Library breaks with float feeRate

[Distance71]

Float fee rates are not something uncommon. Something like 0.1, 100.2, ...

On the other hand, If We check uintOrNaN, float fee rates are not handled by the library

As much as I could see, it can be easily fixed by removing that line on utils uintOrNaN, setting Math.round() on both accumulative and blackjack, and finalize