Component used: Navigation
Version used: 2.8.0-alpha08
Devices/Android versions reproduced on: Pixel 6a (Android 14)

Getting the custom arg in a ViewModel when using just serializables instead of parcelables with this NavType:

val bookType = object : NavType<Book>(isNullableAllowed = false) {
override fun get(bundle: Bundle, key: String): Book? {
return bundle.getString(key)?.let { Json.decodeFromString<Book>(it) }
}

override fun parseValue(value: String) = Json.decodeFromString<Book>(value)

override fun serializeAsValue(value: Book): String = Json.encodeToString(value)

override fun put(bundle: Bundle, key: String, value: Book) {
bundle.putString(key, Json.encodeToString(value))
}
}

It works well if I get the value from the NavBackStackEntry but if I do this in the ViewModel:
val bookDetail = savedStateHandle.toRoute<BookDetail>()

I get this error when navigating to the detail:
java.lang.ClassCastException: java.lang.String cannot be cast to com.example.composenavigation.typesafety.Book

You can see an example in: https://github.com/edgarmiro/compose-navigation-type-safety
The navigation is in the file: TypeSafetyNavigation.kt

Thanks in advance!