Ap |UV |swash_fetch |SV *sv|U8 *ptr|bool do_utf8
Ap |void |taint_env
Ap |void |taint_proper |const char* f|const char* s
+Ap |UV |to_utf8_case |U8 *p|U8* ustrp|STRLEN *lenp \
+ |SV **swash|char *normal|char *special
Ap |UV |to_utf8_lower |U8 *p|U8* ustrp|STRLEN *lenp
Ap |UV |to_utf8_upper |U8 *p|U8* ustrp|STRLEN *lenp
Ap |UV |to_utf8_title |U8 *p|U8* ustrp|STRLEN *lenp