[quicwg/base-drafts] Remembering transport parameters (#3434)

[Martin Thomson <[e-mail]>]

Our current posture is to be selective about what transport parameters are remembered.  Clients and servers are required to remember a select set of parameters.

@MikeBishop described a more principled approach: remember any transport parameter that the client could transgress with 0-RTT packets.  The implied corollary here is that operation of 0-RTT is not constrained relative to 1-RTT.

Based on that principle, we already have one transport parameter that violates that.  `max_packet_size` is one of those.

I think that we will always have a split here between connection-specific stuff (original destination connection ID, preferred address) and stuff that is necessary for 0-RTT (flow control limits).  Having a principle that we can use to guide that decision would help a great deal.

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