Proxy pretending to be arrays

gistfile1.js

(function(global){
  // Place to store fake arrays
  var myProxyArrays = new WeakMap();

  global.ProxyArray = (function(){
    var handler, call, construct;
    // See https://github.com/DavidBruant/ProxyArray for actual implementation

    return function(){
             var p = Proxy.createFunction(handler, call, construct); // 
             myProxyArrays.set(p, "whatev's"); // Value doesn't matter. Only presence and weak reference to avoid mem leaks
             return p;
           };
  })();
  
  // redefining Object.prototype.toString
  var NativeOptS = Object.prototype.toString;
  Object.prototype.toString = function(){
                                return myProxyArrays.has(this) ?
                                         "[Object Array]" : // pretending it's an array
                                         NativeOptS.apply(this, arguments);
                              };

  // redefining Array.isArray
  var NativeIsArray = Array.isArray;
  Array.isArray = function(o){
                    return myProxyArrays.has(o) ?
                             true : // pretending it's an array
                             NativeIsArray(o);
                    };
})(this);