Re: [quicwg/base-drafts] consider making the varint encoding unique (#2299)

[ianswett <[e-mail]>]

Conceptually this is nice and I think @ekr has mentioned this as well in the past.

But as @mikkelfj said, we'd have to carefully think through whether it causes some packetization headaches in practice.  Thinking through our current gQUIC implementation, I don't think it would cause problems.  I guess one could always add a byte or two of padding if the number was shorter than the reserved length?

This prevents or makes very awkward (for better or worse) picking fixed serialization sizes for specific cases(ie: ack blocks and gaps are always 2 bytes) and writing serialization code that assumes that.

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