hash_64
return hash_64(chash_iter_key64(iter), iter.table->bits);
hash_64(chash_iter_key64(iter), iter.table->bits);
hash_32(key, table->bits) : hash_64(key, table->bits);
hash_32(key, table->bits) : hash_64(key, table->bits);
#define hash_long(val, bits) hash_64(val, bits)