When i was using custom fields, the Unique option didn't work. After searching some files, I got to /user/profile/lib.php , which defines custom fields class.
There is a function
which is supposed to return that field from the database.
I thought correcting the mispelling of $this would fix the error. But i found something even stranger.
There isn't any file using this function.
Is the unique code done? Or left TODO?