Well, a string is unicode nowadays. And for sure not just a zero-terminated blob. That would be a buffer. Only the Linux kernel still holds this invalid view.

Well, a string is unicode nowadays. And for sure not just a zero-terminated blob. That would be a buffer. Only the Linux kernel still holds this invalid view. So every string library needs at least a compare function to find strings, with all the variants of same graphemes. Which leads us to NFC normalization for a start. Upcase tables and wordlength tables are also needed.