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From: "fw at deneb dot enyo.de" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug locale/2373] Restrict UTF-8 to 17 planes, as required by RFC 3629
Date: Tue, 30 Jun 2020 13:05:56 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D2373

--- Comment #11 from Florian Weimer <fw at deneb dot enyo.de> ---
(In reply to Andreas Schwab from comment #7)
> RFC 2044 defines UTF-8 as a 1-6 octet encoding, referencing ISO/IEC
> 10646-1:1993 as the source.  This was eventually updated by RFC 3629, whi=
ch
> introduced the U+10FFFF limit, but citing ISO/IEC 10646-1:2000 as without
> that limit.

This is very misleading. I have a copy of ISO/IEC 10646-1 : 2000(E), bought
directly from ISO, and Annex D (which is normative) still specifies 7FFF FF=
FF
as the maximum UCS-4 value.

If UTF-8 is restricted to 17 planes in ISO 10646, this restriction has been
introduced in a later version of the standard.

I don't think this matters because RFC 3629 is a publicly accessible standa=
rd,
so I think this is what we should follow anyway.

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