>>> maybe(Maybe()).log
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'Maybe' object has no attribute 'log'

@overload
def maybe(value: Maybe) -> Maybe:   # But such code can also be broken if `Maybe` is a child element of object
    ...  
@overload
def maybe(value: None) -> Nothing:
    ...
@overload
def maybe(value) -> Something:
    ...

if isinstance(value, Maybe):
   return value