SnapshotMutationPolicy.kt

fun <T> mutableStateOf(
    value: T,
    policy: SnapshotMutationPolicy<T> = structuralEqualityPolicy()
): MutableState<T> = createSnapshotMutableState(value, policy)


class ViewModel {
    val state = mutableStateOf("init", object : SnapshotMutationPolicy<String> {
        override fun equivalent(a: String, b: String): Boolean {
            return a == b
        }

        override fun merge(previous: String, current: String, applied: String): String {
            return applied
        }
    })
}