I remember reading another interesting article about the widening rules in C / C++ and one of the recommendations was that you could always widen when comparing

I remember reading another interesting article about the widening rules in C / C++ and one of the recommendations was that you could always widen when comparing small apples to medium apples. You'd both widen them to large apples. But not for the 128 one. There is no larger one. If anybody finds the article... I think it's applicable here on the xisdigit example.