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The reason for an upvote is pretty obvious. The upvoted author usually explained his point.
But what is the meaning for a downvote? This info could be very valuable.
For example, today I posted this:
https://news.ycombinator.com/item?id=11361031
What do I learn from the downvotes it got? That my post was too unfriendly? That the facts are wrong? That people disagree in some other way?
I would really like to know.