如何检查NavigationPath是否包含NSManagedObject值？

假设我们有两个非常基本的类：

• 名为Item的NSManagedObject类
• 以及一个名为Navigation的ObservableObject类来处理NavigationPath

final class Navigation: ObservableObject {
    @Published var path = NavigationPath()
}

当NavigationPath包含某个Item元素时，我希望禁用NavigationLink，如下例所示：

struct ContentView: View {
    @StateObject private var navigation = Navigation()
    
    @Environment(\.managedObjectContext) private var viewContext

    @FetchRequest(sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)], animation: .default)
    private var items: FetchedResults<Item>

    var body: some View {
        NavigationStack(path: $navigation.path) {
            List(items) { item in
                NavigationLink(value: item) {
                    Text("Item at \(item.timestamp!.formatted())")
                }
                .disabled(navigation.path.contains(/* some Item */))
            }
        }
        .environmentObject(navigation)
    }
}

然而令我惊讶的是，NavigationPath没有contains()函数。有什么想法吗？