AmdbR |char* |sv_pvutf8 |NN SV *sv
AmdbR |char* |sv_pvbyte |NN SV *sv
Amdb |STRLEN |sv_utf8_upgrade|NN SV *sv
+Amd |STRLEN |sv_utf8_upgrade_nomg|NN SV *sv
ApdM |bool |sv_utf8_downgrade|NN SV *const sv|const bool fail_ok
Apd |void |sv_utf8_encode |NN SV *const sv
ApdM |bool |sv_utf8_decode |NN SV *const sv