class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            val store = Store(stateKeeper())
            Text(text = store.state.number.toString())
        }
    }
}


@Parcelize
data class State(val number: Int) : Parcelable

class Store(stateKeeper: StateKeeper) {
    val state: State = stateKeeper.consume("Register") ?: State(Random.nextInt())

    init {
        stateKeeper.register("Register") { state }
    }
}

setContent {}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val store = Store(stateKeeper())
    setContent {
        Text(text = store.state.number.toString())
    }
}

savedInstanceState