Subject: bug#11309: 24.1.50; Case problems with [:upper:] and Cyrillic, Greek

From: Lars Ingebrigtsen <[email-masked]>
Date: Thu, 10 Dec 2020 16:53:07 +0100

Mattias Engdegård <[email-masked]> writes:

> Well it already did so before (returning ?ß and "SS", respectively)
> and it's not as if we have much of a choice since
> (1) upcase is documented to return a value of the same type as its argument, and
> (2) "SS" is definitely the right return value for "ß".

I can only vaguely read German, but doesn't that depend one the locale?
That is, whether an upcase of ß should be SS or ẞ depends on...  what
time and place we're at?

So returning either, or both (as after your patch), sounds fine to me --
it's an improvement on what Emacs did before.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no