Xmake Version

xmake v3.0.6+20260104

Operating System Version and Architecture

Arch Linux

Describe Bug

❯ xmake l string.lower "Звезда Хэнсин"
"Звезда Хэнсин"

It should be lowercased, I assume it just skips and do nothing?

Expected Behavior

It handled non-English characters correctly.

❯ xmake l string.lower "Звезда Хэнсин"
"звезда хэнсин"

Project Configuration

Just cli

Additional Information and Error Logs

Nothing special. Would be perfect if we could resolve string.upper for this situation as well.
#7235