dispose method
Implementation
Future<void> dispose() async {
for (var s in _subs) await s.cancel();
await _streamController.close();
log('firestore_collection: $hashCode. disposed.');
}
Future<void> dispose() async {
for (var s in _subs) await s.cancel();
await _streamController.close();
log('firestore_collection: $hashCode. disposed.');
}