It’s not necessarily only for exceptional scenarios, but instead it is an exception to the normal return of a value. The usage where the return is always by exc

It’s not necessarily only for exceptional scenarios, but instead it is an exception to the normal return of a value. The usage where the return is always by exception (as in the n-queens example) is itself an exception ;). I do think it’s useful to mark one (return) type as the primary/normal/good case and other types as secondary/auxiliary/error cases, and have the latter auto-escalate independently.