This reminds me a bit of a recent publication by Stroustrup about using concepts... in C++ to validate integer conversions automatically where necessary.

https://www.stroustrup.com/Concept-based-GP.pdf

  {
     Number<unsigned int> ii = 0;
     Number<char> cc = '0';
     ii = 2; // OK
     ii = -2; // throws
     cc = i; // OK if i is within cc’s range
     cc = -17; // OK if char is signed; otherwise throws
     cc = 1234; // throws if a char is 8 bits
  }