\set ECHO none
psql:sql/bignum.sql:31: NOTICE:  return type bignum is only a shell
psql:sql/bignum.sql:36: NOTICE:  argument type bignum is only a shell
SELECT bignum('0'), bignum('1'), bignum('-1');
 bignum | bignum | bignum 
--------+--------+--------
 0      | 1      | -1
(1 row)

SELECT 0::bignum, 1::bignum, (-1)::bignum;
 bignum | bignum | bignum 
--------+--------+--------
 0      | 1      | -1
(1 row)

SELECT (1::int8)::bignum, (-1::int8)::bignum;
 bignum | bignum 
--------+--------
 1      | -1
(1 row)

ROLLBACK;