See #12, especially:

If we are considering storage add-ons, why should the storage contain any restrictions at all (positives, integers)? Opening the extensions functionality via delegates sounds like a recipe concept to me. In this case, the storage class should not bundle a single recipe by itself – it should just make them possible.

This, of course, doesn't mean that we cannot bundle recipes with the extension. I'm just saying that they should be added the way extension would have to do it (thinking of our main features count, count-positive, integers).