sR |SV* |swatch_get |NN SV* swash|UV start|UV span
#endif
+AiMn |void |append_utf8_from_native_byte|const U8 byte|NN U8** dest
+
Apd |void |sv_setsv_flags |NN SV *dstr|NULLOK SV *sstr|const I32 flags
Apd |void |sv_catpvn_flags|NN SV *const dstr|NN const char *sstr|const STRLEN len \
|const I32 flags