Fails to handle case where enum is the key of a map inside a data class

[andrew-smartnews]

Running the following code:

package com.example

import com.beust.klaxon.Klaxon

enum class AnEnum {
    VALUE_ONE,
    VALUE_TWO,
}

typealias AMap = Map<AnEnum, Int>

data class AMapContainer(val aMap: AMap)

fun main() {
    val klaxon = Klaxon()

    val aMap = mapOf(AnEnum.VALUE_ONE to 1, AnEnum.VALUE_TWO to 2)

    val aMapContainer = AMapContainer(aMap)
    println("object:\n$aMapContainer")

    println("this works:")
    println(aMapContainer.aMap.keys.first().toString())

    val jsonString = klaxon.toJsonString(aMapContainer)
    println("json string:\n$jsonString")

    val recovered = klaxon.parse<AMapContainer>(jsonString)!!
    println("recovered object:\n$recovered")

    println("this does not work, but should:")
    println(recovered.aMap.keys.first().toString())
}

Results in the following output:

object:
AMapContainer(aMap={VALUE_ONE=1, VALUE_TWO=2})
this works:
VALUE_ONE
json string:
{"aMap" : {"VALUE_ONE": 1, "VALUE_TWO": 2}}
recovered object:
AMapContainer(aMap={VALUE_ONE=1, VALUE_TWO=2})
this does not work, but should:
Exception in thread "main" java.lang.ClassCastException: class java.lang.String cannot be cast to class com.example.AnEnum (java.lang.String is in module java.base of loader 'bootstrap'; com.example.AnEnum is in unnamed module of loader 'app')
	at com.example.KlaxonBugDemonstrationKt.main(klaxonBugDemonstration.kt:32)
	at com.example.KlaxonBugDemonstrationKt.main(klaxonBugDemonstration.kt)

Process finished with exit code 1

I would expect the code to finish printing without error. The issue is that enums are not being deserialized back into the map keys correctly, they are coming in as strings, but the compiler thinks they are enum instances.

I am using version 5.6 btw.