Inconsistent decomposition of case class with Option of value class

[mikaelstaldal]

json4s version 3.5.0

scala version 2.11.8

jdk version 1.8.0_45

Code:

import org.json4s.DefaultFormats
import org.json4s.jackson.Serialization

case class Id(id: String) extends AnyVal

case class Data1(id: Id, name: String)

case class Data2(id: Option[Id], name: String)

object Json4sTest {
  implicit val formats = DefaultFormats

  def main(args: Array[String]): Unit = {
    val data1 = Data1(Id("17"), "foo")
    val data2 = Data2(Some(Id("17")), "foo")
    println(s"json 1: ${Serialization.write(data1)}")
    println(s"json 2: ${Serialization.write(data2)}")
  }
}

actual output:

json 1: {"id":"17","name":"foo"}
json 2: {"id":{"id":"17"},"name":"foo"}

expected output:

json 1: {"id":"17","name":"foo"}
json 2: {"id":"17","name":"foo"}

or maybe:

json 1: {"id":{"id":"17"},"name":"foo"}
json 2: {"id":{"id":"17"},"name":"foo"}