rok::core::num::ints
rok::core::num::ints: the integer primitives' methods and limits
(stdlib 2.1.4): bit operations, byte order, and the checked_ /
wrapping_ / saturating_ / overflowing_ families that spell out
what plain + - * leave to the profile (2.3).
wrapping_add / _sub / _mul and the bit counts are intrinsics;
the rest is built on them. One regular block per type.
The limits are MIN / MAX consts rather than 2.1.4's fn min() /
fn max(), which would shadow Ord::min(self, rhs).