* Most of the $userdata array fields have filters associated with the values.
* The exceptions are 'rich_editing', 'role', 'jabber', 'aim', 'yim',
* 'user_registered', and 'ID'. The filters have the prefix 'pre_user_' followed
* Most of the $userdata array fields have filters associated with the values.
* The exceptions are 'rich_editing', 'role', 'jabber', 'aim', 'yim',
* 'user_registered', and 'ID'. The filters have the prefix 'pre_user_' followed