

    },{"./_MapCache":79}],131:[function(require,module,exports){
    var baseSet = require('./_baseSet');

    /**
     * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
     * it's created. Arrays are created for missing index properties while objects
     * are created for all other missing properties. Use `_.setWith` to customize
     * `path` creation.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
     *
     * _.set(object, 'a[0].b.c', 4);
     * console.log(object.a[0].b.c);
     * // => 4
     *
     * _.set(object, ['x', '0', 'y', 'z'], 5);
     * console.log(object.x[0].y.z);
     * // => 5
     */
    function set(object, path, value) {
      return object == null ? object : baseSet(object, path, value);
    }

    module.exports = set;

    },{"./_baseSet":87}],132:[function(require,module,exports){
    var baseToString = require('./_baseToString');

    /**
     * Converts `value` to a string. An empty string is returned for `null`
     * and `undefined` values. The sign of `-0` is preserved.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {string} Returns the converted string.
     * @example
     *
     * _.toString(null);
     * // => ''
     *
     * _.toString(-0);
     * // => '-0'
     *
     * _.toString([1, 2, 3]);
     * // => '1,2,3'
     */
    function toString(value) {
      return value == null ? '' : baseToString(value);
    }

    module.exports = toString;

    },{"./_baseToString":88}],133:[function(require,module,exports){
    (function (Buffer){
    'use strict';
    var isUtf8 = require('is-utf8');

    var stripBom = module.exports = function (arg) {
    	if (typeof arg === 'string') {
    		return arg.replace(/^\ufeff/g, '');
    	}

    	if (Buffer.isBuffer(arg) && isUtf8(arg) &&
    		arg[0] === 0xef && arg[1] === 0xbb && arg[2] === 0xbf) {
    		return arg.slice(3);
    	}

    	return arg;
    };

    stripBom.stream = function () {
    	var firstChunk = require('first-chunk-stream');

    	return firstChunk({minSize: 3}, function (chunk, enc, cb) {
    		this.push(stripBom(chunk));
    		cb();
    	});
    };

    }).call(this,{"isBuffer":require("../grunt-browserify/node_modules/browserify/node_modules/insert-module-globals/node_modules/is-buffer/index.js")})
    },{"../grunt-browserify/node_modules/browserify/node_modules/insert-module-globals/node_modules/is-buffer/index.js":39,"first-chunk-stream":30,"is-utf8":75}],134:[function(require,module,exports){
    module.exports={
      "name": "csvtojson",
      "description": "A tool concentrating on converting csv data to JSON with customised parser supporting",
      "author": "Keyang Xiang <keyang.xiang@gmail.com>",
      "homepage": "https://github.com/Keyang/node-csvtojson",
      "bugs": "https://github.com/Keyang/node-csvtojson/issues",
      "repository": {
        "type": "git",
        "url": "https://github.com/Keyang/node-csvtojson.git"
      },
      "contributors": [
        {
          "name": "Daniel Cohen",
          "email": "dcohenb@gmail.com",
          "url": "https://github.com/dcohenb",
          "contributions": 1,
          "additions": 1,
          "deletions": 6,
          "hireable": true
        },
        {
          "name": "Trang",
          "email": "trangtungn@gmail.com",
          "url": "https://github.com/trangtungn",
          "contributions": 1,
          "additions": 6,
          "deletions": 1,
          "hireable": true
        },
        {
          "name": "Matthias Lienau",
          "email": "matthias@mlienau.de",
          "url": "https://github.com/atufkas",
          "contributions": 9,
          "additions": 74,
          "deletions": 45,
          "hireable": null
        },
        {
          "name": "Alec Fenichel",
          "email": "alec.fenichel@gmail.com",
          "url": "https://github.com/fenichelar",
          "contributions": 1,
          "additions": 1,
          "deletions": 1,
          "hireable": true
        },
        {
          "name": "Blake Blackshear",
          "email": null,
          "url": "https://github.com/blakeblackshear",
          "contributions": 2,
          "additions": 8,
          "deletions": 8,
          "hireable": null
        },
        {
          "name": "Dimitri Kennedy",
          "email": "dimitrikennedy@gmail.com",
          "url": "https://github.com/roodboi",
          "contributions": 2,
          "additions": 3,
          "deletions": 3,
          "hireable": null
        },
        {
          "name": null,
          "email": null,
          "url": "https://github.com/markwithers",
          "contributions": 1,
          "additions": 1,
          "deletions": 1,
          "hireable": null
        },
        {
          "name": "Robert Porter",
          "email": null,
          "url": "https://github.com/colarob",
          "contributions": 1,
          "additions": 64,
          "deletions": 21,
          "hireable": null
        },
        {
          "name": "Jessica Good",
          "email": null,
          "url": "https://github.com/jessicagood",
          "contributions": 1,
          "additions": 8,
          "deletions": 5,
          "hireable": null
        },
        {
          "name": null,
          "email": null,
          "url": "https://github.com/jondayft",
          "contributions": 1,
          "additions": 18,
          "deletions": 0,
          "hireable": null
        },
        {
          "name": "Dane Petersen",
          "email": null,
          "url": "https://github.com/thegreatsunra",
          "contributions": 1,
          "additions": 18920,
          "deletions": 8429,
          "hireable": null
        },
        {
          "name": "Jimi Ford",
          "email": null,
          "url": "https://github.com/JimiHFord",
          "contributions": 1,
          "additions": 5,
          "deletions": 5,
          "hireable": null
        },
        {
          "name": "Hocine Moukaideche",
          "email": null,
          "url": "https://github.com/Off76",
          "contributions": 1,
          "additions": 1,
          "deletions": 1,
          "hireable": true
        },
        {
          "name": "Keyang Xiang",
          "email": "keyang.xiang@gmail.com",
          "url": "https://github.com/Keyang",
          "contributions": 122,
          "additions": 46304,
          "deletions": 65397,
          "hireable": null
        },
        {
          "name": "Ionică Bizău",
          "email": "contact@ionicabizau.net",
          "url": "https://github.com/IonicaBizau",
          "contributions": 1,
          "additions": 98,
          "deletions": 86,
          "hireable": null
        },
        {
          "name": "Sean Lang",
          "email": "slang800@gmail.com",
          "url": "https://github.com/slang800",
          "contributions": 2,
          "additions": 2,
          "deletions": 1,
          "hireable": true
        },
        {
          "name": "Tom Dodson",
          "email": "t3.dodson@gmail.com",
          "url": "https://github.com/t3dodson",
          "contributions": 25,
          "additions": 1485,
          "deletions": 1414,
          "hireable": null
        },
        {
          "name": "Jeff Johnson",
          "email": null,
          "url": "https://github.com/jeffcjohnson",
          "contributions": 1,
          "additions": 1,
          "deletions": 1,
          "hireable": null
        },
        {
          "name": "Amila Welihinda",
          "email": "amilajack@gmail.com",
          "url": "https://github.com/amilajack",
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        },
        {
          "name": "Zsolt R. Molnar",
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      ],
      "version": "1.1.7",
      "keywords": [
        "csv",
        "csv parser",
        "parse csv",
        "csvtojson",
        "json",
        "csv to json",
        "csv convert",
        "tojson",
        "convert csv to json",
        "csv-json"
      ],
      "bin": {
        "csvtojson": "./bin/csvtojson"
      },
      "license": "MIT",
      "engines": {
        "node": ">=0.10"
      },
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        "grunt": "^0.4.5",
        "grunt-browserify": "^4.0.1",
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        "test": "mocha ./test -R spec",
        "test-debug": "mocha debug ./test -R spec",
        "test-all": "mocha  ./test -R spec && CSV_WORKER=3 mocha ./test -R spec "
      }
    }

    },{}]},{},[1]);