PERL_CALLCONV bool Perl_hv_exists(pTHX_ HV* tb, const char* key, I32 klen);
PERL_CALLCONV bool Perl_hv_exists_ent(pTHX_ HV* tb, SV* key, U32 hash);
PERL_CALLCONV SV** Perl_hv_fetch(pTHX_ HV* tb, const char* key, I32 klen, I32 lval);
+PERL_CALLCONV SV** Perl_hv_fetch_flags(pTHX_ HV* tb, const char* key, I32 klen, I32 lval, I32 flags);
PERL_CALLCONV HE* Perl_hv_fetch_ent(pTHX_ HV* tb, SV* key, I32 lval, U32 hash);
PERL_CALLCONV void Perl_hv_free_ent(pTHX_ HV* hv, HE* entry);
PERL_CALLCONV I32 Perl_hv_iterinit(pTHX_ HV* tb);