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There a stupid bug - after you vote, the arrow is hidden, but it will accept clicks :-) So you can continue to upvote many times, and the score text updates. When you refresh, the actual vote is restored.

Tested with Safari 419.3.

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I don't think I count this as a bug. If you do something stupid, you see something stupid, but it doesn't affect anyone else.

It's not a harmful bug, but it's certainly not behavior users will appreciate. I could imagine a new user not understanding the one man, one vote property of the system, then being confused later when the votes seem not to have gone through.

Adding the visual effect of idempotency on the frontend is probably a two-second fix, anyway.

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