> You can try to make a function or an extensio...

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[cedric]

You can try to make a function or an extension function for NodeHolder<T>, which doesnt't take T as a parameter, for example, NodeHolder<T>.bindAt(position: Int). Then you'll be able to call such extension on NodeHolder<out T>.

@ilya.gorbunov Your suggestion reminds me of Haskell's Phantom Types