fix: add send object serialization support (#122) #123
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Fixes the serialization issue with langgraph.types.Send objects reported in issue #94. Previously, Send objects were not being correctly serialized and deserialized, which caused them to be returned as plain dictionaries after a roundtrip. This led to `isinstance(packet, Send)` checks failing in LangGraph's `prepare_single_task` function, resulting in tasks not being added when handling interrupts. Changes: - Added Send object serialization in JsonPlusRedisSerializer._default_handler with a `__send__` type marker (similar to Interrupt handling) - Added Send object preprocessing in _preprocess_interrupts method - Added Send object deserialization in _revive_if_needed method - Added Send object deserialization in base.py's _recursive_deserialize method - Added comprehensive test suite (tests/test_send_serialization.py) with 6 tests covering various Send object scenarios The fix ensures that Send objects maintain their type identity throughout the serialization/deserialization cycle, allowing interrupt handling to work correctly. Resolves: #94
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