Back out 97036ab72558 which inappropriately compared turds to third parties.
3 var a = [new Date, new Date, new Date, new Date, new Date];
4 for (var i = 0; i < 5; i++)
5 a[i].m = function () {return x};
6 for (i = 0; i < 4; i++)
7 if (a[i].m == a[i+1].m)