I don't know what other characters or text functions this affects, but, well:
mw.ustring.lower("ΑΆἈἌἎἉἍἏᾼᾈᾌᾎᾉᾍᾏ")
αάἀἄἆἁἅἇᾼᾈᾌᾎᾉᾍᾏ
mw.ustring.upper("αάἀἄἆἁἅἇᾳᾀᾄᾆᾁᾅᾇ")
ΑΆἈἌἎἉἍἏᾼᾈᾌᾎᾉᾍᾏ
Description
Description
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Related Objects
- Mentioned Here
- T176370: Migrate to PHP 7 in WMF production
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Comment Actions
The behavior of Scribunto's ustring upper and lower methods depends on the behavior of PHP's mb_strtoupper and mb_strtolower, which also exhibit this behavior.
The problem seems to be that PHP's mb_strtolower() ignores any character that doesn't have the "uppercase" Unicode property, and these characters are flagged as "titlecase". Whether that's the correct behavior for mb_strtolower() or whether it should be checking for "uppercase or titlecase", I have no idea. But even if it is incorrect, it's not something that we're going to be able to fix here. You'll need to take it to https://bugs.php.net/; please comment here with the upstream bug number once you find/create it.
Comment Actions
This is in the process of being fixed by T176370: Migrate to PHP 7 in WMF production. I'm going to close this as a duplicate of that task.