JsonUnwrapped doesn't work with Map

[Keshi]

case class MapWrapper(@(JsonUnwrapped @field @getter @beanGetter) val x:Map[Int,Int])

object JsonMapper extends ObjectMapper with ScalaObjectMapper {
  registerModule(DefaultScalaModule)
}

JsonMapper.writeValueAsString(MapWrapper(Map(1->2)))

res1: String =
{
  "x" : {
    "1" : 2
  }
}

Whereas,

case class Inner(x:Int)
case class Wrapper(@(JsonUnwrapped @field @getter @beanGetter) y:Inner)
JsonMapper.writeValueAsString(Wrapper(Inner(1)))

res3: String =
{
  "x" : 1
}

[cowtowncoder]

Functionality for unwrapping is implemented by jackson-databind, not Scala module. But this feature only works for POJOs (and Scala equivalents), not Maps or JsonNodes.
So I think this is same as:

FasterXML/jackson-databind#171

There are no current plans to try to extend @JsonUnwrapped to work with Maps.