Like, now we mark one whole forum read at a time. I thought I saw *a single post* within a forum[*] lose its LRPD. How would that work; where would these per-post timestamps be saved?

That's what I meant by "within the current parameters", or whatever words to roughly that effect I used.

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[*]: OK, so that was also "all posts" that were previously unread in that forum, since the one I was replying to was the only unread one I had in the forum. But had there been more than one, it couldn't have worked within the current "mark-entire-forums" concept at all, AFAICS.