def as_dict(self) -> dict[str, object]:
"""Return self as (json.dumps-coompatible) dict."""
d = super().as_dict
- d['todos'] = [t.as_dict for t in self.todos]
+ assert isinstance(d['_library'], dict)
+ d['todos'] = [t.as_dict_into_reference(d['_library'])
+ for t in self.todos]
return d
@classmethod