michael@0: var n = 0;
michael@0: var a = [];
michael@0: for (var i = 0; i < 20; i++)
michael@0:     a[i] = {};
michael@0: a[18].watch("p", function () { n++; });
michael@0: delete a[18].p;
michael@0: for (var i = 0; i < 20; i++)
michael@0:     a[i].p = 0;
michael@0: assertEq(n, 1);