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kotlinlang

I've got a method that fails to deserialize:
```fun getAll(): Collection&lt;User&gt;```
I get:
```kotlinx.serialization.SerializationException: Can't locate argument-less serializer for class LinkedValues. For generic classes, such as lists, please provide serializer explicitly.```
I think I need to somehow indicate that this method should deserialize with `User.serializer().list`. But I'm not sure how to do that.

I tried adding this to the method:
```@Serializable(with = User.serializer().list)```
But the annotation is not applicable to member functions.

Fixed - had to return a List, not a Collection.