Markus Scherer at
Wed Aug 13 20:41:29 CEST 2014

One big reason why sharp s and sigma are problematic in IDNA2008 is that
users have gotten used to domain names being case-insensitive, and when
that's the case, then sharp s and ss need to be the same, just like the
three sigmas. And that's why IDNA2003 mapped them to the same things.

In addition, in German the use of ß is confusing even to natives, and has
changed in the 1996 spelling reform, and ß is never used in de-CH, etc.

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