docs: def is_scalar(self, typ: Type = _Any) -> bool:
          """Returns True iff this represents a scalar node.
  
          If a type is given, checks that the ScalarNode represents this \
          type. Type may be `str`, `int`, `float`, `bool`, or `None`.
  
          If no type is given, any ScalarNode will return True.
          """
          if isinstance(self.yaml_node, yaml.ScalarNode):
              if typ != _Any and typ in scalar_type_to_tag:
                  if typ is None:
                      typ = type(None)
                  return self.yaml_node.tag == scalar_type_to_tag[typ]
  
              if typ is _Any:
                  return True
              raise ValueError('Invalid scalar type passed to is_scalar()')
          return False