michael@0: 
michael@0: setObjectMetadataCallback(function(obj) {});
michael@0: function foo(x, y) {
michael@0:   this.g = x + y;
michael@0: }
michael@0: var a = 0;
michael@0: var b = { valueOf: function() Object.defineProperty(Object.prototype, 'g', {}) };
michael@0: var c = new foo(a, b);