ng-repeat not working over collections that contains dupes

The following code is not working because the collection contains dupes:

<div ng-repeat="value in [4, 4]"></div>

I think that the following should work but is unfortunately not working:

<div ng-repeat="value in [4, 4] track by $index"></div>

Is that a bug?

Is there a way to use ng-repeat over a collection that contains dupes?

Thanks in advance,

Olivier