Value Class behaves strange

temp.scala

import org.json4s._
import org.json4s.jackson.JsonMethods._
import org.json4s.jackson.Serialization._

Object Temp{
  case class Attributes(value: String) extends AnyVal
  case class Temp(seq: Seq[Attributes])
  def main(args: Array[String]): Unit = {
    val a = """ {"seq":["test"]} """
    val b = Seq("test")
    println(parse(a).extract[Temp])
    println(Temp(b.map(c => Attributes(c))))
  }
  // this behaves such as below
  // Temp(List(test))
  // Temp(List(Attributes(test)))
}