if the whole string is the same in UTF-8 as not.
Returns the number of bytes in the converted string
-This is not as a general purpose byte encoding to Unicode interface:
+This is not a general purpose byte encoding to Unicode interface:
use the Encode extension for that.
=for apidoc sv_utf8_upgrade_nomg
C<sv_utf8_upgrade> and
C<sv_utf8_upgrade_nomg> are implemented in terms of this function.
-This is not as a general purpose byte encoding to Unicode interface:
+This is not a general purpose byte encoding to Unicode interface:
use the Encode extension for that.
=cut
in this case, either returns false or, if C<fail_ok> is not
true, croaks.
-This is not as a general purpose Unicode to byte encoding interface:
+This is not a general purpose Unicode to byte encoding interface:
use the Encode extension for that.
=cut