Retry: Retry If Retruned Object Meets a Condition

Hi,

I'd like to retry if the returned object meets a condition.

Example:

```dart
      final response = await retry(
      // Make a GET request
      () => http.get('https://google.com'),
      // Retry on Exception
      retryIf: (e) => e is SocketException,
      retryIfReturnedObject: (o) => o == "retry-please"
  );
```
is this possible?
Thanks