Wordpress wp_options VARCHAR increase.

gistfile1.txt

mysql> CREATE TABLE `wp_options` (
    ->   `option_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
    ->   `option_name` varchar(64) NOT NULL DEFAULT '',
    ->   `option_value` longtext NOT NULL,
    ->   `autoload` varchar(20) NOT NULL DEFAULT 'yes',
    ->   PRIMARY KEY (`option_id`),
    ->   UNIQUE KEY `option_name` (`option_name`)
    -> ) ENGINE=InnoDB AUTO_INCREMENT=43361 DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.02 sec)

mysql> INSERT INTO wp_options SELECT NULL, uuid(), REPEAT('a', 200), 'yes' FROM dual;
Query OK, 1 row affected (0.00 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> INSERT INTO wp_options SELECT NULL, uuid(), REPEAT('a', 200), 'yes' FROM wp_options a, wp_options b, wp_options c, wp_options d;
Query OK, 1 row affected (0.00 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> INSERT INTO wp_options SELECT NULL, uuid(), REPEAT('a', 200), 'yes' FROM wp_options a, wp_options b, wp_options c, wp_options d;
Query OK, 16 rows affected (0.01 sec)
Records: 16  Duplicates: 0  Warnings: 0

mysql> INSERT INTO wp_options SELECT NULL, uuid(), REPEAT('a', 200), 'yes' FROM wp_options a, wp_options b, wp_options c, wp_options d;
Query OK, 104976 rows affected (2.07 sec)
Records: 104976  Duplicates: 0  Warnings: 0

mysql> select count(*) from wp_options;
+----------+
| count(*) |
+----------+
|   104994 |
+----------+
1 row in set (0.04 sec)

mysql> ALTER TABLE wp_options CHANGE option_name option_name VARCHAR(255) NOT NULL;
Query OK, 104994 rows affected (1.71 sec)
Records: 104994  Duplicates: 0  Warnings: 0

mysql> ALTER TABLE wp_options ENGINE=MyISAM;
ALQuery OK, 104994 rows affected (3.14 sec)
Records: 104994  Duplicates: 0  Warnings: 0

mysql> ALTER TABLE wp_options CHANGE option_name option_name VARCHAR(64) NOT NULL;
Query OK, 104994 rows affected (1.58 sec)
Records: 104994  Duplicates: 0  Warnings: 0

mysql> ALTER TABLE wp_options CHANGE option_name option_name VARCHAR(255) NOT NULL;
Query OK, 104994 rows affected (2.84 sec)
Records: 104994  Duplicates: 0  Warnings: 0