docs: def ensure_indirect_subclass(class_, of):
      """Check whether given is an indirect subclass of another,
      i.e. there exists at least intermediate base between ``of`` and ``class_``.
  
      :param class_: Class to check
      :param of: Superclass to check against
  
      :return: ``class_``, if the check succeeds
      :raise TypeError: When the check fails
  
      .. versionadded:: 0.0.4
      """
      if not is_indirect_subclass(class_, of):
          raise TypeError(
              "expected an indirect subclass of %r, got %s instead" % (
                  of, class_.__name__))
      return class_