Provide an annotation to support automatic discarding of the persistent fields after a component or page method invocation

It would be nice to have an annotation, @DiscardAfter, that could be placed on a handler method of page or a component .

public class Login {
@Persist
private String username;

@Persist
private String password;

@DiscardAfter
void onSuccess()

...
}

A ComponentClassTransformWorker could recognize the methods with such annotations, and call ComponentResources#discardPersistentFieldChanges().