michael@0: function f(s) {
michael@0:     var q;
michael@0:     for (var i = 0; i < 10000; i++)
michael@0:         q = ~s;
michael@0:     return q;
michael@0: }
michael@0: var obj = { valueOf: function () { return 3; } }
michael@0: assertEq(f(obj), -4);
michael@0: