Re: case-insensitive string comparison

[Sam Steingold]

> * Sam Steingold <fqf@tah.bet> [2022-07-20 12:22:33 -0400]:
>
>> * Stefan Monnier <zbaavre@veb.hzbagerny.pn> [2022-07-19 23:01:31 -0400]:
>>
>>> PS. Actually, compare-strings/ignore_case is broken because it does,
>>> essentially, upcase both arguments, see 
>>> https://stackoverflow.com/q/319426/850781
>>
>> Hmm... `string-collate-equalp`?
>
> (string-collate-equalp "a" "A" current-locale-environment t)
> ==> nil
> current-locale-environment
> ==> "en_US.UTF-8"

So, how do we do case-insensitive string comparison in Emacs?

It is okay to add a `string-equal-ignore-case' based on `compare-strings'?
(even though it does not recognize "SS" and "ß" as equal)

Or should we first implement something like casefold in Python?
https://docs.python.org/3/library/stdtypes.html#str.casefold

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