Irmin.MakerMaker uses the same type for all internal keys and store all the values in the same store.
module CA : Content_addressable.Makermodule AW : Atomic_write.Makerinclude Key.Store_spec.S
with type ('h, _) contents_key = 'h
with type 'h node_key = 'h
with type 'h commit_key = 'h