michael@0: var arr = [];
michael@0: Object.defineProperty(arr, 4, {
michael@0:   configurable: true,
michael@0:   enumerable: false,
michael@0:   writable: false,
michael@0:   value: undefined
michael@0: });
michael@0: for (var y = 0; y < 2; y++)
michael@0:   arr.length = 0;