code: function deepExtend() {
    var args = Array.prototype.slice.call(arguments); // Make real array from arguments
    args.unshift(true); // Add `true` as first arg.
    extend$1.apply(this, args);
  }
docs: A more semantic convenience function. Delegates to {@link extend} and passes `true` as the first argument. Deep merge the contents of two or more objects together into the first object.
  
  @function deepExtend
  @param {Object} destination The object to modify
  @param {Object} source The object whose keys to take
  @param {Object} [source2] Optional, You can add any number of objects as arguments.
  @returns {Object} result The merged object. Note that the `destination` object will always be modified.
  
  @example
  var object1 = {
  apple: 0,
  banana: { weight: 52, price: 100 },
  cherry: 97
  }
  var object2 = {
  banana: { price: 200 },
  almond: 100
  }
  io.deepExtend(object1, object2)
  console.log(object1)
  //  {
  //   apple: 0,
  //   banana: {
  //     weight: 52,
  //     price: 200
  //   },
  //   cherry: 97,
  //   almond: 100
  // }