Same Class Name Cause Problem

[MJEdwin]

    <script>
        (function (window) {
            var root = {};
            function Number() { };

            Number.prototype.show = function () {
                console.log("this is root.Number not window.Number");
            };

            root.Number = Number;

            window.test = root;

        })(window);
    </script>
    <script>
        (function (window) {
            console.log(Number === test.Number); //false

            var funcTest = overload([test.Number], function (num) {
                num.show();
            }).when([Number], function (num) {
                console.log(num);
            });

            funcTest(1); //error TypeError: num.show is not a function
        })(window);
    </script>

[MJEdwin]

How about Use obj.constructor === type to solve this problem in Overload.js