docs: def map_or(self, callback: Callable[[T], U], default: A) -> Union[U, A]:
          """
          Applies the ``callback`` to the contained value or returns ``default``.
  
          Args:
              callback: The callback to apply to the contained value.
              default: The default value.
  
          Returns:
              The ``callback`` result if the contained value is ``Some``,
              otherwise ``default``.
  
          Notes:
              If you wish to use the result of a function call as ``default``,
              it is recommended to use :py:meth:`map_or_else` instead.
  
          Examples:
              >>> Some(0).map_or(lambda x: x + 1, 1000)
              1
              >>> NONE.map_or(lambda x: x * x, 1)
              1
          """
          return callback(self._val) if self._is_some else default