German sharp S uppercase mapping

[Peter Constable]

The case pair stability requirement applies to default data. Conforming applications can still tailor case mapping behaviour use language-specific overrides. However, the default case pairs as defined in the SpecialCasing.txt and UnicodeData.txt files must remain stable so as not to break existing implementations of file systems or other identifier systems that depend on the default case pairs.


Peter

-----Original Message-----
From: Unicode <unicode-bounces at corp.unicode.org> On Behalf Of Daniel Buncic via Unicode
Sent: November 26, 2024 2:44 AM
To: unicode at corp.unicode.org
Subject: Re: German sharp S uppercase mapping

<snip>

As to the case pair stability guarantee, ...  if case folding changes in that language, then Unicode has to adjust.  It would be poor service to the public to stick to a case mapping that is no longer valid just because Unicode came into existence at a time when it was still valid. ...

<snip>