From a user's PoV who is not involved in technical details under the hood I prefer your suggestion from comment #1. In the context of shared repos I think that it is safe to say that the user expects repos inside a shared repo inherit the format of their master/parent. Therefore I feel the format name of the repo should reflect this. So things like "<format shared repo>/<format repo>" would be nice and helpful imho.
From a user's PoV who is not involved in technical details under the hood I prefer your suggestion from comment #1. In the context of shared repos I think that it is safe to say that the user expects repos inside a shared repo inherit the format of their master/parent. Therefore I feel the format name of the repo should reflect this. So things like "<format shared repo>/<format repo>" would be nice and helpful imho.