regex question clearly demonstrates that what happened doesn't always happen. So it is quite unlikely to be a feature.
I think it would be at least misleading to state "there is a bug that responds to attempts to post with an existing title by just displaying the node with the prior title" (as regex question is not the only counter example -- just prepend "Re: " to the front of any of thousands of root node titles to find more counter examples).
I find it most likely that there is a combination of multiple bugs and system configuration/performance problems that appear to be able to combine (at least once) to cause the behavior you observed.
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I was aware of duplicates in SoPW. But it could have been a feature only enabled for root node titles in Meditiations.
But ok, it was a bug. Someone with the ability to delete nodes could try to post a root node with the title 'to perl or not to PERL' in Meditations and see if the bug is reproducible. I would have done it myself, but then silly test nodes might clutter the Meditation section if I succeed with the posting, also without access to logfiles there would have been not much to gain from my experiments
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It might be a badly implemented feature combined with a misconfiguration. I was a bit shocked to find the misconfiguration but I changed it.
Did you try posting more than once before you resorted to changing the title? Being able to reproduce the problem is an important part of diagnosis and should be noted when reporting a problem.
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