What if, on a resumption failure, a server could include the 'h' attribute, to mean "I can't actually resume your state, but I did get all the stanzas up until H".
I think this allows servers to hold onto this small amount of state for considerably longer than it's desirable to keep a disconnected session live, and it also makes a halfway house between ack-only and full resumption possible for other servers. Thoughts? Also, do you think we could add this attribute without a version bump? Dave.
