This is a genuine question, is there an HN guideline that says not to upvote reposts? I don't know if I knew about HN four years ago and if I did, I almost cer

This is a genuine question, is there an HN guideline that says not to upvote reposts? I don't know if I knew about HN four years ago and if I did, I almost certainly missed that post, and if I didn't, I certainly don't remember the interesting discussion in the comments. I enjoyed the article and I'm not sure I see a reason not to upvote it.