TaskLocal.swift

enum TaskData {
    @TaskLocal static var userId: Int?
}

Task {
    await TaskData.$userId.withValue(786) {
        let task = Task {
            print(TaskData.userId ?? "No User Id")
        }
        print(TaskData.userId ?? "No User Id")
    }
    
    await TaskData.$userId.withValue(234) {
        let task = Task {
            print(TaskData.userId ?? "No User Id")
        }
        print(TaskData.userId ?? "No User Id")
    }
}