Wrapper.js

var Wrapper = function(obj){
	if(obj == null) obj = {};

	Object.defineProperty(this, "__value__", {
		enumerable: false,
		configurable: true,
		writable: false,
		value: obj
	});

	do {
		var props = Object.getOwnPropertyNames(obj);
		for(prop of props){
			var opts = Object.getOwnPropertyDescriptor(obj, prop);
			if(opts.value){
				var val = this.__value__[prop];
				if(val.typeof(Function)) opts.value = val.bind(this.__value__);
				else opts.value = val;
			}
			try{ Object.defineProperty(this, prop, opts); } catch(err){}
		}
	} while (obj = Object.getPrototypeOf(obj));
};

Object.defineProperty(Object.prototype, "wrap", {
	enumerable: false,
	configurable: true,
	writable: false,
	value: function () {
		this.__proto__ = new Wrapper(this);
		return this;
	}
});

Wrap any type into a Custom Type with all properties and functions from Original Type. e.g. num = new Wrapper(9) then num.toFixed() //-> "9".