"Normal rounding" is a misleading term. As far as I know (and I can't be bothered to look it up) sprintf rounding uses whatever rounding libc uses, which tends but isn't guaranteed to be " banker's rounding". Banker's rounding, or HALF_EVEN in Java parlance*, is useful because it tends to lead to less distortion over large sums while still being predictable.
* HALF_EVEN is also the strategy Java uses for float and double maths.
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