MySQL INT(x) is useless

gistfile1.sql

mysql> show create table testing;
+---------+----------------------------------------------------------------------------------------------+
| Table   | Create Table                                                                                 |
+---------+----------------------------------------------------------------------------------------------+
| testing | CREATE TABLE `testing` (
  `foobar` int(1) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+---------+----------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> insert into testing ( foobar ) values ( 99999999 );
Query OK, 1 row affected (0.01 sec)

mysql> select * from testing;
+----------+
| foobar   |
+----------+
| 99999999 |
+----------+