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kotlinlang

Yaml / Kaml: Having some difficulty with a sealed class that has abstract properties which are not part of the primary constructor - the property is a lateinit var, but I get a MissingPropertyException. Sample code:
```sealed class Node {
  abstract var key: String
  
  data class PostNode(val title: String) : Node {
    override lateinit var key: String
  }
}
```
And a sample yaml file might simply be:
```title: This is a post
```
Kaml can't deserialize this, as it says that "key" is required but missing. My understanding was that only properties in the primary constructor are required?

In the real implementation, there are other properties that aren't part of the `PostNode` constructor, and they are working fine.

I've tested with Json instead of Yaml; same problem. The abstract property key is being treated as required.

(that leaves it out of serialization, obviously)

Yeah. Trouble is, I do want it for serialization, just not for deserialization... I'm trying to do too many things with one class, I think! So for now I've created a simpler class for my yaml, then copied its data in to my PostNode class.