code: function isPlainObject(value) {
    if (!isObjectLike_1(value) || _baseGetTag(value) != objectTag$3) {
      return false;
    }
    var proto = _getPrototype(value);
    if (proto === null) {
      return true;
    }
    var Ctor = hasOwnProperty$9.call(proto, 'constructor') && proto.constructor;
    return typeof Ctor == 'function' && Ctor instanceof Ctor &&
      funcToString$2.call(Ctor) == objectCtorString;
  }
docs: 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