User laziness at the best: I was browsing one question here on worldbuilding on my mobile device. As I scroll, I accidentally put my finger on "downvote" arrow, causing vote down on one of provided answers.
Normally, I do cast upvote instead, but in some cases I would like just to leave answer/question as it was (effective zero vote).
I know, it is just internet points, but sometimes I do this on question or answer I believe does not deserve downvote, but I think it also does not deserve upvote.
Is there mechanic to "null" my vote on question or answer?