TaskStarted

def __init__(self, **kwargs: Any) -> None:
    # Apply defaults first, then user-provided kwargs so that
    # property setters (e.g. content -> _content) aren't overwritten
    # by a field default applied afterwards.
    defaults: dict[str, Any] = {}
    for klass in reversed(type(self).__mro__):
        for name, f in getattr(klass, "_event_fields_", {}).items():
            if name not in kwargs:
                default = f.get_default()
                if default is not Ellipsis:
                    defaults[name] = default

    for key, value in defaults.items():
        setattr(self, key, value)
    for key, value in kwargs.items():
        setattr(self, key, value)