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And how can I make optional deletaged properties ?
I'm coupling serialization with Compose and I have a `val state by mutableStateOf(MyEnum.FIRST_VALUE)`, I want to omit the field if it is equal to `MyEnum.FIRST_VALUE` as it is the default one and most used through my code, but I don't understand how :thinking_face:

I have a custom Serialiazer and I'm encoding the value as Nullable and I've set `encodeDefaults = false` in my Json configuration, but it's still emitted and when I try to read the JSON I get this
```Exception in thread "AWT-EventQueue-0" kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 8: Expected numeric literal
JSON input: [{"task":"test #1","state":null},{"task":"test #2","state":null}]```

from just earlier: <https://kotlinlang.slack.com/archives/C7A1U5PTM/p1628333117029900>

also <https://github.com/Kotlin/kotlinx.serialization/pull/1528> merged, so there should be `@EncodeDefault` in some future release