The incorrect result of the WHERE condition that contains a negative integer boundary value.

mysql> DROP TABLE IF EXISTS t0;

Query OK, 0 rows affected (0.00 sec)

mysql> CREATE TABLE `t0` (

    ->   `c0` tinyint NOT NULL,

    ->   KEY `ic2` (`c0`)

    -> );

Query OK, 0 rows affected (0.01 sec)

mysql> insert into t0 values (127),(-128);

Query OK, 2 rows affected (0.00 sec)

Records: 2  Duplicates: 0  Warnings: 0

mysql> SELECT c0 FROM t0 WHERE (c0 NOT IN (126, -129));

+-----+

| c0  |

+-----+

| 127 |

+-----+

1 row in set (0.00 sec)