You should use this I<after> a call to SvPV() or one of its variants, in
case any call to string overloading updates the internal flag.
+If you want to take into account the L<bytes> pragma, use C<L</DO_UTF8>>
+instead.
+
=for apidoc Am|void|SvUTF8_on|SV *sv
Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
Do not use frivolously.
The pointer to the PV of the C<dsv> is returned.
+See also L</sv_uni_display>.
+
=cut */
char *
Perl_pv_uni_display(pTHX_ SV *dsv, const U8 *spv, STRLEN len, STRLEN pvlim, UV flags)