+PERL_CALLCONV void Perl_sv_setsv_flags(pTHX_ SV* dsv, SV* ssv, I32 flags);
+PERL_CALLCONV void Perl_sv_catpvn_flags(pTHX_ SV* sv, const char* ptr, STRLEN len, I32 flags);
+PERL_CALLCONV void Perl_sv_catsv_flags(pTHX_ SV* dsv, SV* ssv, I32 flags);
+PERL_CALLCONV STRLEN Perl_sv_utf8_upgrade_flags(pTHX_ SV *sv, I32 flags);
+PERL_CALLCONV char* Perl_sv_pvn_force_flags(pTHX_ SV* sv, STRLEN* lp, I32 flags);
+PERL_CALLCONV char* Perl_sv_2pv_flags(pTHX_ SV* sv, STRLEN* lp, I32 flags);
+PERL_CALLCONV char* Perl_my_atof2(pTHX_ const char *s, NV* value);