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[Idna-update] Question about ℀

Shawn Steele <Shawn.Steele@microsoft.com> Wed, 08 August 2018 00:21 UTC

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From: Shawn Steele <Shawn.Steele@microsoft.com>
To: "idna-update@ietf.org" <idna-update@ietf.org>
Thread-Topic: Question about ℀
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Date: Wed, 08 Aug 2018 00:21:27 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idna-update/lA73_W6ZGKUyCrg_4GwryKwbh-Y>
Subject: [Idna-update] Question about ℀
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For characters like ℀, would it be permissible to disallow them in the mapping step?  Currently the tables allow mapping ℀ to a/c, which is obviously not very great behavior since / is illegal in DNS.

USE_STD3_ASCII_RULES would clearly stomp out things like this, but it seems to me that it doesn’t really make sense to map these characters at all.

Am I missing some scenario?  Is there already a known list of this type of problematic characters somewhere?  (I can figure it out, but it doesn’t hurt to double check.)

-Shawn

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http://blogs.msdn.com/shawnste

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