> However, I don't see anything but the participle used in a variable name, where you can't buld the proposition where the simple past would, indeed, make sense. That being said, showed is an alternative (albeit dated) form of the participle, so I suggest we table this and leave the variable as is. If only because there's a chance it will edify future grammar nazi readers.

LOL. I don't mind changing this, but I did wanted to understand if and why it was wrong. I gather both forms are correct, with 'shown' being more "in vogue" than 'showed'.