KSerializer for Int as Hex string

IntHexSerializer.kt

import kotlinx.serialization.KSerializer
import kotlinx.serialization.Serializable
import kotlinx.serialization.descriptors.PrimitiveKind
import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder

class IntHexSerializer : KSerializer<Int> {
    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("IntHex", PrimitiveKind.STRING)
    override fun serialize(encoder: Encoder, value: Int) {
        encoder.encodeString("%08X".format(value))
    }

    override fun deserialize(decoder: Decoder): Int {
        return decoder.decodeString().toInt(16)
    }
}