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How can I create a descriptor for a Json list always containing a single element?

It sounds like a you want a tuple? Try looking at this issue <https://github.com/Kotlin/kotlinx.serialization/issues/1906>

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Problem: I have two classes, `Functional` (a tuple of one), and `Primitive` (converts `{ "@value": "etc" }` to `"etc"` ).
However, when using `Functional&lt;Primitive&lt;String&gt;&gt;`, I get the following error:
```kotlinx.serialization.json.internal.JsonDecodingException: Expected class kotlinx.serialization.json.JsonObject as the serialized body of quest.laxla.khuzdul.Primitive, but had class kotlinx.serialization.json.JsonArray```

The purpose is to convert `[{"@value": "etc"}]` to `"etc"`

alright now both work on their own but it still doesn't work together??

```Expected class kotlinx.serialization.json.JsonObject as the serialized body of quest.laxla.khuzdul.Primitive, but had class kotlinx.serialization.json.JsonArray```

`encoder.encodeStructure` along with `encoder.encodeSerializableValue` looks suspect to me

Typically I'd use `encoder.encodeStructure` to do everything manually.... that is to say, I don't use it because doing it manually is a hassle :)

<https://github.com/Kotlin/kotlinx.serialization/blob/v1.6.3/docs/serializers.md#hand-written-composite-serializer>

instead of doing `encodeSerializableValue` inside of `encodeStructure`, I think there will be an `encodeElement(...)` instead?

hmmm `encodeSerializableElement` should use the descriptor of the _value_, not the descriptor of your  Functional/Primitive Serializers?

idk, cause I already give it the serializer

Primitive is now implemented like this cause I'm stupid

I fixed functional's deserializer which apparently didn't work well