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kotlinlang

hey everyone. is there any way to mark a field as optional in auto-modeled http body message? like, define:
```data class ApproveRequest(val roleId: Int, val extraPermissions: List&lt;InboundPermission&gt; = emptyList())```
and
```private val requestLens = Body.auto&lt;ApproveRequest&gt;().toLens()```
want i want is the field `extraPermissions` will be marked as `optional` instead of `required`  in generated OpenApi doc because it have a default value. this may seems somewhat unreasonable, but i just met this in my backend application :sweat_smile:

You should be able to just mark the field as billable in the data class.

thanks! seems marked as nullable and use `null` as default value could fix