This section isn't new either. I agree with your comments and thought so myself went adding the session window. I would like to do that separately from cleaning up existing problems with the spec, as I mean to propose this to the HTTPbis WG as per the action item given me. I think we should do the editorial cleanups in a separate change.

I thought about the WINDOW_UPDATE for the wrong direction of stream id as well. I'm inclined to treat it as a session error.