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Re: New Version Notification for draft-kamp-httpbis-structure-01.txt (fwd)

"Poul-Henning Kamp" <phk@phk.freebsd.dk> Thu, 17 November 2016 08:37 UTC

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To: Willy Tarreau <w@1wt.eu>
cc: Kazuho Oku <kazuhooku@gmail.com>, HTTP Working Group <ietf-http-wg@w3.org>
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From: Poul-Henning Kamp <phk@phk.freebsd.dk>
References: <78354.1477853918@critter.freebsd.dk> <CANatvzx5RSnnN9ybqh6tRqKV=7NVO+PTpgAuVUU+6JuKGFtczg@mail.gmail.com> <20161117055345.GB9646@1wt.eu>
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Subject: Re: New Version Notification for draft-kamp-httpbis-structure-01.txt (fwd)
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--------
In message <20161117055345.GB9646@1wt.eu>, Willy Tarreau writes:

>In my opinion we don't care here. And maybe we can document the expected
>minimal precision (eg: minimum 53 bits to be able to store a 32-bit
>integral range with a 1/1000000 fractional precision.

Uhm, guys:

       number = ["-"] 1*15 DIGIT
               # XXX: Not sure how to do this in ABNF:
               # XXX: A single "." allowed between any two digits
               # The range is limited is to ensure it can be
               # correctly represented in IEEE754 64 bit
               # binary floating point format.

Please notice:

	1) If there is a period, it _has_ to be between to digits.

	2) max 15 digits in total, so that people stuffing them in
	   ieee64bin aka double, don't get surprises.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
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