RAC(model, actionVisible) = [RACSignal combineLatest:@[RACObserve(self, actionVisibilityCounterProvider),
                                                            RACObserve(self, action)]
                                                  reduce:^NSNumber *(id <OKCounterProvider> counterProvider, id <OKAction> action) {
                                                      BOOL visible = counterProvider.count > 0;
                                                      visible |= (action != nil && counterProvider == nil);
                                                                return @(visible);
    }];