A clear example of how the game allows for intermediate rounding in its calculations: an expert Necromancer kills a Fairy – instead of getting 10 skeletons from 72, he gets 9. The number of Fairies is divided by the number of stacks, divided by 6/3=2, multiplied by 0.3, and then multiplied by the number of stacks. This results in two potentially fractional results with rounding, and since the numbers themselves are small, the error can be significant. If anyone is interested, please check if the fractional part is discarded at each stage? Because my editor is glitching).
It seems the same thing happens with the Armorer).