Serialization and deserialization of a generic type in gson

GsonGenericAdapter.kt

data class UniqueIdentifier<out T>(val value: T)

typealias TransactionId = UniqueIdentifier<Int>

class UniqueIdentifierAdapter : JsonSerializer<UniqueIdentifier<*>>, JsonDeserializer<UniqueIdentifier<*>> {

    override fun serialize(
        src: UniqueIdentifier<*>,
        typeOfSrc: Type,
        context: JsonSerializationContext
    ): JsonElement {
        return context.serialize(src.value)
    }

    override fun deserialize(
        json: JsonElement,
        typeOfT: Type,
        context: JsonDeserializationContext
    ): UniqueIdentifier<*> {
        val value = context.deserialize<Any>(json, typeOfT.javaClass.genericSuperclass)
        return UniqueIdentifier(value)
    }
}