You could (just use an interface). However, it would be a pain to use because Go doesn't have generics (if a type X implements the Maybe interface, it is not tr

You could (just use an interface). However, it would be a pain to use because Go doesn't have generics (if a type X implements the Maybe interface, it is not true that []X can be casted to []Maybe). So you would have to always make temporary slices to copy all of your Xs into.