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Re: [Uta] Browser behavior in draft-ietf-uta-rfc6125bis

John Levine <johnl@taugh.com> Fri, 27 January 2023 17:38 UTC

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From: John Levine <johnl@taugh.com>
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Cc: Corey.Bonnell@digicert.com
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Subject: Re: [Uta] Browser behavior in draft-ietf-uta-rfc6125bis
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It appears that Corey Bonnell  <Corey.Bonnell@digicert.com> said:
>Thanks for the pointer to this text. It is a very interesting statement, mainly because the illustrative example does not align
>with the first sentence. The A-label “xn--53h” contains a single code point “Hot Beverage” U+2615. This code point was
>first assigned in Unicode 4.0, so it is not part of the IDNA 2003 character repertoire. ...

See the ToASCII descrition in IDNA2003, which says to turn on the
AllowUnassigned flag, so in practice 2003 allows codepoints added
later, I assume in the hope that they wouldn't have to update it each
time Unicode changed. We now know why that was a bad idea, and
IDNA2008 has explicit lists that have to be updated.

If you look at the .COM zone, you will find a bunch of old IDN names
with junk characters registered using IDNA2003 before the current
codepoint rules were established.

R's,
John

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