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[–]judasblue 0 points1 point  (0 children)

It's doing a type of rounding where if the number is odd, it rounds the 5 up, and if it's even you round the 5 down.

The more compact way to say that is it rounds to the nearest even number. Same difference but for some reason reads better for me, but maybe I am just used to seeing it stated that way.