This function is undocumented, and is for internal core use only. Cause
it to not be mentioned in perlapi
ApR |bool |is_utf8_alnum |NN const U8 *p
ApR |bool |is_utf8_idfirst|NN const U8 *p
ApR |bool |is_utf8_xidfirst|NN const U8 *p
-ApR |bool |_is_utf8__perl_idstart|NN const U8 *p
+AMpR |bool |_is_utf8__perl_idstart|NN const U8 *p
ApR |bool |is_utf8_idcont |NN const U8 *p
ApR |bool |is_utf8_xidcont |NN const U8 *p
ApR |bool |is_utf8_alpha |NN const U8 *p