Flow is not released when embedded in UINavigationController

[mashe]

Lets say there is a Flow that is can be presented modally as well as pushed to the navigational stack:

final class ExampleFlow: Flow {
    let root: Presentable
    
    init() {
        let viewModel = ExampleModel()
        let viewController = ExampleController(viewModel: viewModel)
        self.root = viewController
    }

}

And it is possible navigate by pushing:

private func navigateToRecoveryCode() -> FlowContributors {
        let flow = ExampleFlow()
        Flows.use(flow, when: .created) { (root) in
            rootNavigationController.pushViewController(viewController, animated: true)
        }
        return .one(
            flowContributor: .contribute(
                withNextPresentable: flow,
                withNextStepper: DefaultStepper()
            )
        )
    }
}

or by presenting modally:

private func navigateToRecoveryCode() -> FlowContributors {
        let navigationController = navigationController()
        let flow = ExampleFlow()
        Flows.use(flow, when: .created) { (root) in
            navigationController.viewControllers = [root]
            rootNavigationController.present(navigationController, animated: true)
        }
        return .one(
            flowContributor: .contribute(
                withNextPresentable: flow,
                withNextStepper: DefaultStepper()
            )
        )
    }
}

The problem comes from the idea that ExampleFlow.root.rxDismissed always emits an event on dismiss.
However, it never emits an event when root is embedded in UINavigationContoller.
Instead UINavigationController.rxDismissed emits an event.
The Flow design [proposed above] does not know anything about UINavigationController and I think it should be kept as it.

So my proposal is to update rxDismissed in a such way that it emits an event when parent navigation controller is dismissed.