Yes. I'm the one who implemented the case folding the `fd` uses (via its regex engine). See: https://github.com/rust-lang/regex/blob/master/UNICODE.md#rl15-sim

Yes. I'm the one who implemented the case folding the `fd` uses (via its regex engine). See: https://github.com/rust-lang/regex/blob/master/UNICODE.md#rl15-simple-loose-matches https://github.com/rust-lang/regex/blob/master/UNICODE.md#rl... And then Unicode itself for more discussion on the topic: https://unicode.org/reports/tr18/#Simple_Loose_Matches https://unicode.org/reports/tr18/#Simple_Loose_Matches TR18 used to have a Level 3[1] with the kind of locale-specific custom tailoring support found in GNU's implementation of POSIX locales, but it was so fraught that it was retracted completely some years ago. [1]: https://unicode.org/reports/tr18/#Tailored_Support https://unicode.org/reports/tr18/#Tailored_Support