Extracting new value of a BindingAction

[ferologics]

Hi, I am experimenting with new bindings and I'm wondering how to extract the new value from binding action used in following way:

NavigationLink(
  isActive: viewStore.binding(\.$isNavActive)
) {
  EmptyView()
} label: {
  Text("Navigate")
    .padding()
}

[...]

let reducer = Reducer<State, Action, Void> { state, action, _ in
  switch action {
  case .binding(\.$isNavActive):
    print(state.isNavActive) // prints false on tap
    return .none
  case .binding(_):
    return .none
  }
}

Expectation

The value of isNavActive binding is set to true on NavigationLink tap

Actual result

The value of isNavActive binding is set to false on NavigationLink tap

What's the proper syntax for extracting new value for case .binding(\.$isNavActive): ? I couldn't find it anywhere in documentation / examples. I tried case .binding(.set(\.$isNavActive, let isActive)): but the compiler didn't like that very much.

I expect there to be a new value for the action, because when I log from case let .binding(action) the debugger prints:

BindingAction<State>(keyPath: Swift.WritableKeyPath<BindingNavigation.State, ComposableArchitecture.BindableState<Swift.Bool>>, set: (Function), value: true, valueIsEqualTo: (Function))

[ferologics]

Oh I forgot about the a .binding() suffix on the reducer.