decide whether session should remain open beyond connection lifetimes

I noticed in my comments that I originally intended sessions to persist beyond connections with the intention that clients could hand off a session id to another connection for further processing. Currently, the sessions are closed with the connection. If there is a real use-case for sessions persisting beyond connections, then it's worth considering.

Alternatively, when creating a new session, allowing persistence beyond the connection lifetime could be an option, but, if the user forgets to close the session, it could cause unintentional memory hoarding.