I've noticed that duplicate links are sometimes permitted to be submitted and posted within a short window, e.g.:
https://news.ycombinator.com/item?id=43507811
I thought duplicate URLs were rejected and the existing link simply upvoted? It appears to not be the case. How is this possible?
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Comments URL: https://news.ycombinator.com/item?id=43526461
Points: 2
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