Can I not have a base interface without it adding a `type` field? I do not want polymorphism here as...

# serialization

[zt]

Can I not have a base interface without it adding a type field? I do not want polymorphism here as the type is determined by the structure. Is there some way around this?

@Serializable
interface Base {
    val a: Int
}

// should serialize to { "a": 10, "b": 10 }
@Serializable
data class A(override val a: Int, val b: Int) : Base

// should serialize to { "a": 10, "c": 10 }
@Serializable
data class B(override val a: Int, val c: Int) : Base

[Vampire]

In deserialisation: https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/json.md#content-based-polymorphic-deserialization

In serialisation: https://kotlinlang.org/api/kotlinx.serialization/kotlinx-serialization-json/kotlinx.serialization.json/-class-discriminator-mode/-n-o-n-e/