-- BigInt precedures
-- a BigInt that will work on BigInt
CREATE OR REPLACE FUNCTION bigint_graceful1(val BIGINT)
   RETURNS BIGINT AS $$
    return val - 1n;
   $$ LANGUAGE plv8 STABLE STRICT;
SELECT bigint_graceful1(9223372036854775807);
  bigint_graceful1   
---------------------
 9223372036854775806
(1 row)

-- this will fail
SELECT bigint_graceful1(32);
ERROR:  TypeError: Cannot mix BigInt and other types, use explicit conversions
CONTEXT:  bigint_graceful1() LINE 2:     return val - 1n;
-- a BigInt that will fail on BigInt
CREATE OR REPLACE FUNCTION bigint_graceful2(val BIGINT)
   RETURNS BIGINT AS $$
    return val - 1;
   $$ LANGUAGE plv8 STABLE STRICT;
SELECT bigint_graceful2(32);
 bigint_graceful2 
------------------
               31
(1 row)

-- this will fail
SELECT bigint_graceful2(9223372036854775807);
ERROR:  TypeError: Cannot mix BigInt and other types, use explicit conversions
CONTEXT:  bigint_graceful2() LINE 2:     return val - 1;