Gson允许我执行GsonBuilder().registerTypeAdapter(MyInterface::class.java, MyConcreteClassAdapter())，但我无法对kotlinx.serialization执行相同操作
我只想公开接口（ValueInterface），这样我就可以隐藏实现和序列化细节。
请注意，ValueObject有它自己的自定义序列化。
下列程式码会以kotlinx.serialization.SerializationException: Class 'ValueObject' is not registered for polymorphic serialization in the scope of 'ValueInterface'. Mark the base class as 'sealed' or register the serializer explicitly.中断。
然而，当我将Box值类型更改为ValueObject而不是ValueInterface时，它就可以工作了。
我需要做什么更改才能使它像Gson一样工作，并能够拥有ValueInterface类型的字段？

package kxs

import kotlinx.serialization.KSerializer
import kotlinx.serialization.Serializable
import kotlinx.serialization.decodeFromString
import kotlinx.serialization.descriptors.PrimitiveKind
import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encodeToString
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder
import kotlinx.serialization.json.Json
import org.junit.Assert
import org.junit.Test

class KXSTest {

    @Test
    fun test(){
        val actualStr = Json.encodeToString(Box("name1",ValueInterface.create(42)))
        Assert.assertEquals("""{"name":"name1","value":42}""",actualStr)

        val actualObj: Box = Json.decodeFromString("""{"name":"name2","value":43}""")
        Assert.assertEquals(Box("name2",ValueInterface.create(43)),actualObj)

    }
}

// public stuff
interface ValueInterface {
    fun value() : Long

    companion object {
        fun create(long: Long) =
            ValueObject(long)
    }
}

@Serializable
data class Box(val name: String, val value: ValueInterface)

//internal details not meant to be exposed
@Serializable(with = ValueObjectAsLong::class)
data class ValueObject(val value: Long): ValueInterface {
    init {
        require(value > 0)
    }
    override fun value(): Long = value
}

object ValueObjectAsLong : KSerializer<ValueObject> {
    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("ValueObjectAsLong",PrimitiveKind.LONG)

    override fun deserialize(decoder: Decoder): ValueObject {
        return ValueObject(decoder.decodeLong())
    }

    override fun serialize(encoder: Encoder, value: ValueObject) {
        encoder.encodeLong(value.value)
    }
}