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kotlinlang

Why do I get
```
ISE: Class Duration have constructor parameters which are not properties and therefore it is not serializable automatically
```
When I specify `@Serializable(with = DurationSerializer::class)` and a matching `@Serializer(forClass = Duration::class)`?
There shouldn't be automatic serialization.

*EDIT:* oh wow, it happens when I "half-specify" a serializer.
I had `deserialize` and `serialize` but not `descriptor`.
Kinda unexpected that if you create a custom serializer it generates a descriptor automatically based on the constructor which may be a total mismatch with what my serializer actually does :thinking_face:
Is that intentional?

I think we'll prohibit partial auto-generation of serializers at some point in future, i.e. you'll have to override everything or nothing in the serializer