Possible slight optimization for "pow"

[PaulRBerg]

Would it reduce the gas if I checked y/z is a whole number and call PRBMath.powu in that case?

[PaulRBerg]

It might reduce the gas cost for those cases when y/z is a whole number, but there should be fewer cases like that compared to cases when y/z is a fixed-point number. Users know what the exponent is in advance, so they can just choose to call powu instead. No need to make the fixed-point path more expensive.