onStop method
Called when the owning ZenithContainer or ZenithRef scope is disposed/reset.
Implementation
@override
Future<void> onStop() async {
final sub = _subscription;
final port = _receivePort;
final iso = _isolate;
_subscription = null;
_receivePort = null;
_isolate = null;
await sub?.cancel();
port?.close();
iso?.kill(priority: Isolate.immediate);
}