Again, you don't need to reincorporate all of this logic. You just need to...

0. If not `self._is_curated` call the superclass' implementation and return it.
1. Evaluate the `curated_qs` and get the count of elements in it.
2. For single items, either pull the one item from the curated_qs or call `super(CuratedQuerySet, self).__getitem__` for the index-adjusted-by-`curated_qs`-size index
3. For slices, determine if the slice falls in the `curated_qs`, `self`, or both. Adjust the indices of the slice for self based on `curated_qs` size, and return the chain of them both.