Reposting my response to a similar comment: I don't really want to classify objects. I want to refer to a registration in a registry. Objects can of course be

Reposting my response to a similar comment: I don't really want to classify objects. I want to refer to a registration in a registry. Objects can of course be regidtered many places for many reasons but that is not my concern here. As long as I can serialize the tuple (registry-somone-made, id-in-that-registry) in a standard and readable way that would be a huge step forward