"Non-negative" unsigneds can be validly cast to smaller types. That's why saturating_cast() exists. There are modular numbers where casting to a smaller value i

"Non-negative" unsigneds can be validly cast to smaller types. That's why saturating_cast() exists. There are modular numbers where casting to a smaller value is likewise unsafe at a logical level. Your LCRNG won't give you the right period when downcast, even if the modulus value is unchanged.