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Eddie Hebert
7eb1d719ed
In support of source that emits a subclass of Event which defines some fields as properties instead of doubling the value in the `Event.__dict__` Use hasattr instead of the overridden __contains__ method of the Event class, so that when non-algorithm facing code checks for field existence, properties count. Intentionally not touching the `__contains__` in Event, to avoid changing, at the moment, any algo behavior that relies on the `__contains__` behavior's use of `__dict__`