Subject: [quicwg/base-drafts] Largest Acknowledged can't be 1 or 2 bytes (#734)

From: Martin Thomson <[email-masked]>
Date: Wed, 16 Aug 2017 02:01:43 +0000 (UTC)

In #731, we found that the encoding for ACK is a little perverse in another way (see #644 for a more comprehensive list of complaints).  The Largest Acknowledged can be 1 or 2 bytes.  However, this field isn't truncated like packet numbers (for the reasons described in #731, this would be hazardous).  And packet numbers start somewhere between 1 and 2^31-1, meaning that it would be very unlikely to have a packet number that was actually small enough to fix in 1 or 2 bytes.  We should not waste a whole bit to describe these two sizes if we can't use them.

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