v2.1.9

• improvement of callable checks

  # the parameter/return value is an unknown callable
  Callable[..., Any]

  # the callable will have no arguments and returns a string
  Callable[[], str]

  # the annotation needs to match the callable you want to allow
  # for multiple options use
  Union[
        Callable[[int, str, str], str], 
        Callable[[int, str, int], str]
       ]