mutableStateFlow

fun <T> SavedStateHandle.mutableStateFlow(    key: BundleKey<T, *>,     scope: CoroutineScope,     debounceWrites: Duration = Duration.ZERO): MutableStateFlow<T>
fun <T> TypedSavedStateHandle.mutableStateFlow(    key: BundleKey<T, *>,     scope: CoroutineScope,     debounceWrites: Duration = Duration.ZERO): MutableStateFlow<T>
fun <T> SavedStateHandle.mutableStateFlow(    key: AsyncBundleKey<T, *>,     scope: CoroutineScope,     debounceWrites: Duration = Duration.ZERO): MutableStateFlow<T?>
fun <T> TypedSavedStateHandle.mutableStateFlow(    key: AsyncBundleKey<T, *>,     scope: CoroutineScope,     debounceWrites: Duration = Duration.ZERO): MutableStateFlow<T?>