Back out 97036ab72558 which inappropriately compared turds to third parties.
1 function f(a=1, b=2, c=3) { return arguments; }
3 assertEq(args.length, 0);
4 assertEq("0" in args, false);
6 assertEq(args.length, 2);
8 args = f(9, 8, 7, 6, 5);
9 assertEq(args.length, 5);