Re: [quicwg/base-drafts] Coalescing different CIDs for same connection (#3800)

[Mike Bishop <[e-mail]>]

I think we need to make *a* change, in one direction or the other.  It's unfortunate to mix CIDs, since it clearly links them to any observer, but doesn't seem like a big deal.  For some implementations, it sounds like it's a big deal to avoid mixing them.  Therefore, while I'm content with either resolution, it seems like it makes more sense to resolve toward being more permissive; e.g. #3870.

Mixing packets from different connections seems like a generally bad idea, since it assumes an implementation structure on the far end for it to work.  The more likely outcome is that coalesced packets from other connections will simply be dropped as invalid.  (Of course, this very property could be used for padding / misleading observers.)

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