I thought about this more ... and I was wrong about the rounding, I think. It's rounding to the nearest 0.05 which, in this case would be 0.05 (7 is closer to 5 than 10).

EDIT: I think it's generally accepted that -0.18 would round to -0.20 mathematically. If it is rounding each step then that would explain the 0.00U, right?

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