Hi, I'm trying to derive Lift instances for HashMap and HashSet as done in th-lift-instances for Set and Map from containers (specifically here) so that I can use them with Typed Template Haskell.

However, deriving Lift as an orphan instance requires access to the constructors which I'd expect from the Internal version of the HashSet and HashMap modules but that is not the case. HashMap partially exposes it, however, it uses types such as HashMap.Array.Array which doesn't expose its constructors.

Is there a reason for this?