Re: [quicwg/base-drafts] First pass at 7, 14, and 30-bit varint packet numbers (#1334)

[Brian Trammell <[e-mail]>]

britram commented on this pull request.



> @@ -439,12 +439,8 @@ Google QUIC Demultipexing Bit:
 
 Reserved:
 
-: The sixth bit (0x4) of octet 0 is reserved for experimentation.
-
-Short Packet Type:
-
-: The remaining 2 bits of octet 0 include one of 4 packet types.
-  {{short-packet-types}} lists the types that are defined for short packets.
+: The sixth, seventh, and eighth bits (0x7) of octet 0 are reserved for
+experimentation.

>From @mnot's message "Spin Bit -- A Path Forward":
> - The transport draft editors will assure that at least three bits are available for experimentation in the next draft.

I don't think there's consensus yet that the Type field will go away, but the design direction of the protocol so far does not seem to point toward additional path-visible optional parts or forms for the short header, meaning these bits become useless once they're subsumed into the packet number encoding. This seemed like the lower-energy way to get to three bits than working around STUN and GUIC multiplexing.

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