Apd |bool |hv_exists |HV* tb|const char* key|I32 klen
Apd |bool |hv_exists_ent |HV* tb|SV* key|U32 hash
Apd |SV** |hv_fetch |HV* tb|const char* key|I32 klen|I32 lval
-ApMd |SV** |hv_fetch_flags |HV* tb|const char* key|I32 klen|I32 lval|I32 flags
Apd |HE* |hv_fetch_ent |HV* tb|SV* key|I32 lval|U32 hash
Ap |void |hv_free_ent |HV* hv|HE* entry
Apd |I32 |hv_iterinit |HV* tb