Object.prototype.toString redefinition for DOM objects with WeakMap

gistfile1.js

"use strict";

/* ***
** ENVIRONNEMENT SETTING
*/

(function(global){

    var constructorName = "MyDOMNode";
    var MyDOMNodeMap = WeakMap();
    var currentToString = Object.prototype.toString;
    
    
    global[constructorName] = function(){
        var ObjectToReturn = {};
        /* Create the object with property properties, prototype, etc. */
        
        MyDOMNodeMap.set(ObjectToReturn, undefined); // value does not matter. 
        // What is important is the fact that we have a weak map
        
        return ObjectToReturn;
    }

    Object.prototype.toString = function(){
                                    return MyDOMNodeMap.has(this) ?
                                            "[object "+constructorName+"]":         // custom value
                                            currentToString.apply(this, arguments); // default value
                                }

})(window);

(function(global){

    var constructorName = "MyDOMElement";
    var MyDOMNodeMap = WeakMap();
    var currentToString = Object.prototype.toString;
    
    
    global[constructorName] = function(){
        var ObjectToReturn = {};
        /* Create the object with property properties, prototype, etc. */
        
        MyDOMNodeMap.set(ObjectToReturn, undefined); // value does not matter. 
        // What is important is the fact that we have a weak map
        
        return ObjectToReturn;
    }

    Object.prototype.toString = function(){
                                    return MyDOMNodeMap.has(this) ?
                                            "[object "+constructorName+"]":         // custom value
                                            currentToString.apply(this, arguments); // default value
                                }

})(window);



/* ***
** USER CODE
*/

var o1 = {};
console.log(Object.prototype.toString.call(o1));

var o2 =  [];
console.log(Object.prototype.toString.call(o2));

var p1 = Proxy.create({});
console.log(Object.prototype.toString.call(p1));

var p2 = Proxy.createFunction({}, function(){}, function(){});
console.log(Object.prototype.toString.call(p2));

var o3 = new MyDOMNode(); // usually, the constructor cannot be called directly, but you get my point
console.log(Object.prototype.toString.call(o3));

var o4 = new MyDOMElement(); // usually, the constructor cannot be called directly, but you get my point
console.log(Object.prototype.toString.call(o4));