public static FunctionPrototype CreatePrototypeObject(Engine engine)
        {
            var obj = new FunctionPrototype(engine);

            obj.Extensible = true;

            // The value of the [[Prototype]] internal property of the Function prototype object is the standard built-in Object prototype object
            obj.Prototype = engine.Object.PrototypeObject;

            obj.FastAddProperty("length", 0, false, false, false);

            return(obj);
        }
        public static FunctionConstructor CreateFunctionConstructor(Engine engine)
        {
            var obj = new FunctionConstructor(engine);

            obj.Extensible = true;

            // The initial value of Function.prototype is the standard built-in Function prototype object
            obj.PrototypeObject = FunctionPrototype.CreatePrototypeObject(engine);

            // The value of the [[Prototype]] internal property of the Function constructor is the standard built-in Function prototype object
            obj.Prototype = obj.PrototypeObject;

            obj.FastAddProperty("prototype", obj.PrototypeObject, false, false, false);

            obj.FastAddProperty("length", 1, false, false, false);

            return(obj);
        }