Could `(posh! conn)` return updated conn instead of mutating conn?

[theronic]

It would be nice if a connection was as close to an unrealized value as db is in Datomic land, and poshing a conn would make a conn that is now monitored.

I'm half-asking because I've been tripped up on when/where I call posh! (dunno what happens if I call it multiple times), and because I'd like to understand the internals better :).

Thanks for posh! It's great :)