Well, I don’t know your use case well enough, but I guess you might have perfect reason for that behavior.

One thing that comes to my mind is the old Try in C#

bool parsedSuccessfully = int.TryParse("123", out int result);

But I guess more popular approach would be to use Error as Values, right?

E.g. something like this

Outcome<Exception, Int> result = int.TotallyNewParse("123");