For internal spidr use only.
data APInt : Type
MkAPInt : GCAnyPtr -> APInt
getMaxValue : HasIO io => Bits16 -> io APInt
getSignedMaxValue : HasIO io => Bits16 -> io APInt
getMinValue : HasIO io => Bits16 -> io APInt
getSignedMinValue : HasIO io => Bits16 -> io APInt