Writing Scala 3 enums is broken

Trying to write Scala 3 enum values actually writes always the first one.

Test reproducing the problem

package upickle

import scala.language.implicitConversions
import utest._

import upickle.default._

object EnumTests extends TestSuite {

  enum SimpleEnum {
    case A, B
  }

  val tests = Tests {
    test("simple") {
      given ReadWriter[SimpleEnum] = macroRW[SimpleEnum]
      test("enum write") {
        val parsed = write(SimpleEnum.B)
        val expected = """{"$type":"upickle.EnumTests.SimpleEnum.B"}"""
        assert(parsed == expected)
      }
    }
  }
}

Fails with:

X upickle.EnumTests.simple.enum write 71ms 
  utest.AssertionError: parsed == expected
  parsed: String = {"$type":"upickle.EnumTests.SimpleEnum.A"}
  expected: String = {"$type":"upickle.EnumTests.SimpleEnum.B"}

[htmldoug]

There might be something useful that can be ported over from https://github.com/rallyhealth/weePickle/pull/94.

[JD557]

Looks like ADTs encoded using enums also fail.

Using the Color example in https://docs.scala-lang.org/scala3/reference/enums/adts.html

import upickle.default._

enum Color(val rgb: Int):
  case Red   extends Color(0xFF0000)
  case Green extends Color(0x00FF00)
  case Blue  extends Color(0x0000FF)
  case Mix(mix: Int) extends Color(mix)

object Color {
  implicit val rw: ReadWriter[Color] = macroRW
}

Fails with

Exception occurred while executing macro expansion.
java.lang.Exception: Enumeration valueOf method not found
	at upickle.implicits.macros.macros$package$.$anonfun$8(macros.scala:104)
	at scala.Option.getOrElse(Option.scala:201)
	at upickle.implicits.macros.macros$package$.enumValueOfImpl(macros.scala:105)