Re: [quicwg/base-drafts] Make HTTP frames a TLV format. This has several advantages: (#2235)

[Mike Bishop <[e-mail]>]

The previous discussion was #1351.  The conclusion there was that the order doesn't matter a great deal (under the assumption that you need both), and so consistency with HTTP/2 was the tie-break.

If there's a desire to enable length-less frames, that's an argument for TLV.  However, I don't think switching on the type value first is terribly compelling -- there doesn't seem to be a great difference between:
- passing your frame parser the type and expecting it to tell you how many bytes of the stream it processed and whether the frame was valid
- passing your frame parser the type and length and expecting it to tell you if the frame was mis-sized

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