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5y
In the original system, your UPVOTE bar could be used up by UPVOTING (OR) by DOWNVOTING.
You could choose to DOWNVOTE but that would reduce your total available UPVOTE.
After HF21, a FREE DOWNVOTE bar was added, so you could DOWNVOTE with NO PENALTY.
RE: Although subjectively downvoting posts to zero is anathema to me, the Layer 1 ability to do so must remain (for now at least)