Added warning logs for invalid data during mutator validation, refined field validation logic to handle undefined values, and adjusted event validation comments for clarity. Minor improvements include exporting events from core and handling optional chaining in entity field validation.
Added support for validating and managing return values in events. Implemented `validate` and `clone` methods in the event base class for event mutation and return handling. Additionally, enhanced error handling, introduced "once" listeners, and improved async execution management in the `EventManager`.
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