code: function shimIsPlainObject(value) {
    var Ctor;
  
    // Exit early for non `Object` objects.
    if (!(isObjectLike(value) && objToString.call(value) == objectTag && !isHostObject(value)) ||
        (!hasOwnProperty.call(value, 'constructor') &&
          (Ctor = value.constructor, typeof Ctor == 'function' && !(Ctor instanceof Ctor))) ||
        (!support.argsTag && isArguments(value))) {
      return false;
    }
    // IE < 9 iterates inherited properties before own properties. If the first
    // iterated property is an object's own property then there are no inherited
    // enumerable properties.
    var result;
    if (support.ownLast) {
      baseForIn(value, function(subValue, key, object) {
        result = hasOwnProperty.call(object, key);
        return false;
      });
      return result !== false;
    }
    // In most environments an object's own properties are iterated before
    // its inherited properties. If the last iterated property is an object's
    // own property then there are no inherited enumerable properties.
    baseForIn(value, function(subValue, key) {
      result = key;
    });
    return typeof result == 'undefined' || hasOwnProperty.call(value, result);
  }
docs: A fallback implementation of `_.isPlainObject` which checks if `value`
  is an object created by the `Object` constructor or has a `[[Prototype]]`
  of `null`.
  
  @private
  @param {*} value The value to check.
  @returns {boolean} Returns `true` if `value` is a plain object, else `false`.