Database enum('Y','N') and enum('YES','N') replaced with BOOLEAN

[J2000_ca]

In the linkcategories, links, options there are both enum('Y','N') and enum('YES','N') and in posts ping_status might be better served as a ​boolean.

[markjaquith]

This could break any plugins that access these directly...

[J2000_ca]

It will probably break all plugins that use add_option unless it is left acccepting yes and no for one version. What I would do is switch the database in 1.6 so anyone who directly has to change and make the method optionally use yes and no and then in 1.8 remove it.

[mdawaffe]

BOOLEAN was introduced in MySQL 4.1. WP only requires 3.23.

We could go to TINYINT, but I don't see any reason to. With these and markjaquith's above, I'm marking as wontfix. Reopen with further thoughts if necessary.