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Whatever we do, I think the following points should be true in any case: Whenever you can give votes, you should be able to retract those votes. Be it because you didn't actually mean to vote ...
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#1: Initial revision
Whatever we do, I think the following points should be true in any case: * Whenever you can give votes, you should be able to retract those votes. Be it because you didn't actually mean to vote (and that's not a theoretical issue; this has actually happened to me, though not yet on Codidact), or be it because the post was changed and you think the new state of the post no longer deserves that vote. The latter reason also means that you should not lose the ability to retract votes as long as the post can be edited. Since closing doesn't prevent edits, it also should not prevent retractions. * Either you can both upvote and downvote, or neither. I think allowing only one direction gives an undue bias. So while this post does not conclusively answer the question, it reduces the complexity of the four detailed questions to the simple question: Should voting on closed questions be allowed or not?