Trying to downvote: Set url to dir=dn - cannot make that vote. Lol. dir=down - nothing appears to happen. Hrm. Was it down was right, but ignored, and dn was

Trying to downvote: Set url to dir=dn - cannot make that vote. Lol. dir=down - nothing appears to happen. Hrm. Was it down was right, but ignored, and dn was not in the set, or dn was in the set, and errored because not allowed?