Will Miao 84e708328b fix: correct return_types propagation to GenericNodeExtractor ...

Two bugs prevented type-signature-based fallback from working:

- metadata_hook.py used getattr(obj.__class__, 'RETURN_TYPES')
  which fails when _async_map_node_over_list is called with
  a class (not instance) — obj.__class__ is the metaclass
  'type', which has no RETURN_TYPES. Fixed: getattr(obj, ...).

- metadata_registry.py used type(extractor) is GenericNodeExtractor
  to dispatch return_types. NODE_EXTRACTORS stores class
  references, not instances; type(Class) is always 'type',
  never the class. Fixed: extractor is GenericNodeExtractor.

2026-07-26 10:34:20 +08:00

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