Date: Sun, 08 Dec 2019 14:54:55 -0800
From: Martin Thomson <notifications@github.com>
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Message-ID: <quicwg/base-drafts/issues/3273/563005610@github.com>
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Subject: Re: [quicwg/base-drafts] HTTP/3 references QUIC Stream IDs directly, 
 allowing illegal references (#3273)
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There is an assumption that only stream IDs that fit in a 62-bit number work, sure.  The monotonic increase isn't a strong assumption, only that there is some advantage to dividing the space into two with GOAWAY is useful.  You can do that split with totally random allocation of stream IDs and get some advantage; it's only if the stream IDs are monotonically *decreasing* that we get zero utility from GOAWAY.

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<p>There is an assumption that only stream IDs that fit in a 62-bit number work, sure.  The monotonic increase isn't a strong assumption, only that there is some advantage to dividing the space into two with GOAWAY is useful.  You can do that split with totally random allocation of stream IDs and get some advantage; it's only if the stream IDs are monotonically <em>decreasing</em> that we get zero utility from GOAWAY.</p>

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