PERL_CALLCONV char* Perl_sv_pvutf8n_force(pTHX_ SV* sv, STRLEN* lp);
PERL_CALLCONV char* Perl_sv_pvbyten_force(pTHX_ SV* sv, STRLEN* lp);
PERL_CALLCONV char* Perl_sv_recode_to_utf8(pTHX_ SV* sv, SV *encoding);
+PERL_CALLCONV bool Perl_sv_cat_decode(pTHX_ SV* dsv, SV *encoding, SV *ssv, int *offset, char* tstr, int tlen);
PERL_CALLCONV char* Perl_sv_reftype(pTHX_ SV* sv, int ob);
PERL_CALLCONV void Perl_sv_replace(pTHX_ SV* sv, SV* nsv);
PERL_CALLCONV void Perl_sv_report_used(pTHX);