How do multiple Answers in a post get Accepted?

What situations allow multiple Answers in a thread (less than a week old) to get Accept-clicked, as seems to have occurred here:

http://www.mathworks.com/matlabcentral/answers/57092-finding-a-noninteger-value-from-an-array

[Walter Roberson]

Neat, I've never seen that before.

I thought perhaps if one had two copies of the question open, but I just tried that and it did not produce this behavior.

[Randy Souza]

Hmm. I'll look into that. My best guess is that the request to accept the first answer hung or took an abnormally long time to load, and in the interim the asker clicked accept for the other answer. It's a bug.

[Randy Souza]

I'm going to set Matt's answer as the accepted one, because: (1) it was posted earlier (by two whole minutes), (2) according to the database it was accepted earlier, and (3) because the answer code is the same.

However, Kye keeps the 4 reputation points earned for an accepted answer.

[Kye Taylor]

We should both get the points for our rep, and extra points for finding the bug!

[Matt J]

@Kye - if you convert your comment to an Answer, I'll upvote it and you will get extra points! You can do the same for me by upvoting the question ;)

Answer 1

[Matt J]

Just closing this.

Answer 2

[Kye Taylor]

Hahaha thanks @Matt J...

Extra +1 to us for stumbling on the bug!

Answer 3

[Image Analyst]

I wonder is Randy is experimenting with the ability to "Unanswer" a question and mark the better one as the "Answer" - something a lot of people have been asking for for a long time, though I suspect he tries this stuff out first on a sandbox, non-production copy of the database rather than the production one.

[Randy Souza]

No, we're still considering the accept-a-different-answer use case, but haven't started on the random experimentation yet :-)

[Image Analyst]

It looks like multiple answers can now be done. Have you added that capability? For example I saw it in this posting. Though only one of the "Answerers" is listed on the main topic view.