Kind of like a bug in PHP where identifiers with i in them didn't work properly if the locale was Turkish since PHP managed its case insensitivity by uppercasin

Kind of like a bug in PHP where identifiers with i in them didn't work properly if the locale was Turkish since PHP managed its case insensitivity by uppercasing the identifiers, but used a locale-dependent format in which, if the locale specified Turkish, would uppercase i to İ rather than I.