code: function isPrototype(value) {
          var Ctor = value && value.constructor,
              proto =
                  (typeof Ctor == "function" && Ctor.prototype) || objectProto;
  
          return value === proto;
      }
docs: Checks if `value` is likely a prototype object.
  
  @private
  @param {*} value The value to check.
  @returns {boolean} Returns `true` if `value` is a prototype, else `false`.