keycmp
hash->keycmp = hash->case_sensitive ? _ht_strcmp : _ht_lower_strcmp;
node && hash->keycmp(node->symbol.name, name)!=0;
int (*keycmp)(const char *, const char *); /* Key comparison function */
int (*keycmp)(mod_hash_key_t, mod_hash_key_t), /* key comparator */
ASSERT(hname && keycmp && hash_alg && vdtor && kdtor);
mod_hash->mh_keycmp = keycmp;