I didn't refute that sprintf acts the way it does. I just think it's numerically wrong to "round" a number down if it's in the upper half of an intra-integer span. Half the numbers in [N,N+1) should go up, half the numbers down. Rounding everyday numbers should not be as complex as deciding when to add a leap-second the clock.

If you're a mathematician, you should know that you shouldn't leave numbers to the whims of crappy implementations in runtime libraries: calculate what you want in your own code, and understand the limitations of the hardware you're using.

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