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Notice the comments in this answer for Combinatorial proof that binomial coefficients are given by alternating sums of squares? Two of the comments begin with the funny-looking string "š:". The author of the answer is Luboš Motl.

What I think happened is that the comments originally began "@Luboš:", before the new feature was introduced to automatically remove @user alerts to the author, but apparently that feature got confused when faced with the "š" in "Luboš".

I assume this is a bug.

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This is an issue with the one-time historical fixup we ran, not the current removal code.

I'll check elsewhere for instances of this, but it should be rare; just flag them for moderator attention any site you seem them on.

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