code: function isHostType(object, property) {
        if (object == null) {
          return false;
        }
        var type = typeof object[property];
        return !rePrimitive.test(type) && (type != 'object' || !!object[property]);
      }
docs: Host objects can return type values that are different from their actual
  data type. The objects we are concerned with usually return non-primitive
  types of "object", "function", or "unknown".
  
  @private
  @param {*} object The owner of the property.
  @param {string} property The property to check.
  @returns {boolean} Returns `true` if the property value is a non-primitive, else `false`.