In programming languages it's much worse. Identifiers can either be unidentifiable, and if so everybody has a different opinion what "identifiable" means. Even

In programming languages it's much worse. Identifiers can either be unidentifiable, and if so everybody has a different opinion what "identifiable" means. Even the standard on identifiers, UTF-39, is buggy and has too many interpretations, leading to a complete disaster. https://github.com/rurban/libu8ident/blob/master/doc/c11.md https://github.com/rurban/libu8ident/blob/master/doc/c11.md In punycode domain names it's quite simple still. With other names, it's even worse. No-one cares. Linkers do not, username and filesystem drivers do not. The Apple HFS+ did care a bit one day, until someone in the higher ranks decided that no-one needs unicode security anymore and switched the new APFS to unsafe again.