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kotlinlang

<@U3DTVBXD4> I'm doing MVI and I love it, especially with Kotlin, but my presenters don't survive config changes. I use `Conductor` so I don't need them too (Conductor's controllers persist through config changes).

I believe in your "partial state" sealed class, utilize `object : subclassName()` instead of `class : subclassName()`.

See: 

```
sealed class Expr {
    class Const(val number: Double) : Expr()
    class Sum(val e1: Expr, val e2: Expr) : Expr()
    object NotANumber : Expr()
}
```

So `Expr.NotANumber` would be equal to itself, because there can only be one instance of it