IE < 9 Object.keys doesn't iterate over non-index enumerable properties.

[jdalton]

As #209 was closed prematurely I'm opening another issue. For this issue:

On 94e0add

var a = Object('x');
a.y = 1;
Object.keys(a);
// should be ["0", "y"]

currently it will only be ["0"]

You can repro the issue here in at least IE8:

[ljharb]

Thanks, it's tough to keep track of all of these :-) I'll leave this open til it's fixed in IE 8.