+ assert(s); assert(lenp); assert(is_utf8p)
+PERL_CALLCONV U8* Perl_bytes_from_utf8_loc(const U8 *s, STRLEN *lenp, bool *is_utf8p, const U8 ** first_unconverted);
+#define PERL_ARGS_ASSERT_BYTES_FROM_UTF8_LOC \
+ assert(s); assert(lenp); assert(is_utf8p)
+PERL_CALLCONV U8* Perl_bytes_to_utf8(pTHX_ const U8 *s, STRLEN *lenp);