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The following question has two accepted answers. It appears that the one with fewer votes somehow became undeleted.

http://stackoverflow.com/questions/72394/what-should-a-developer-know-before-building-a-public-web-site

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closed as too localized by Hugo Dozois, Lucifer, ɥʇǝS, hims056, ben is uǝq backwards Jun 7 '13 at 7:50

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Well, with +1200 votes, that's the community accepting the vote, right? I'm sure this feature has been requested before, didn't recall it being implemented though. –  Oded Feb 6 '13 at 21:21
    
@Oded No, this is a likely just a migration edge case. The question was migrated away to ProgSE, then the migration was rejected and it got bumped back. I believe accepted answers are preserved, so it ended up with two. –  Anna Lear Feb 6 '13 at 21:25
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@AnnaLear - Guess I should be clearer when joking, now that I have a ♦... –  Oded Feb 6 '13 at 21:26
    
@Oded Nah, it's funnier if people have to wonder. ;) –  Anna Lear Feb 6 '13 at 21:26
    
They have these things called emoticons. There's also end tags, such as </kidding>, </irony> and </snark> that can be used. –  Robert Harvey Feb 6 '13 at 21:28
    
I see what you did there, @RobertHarvey –  Oded Feb 6 '13 at 21:30
    
Well, the question itself is currently unlocked and open on Programmers. Seems like an issue. I thought this wasn't supposed to happen. One of them should be deleted. –  animuson Feb 6 '13 at 21:30
    
Heh. Migration was rejected 1 year and 5 months after migration. –  Oded Feb 6 '13 at 21:33
    
@animuson: Why? There's no such thing as a cross-site duplicate, and Programmers and SO have different site scopes. We could decide that the post should live on only one site, but note that the content is not identical between the two posts. –  Robert Harvey Feb 6 '13 at 21:33
    
@RobertHarvey Because you're providing the exact same question in two different places with two different versions of information. –  animuson Feb 6 '13 at 21:35
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@Oded: Perhaps the same migration rules should apply to rejections. Don't allow rejections to occur if the question has been migrated there for more than 60 days (or whatever the time period is). –  animuson Feb 6 '13 at 21:36
    
@animuson: Well, my vote is for deletion of the original on SO, but you're going to break a bunch of Internet links, and we should probably wait until the problem is fixed anyway. –  Robert Harvey Feb 6 '13 at 21:36
    
Sounds reasonable, @animuson. The question was closed as not constructive on programmers, which is what triggered the migration rejection, if I read the timestamps correctly. –  Oded Feb 6 '13 at 21:38
    
FWIW, I tried to put together a query at data.stackexchange.com to detect other cases of this, but based upon the schema, two accepted-answers does not seem to be possible. I'm guessing that dupe-accepted-answers occur in a caching layer and that the fix probably involves invalidating the cache for the question & answers. –  user133440 Feb 7 '13 at 15:04