fix: serialize typing classes assigned to fields

[lokmeinmatz]

We had a case where a function input used an lru_cache as attribute, not as a decorator, and lru_cache somewhere internally stores the return type of the function... and typing.Sequence for example has an attribute slots but that is None, so the serialization failed every time.

If someone has a better idea how to catch that or what types should be serialized to, I'd be glad to get input :)

Thanks!

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[!IMPORTANT] Fix serialization of typing classes with __slots__ in EventSerializer and add corresponding test.

• Behavior:
  • In serializer.py, EventSerializer.default() now checks if obj is a type or a generic alias and serializes it as "<obj.__name__>".
  • Handles cases where __slots__ is None to prevent serialization failures.
• Tests:
  • Adds test_slots_types() in test_serializer.py to verify serialization of typing classes assigned to fields.

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[hassiebp]

Thanks again for raising this! Closing this as stale / no longer relevant in Python SDK v3. If you continue to see issues, please open a Github issue 👍🏾