Over in the Perl tagged questions, we seem to have a much smaller group of people who are asking questions, and a small but regular group of folks answering them. We've been pretty good at catching, marking, and closing duplicates (I think, anyway.) I figured this was pretty much SOP for the rest of SO.
Then I saw a couple questions today:
The first answer explains the solution, and then as part of the answer, links to another SO question that answers the exact same question. For something like closures, sure, this might be more difficult to look up, but the one that really got me was this one:
Asking how to convert a string to a DateTime. In fact, in a cursory search of SO, using the exact text in the title, I came up with plenty of pages of questions. Slight variations of the question came up with many more answers, all either almost close or exact duplicates to it. In fact, this question was considered so "popular" by a few of the commentators that this was one of their "Once a month" questions (with the author then replying that he was compiling a list of once-a-month'ers.)
Not only does the author acknowledge that this was a duplicate, but he posted it anyway!? And on top of that, no one else bothered looking for duplicates?
(And just to avoid hypocrisy, I went through as many of the exact-duplicate tagged questions as I could to find one similar ones to this, and the closest I could get was this one about covariance. One might consider this question a general case of that one.
There was at least One Discussion about rewarding the finding of duplicates on meta before, but it looks like either the outcome of that discussion is either uncertain or still under discussion. )
Is leaving duplicates really the status-quo for questions in other parts of SO? Is it tolerated? Or is it just acceptable?