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﻿'use strict';

module.exports = function sort(fn) {
  var collection = [].concat(this.items);

  if (fn === undefined) {
    if (this.every(function (item) {
      return typeof item === 'number';
    })) {
      collection.sort(function (a, b) {
        return a - b;
      });
    } else {
      collection.sort();
    }
  } else {
    collection.sort(fn);
  }

  return new this.constructor(collection);
};