This is cool.
How long does a thread have to get before this kicks in?
What about listing the two most recent pages, i.e. (1 ... 31 32)? That way you can start with the second-to-last if the new page has just been started and there are still posts on the previous one that you haven't seen. Am I making sense?
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The what mentioned above is total fiction. Please don't take it seriously!