<https://discuss.kotlinlang.org/t/datatype-for-onl...

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"DataType" for only initial null value
For various reasons I work with classes which contain variables for objects which only can be null if not initialized.
I would like this as an option to declare.
class Hull {

var nodeHullOptions: List? = null
private set

}

I would suggest a third option: Do not allow to assign null again, maybe mark it with an additional exclamation mark:
class Hull {

var nodeHullOptions: List?! = null
private set

}

The compiler can then do all the same checks it would do...