Fixed #1285 by adding missing support of the @named annotation for terms of Scala 3 enumerations

Author: plokhotnyuk

jsoniter-scala-macros/shared/src/main/scala-3/com/github/plokhotnyuk/jsoniter_scala/macros/JsonCodecMaker.scala

@@ -1531,13 +1531,14 @@ object JsonCodecMaker {
         else '{ $in.unexpectedKeyError($l) }
 
       def discriminatorValue(tpe: TypeRepr): String =
-        val named = tpe.typeSymbol.annotations.filter(_.tpe =:= TypeRepr.of[named])
+        val isEnum = tpe.termSymbol.flags.is(Flags.Enum)
+        var named = (if (isEnum) tpe.termSymbol else tpe.typeSymbol).annotations.filter(_.tpe =:= TypeRepr.of[named])
         if (named.nonEmpty) {
           if (named.size > 1) fail(s"Duplicated '${TypeRepr.of[named].show}' defined for '${tpe.show}'.")
           namedValueOpt(named.headOption, tpe).get
         } else cfg.adtLeafClassNameMapper({
           if (tpe =:= TypeRepr.of[None.type]) "scala.None"
-          else if (tpe.termSymbol.flags.is(Flags.Enum)) {
+          else if (isEnum) {
             tpe match
               case TermRef(_, name) => name
               case _ => fail(s"Unsupported enum type: '${tpe.show}', tree=$tpe")

jsoniter-scala-macros/shared/src/test/scala-3/com/github/plokhotnyuk/jsoniter_scala/macros/JsonCodecMakerNewEnumSpec.scala

@@ -75,6 +75,10 @@ enum LinkedList[+T]:
   case End
   case Node(value: T, next: LinkedList[T])
 
+enum Side:
+  @named("0") case Buy
+  @named("1") case Sell
+
 enum ClientOut(@transient val tpe: String):
   @named("p") case Ping(@named("l") timestamp: Long) extends ClientOut("p")
   @named("m") case Move(@named("m") move: Long) extends ClientOut("m")
@@ -157,6 +161,9 @@ class JsonCodecMakerNewEnumSpec extends VerifyingSpec {
       verifySerDeser(make[List[FooEnum[Option]]], List(FooEnum.Bar[Option](Some(1)), FooEnum.Baz[Option](Some("VVV"))),
         """[{"type":"Bar","a":1},{"type":"Baz","a":"VVV"}]""")
     }
+    "serialize and deserialize Scala3 enums with cases that use named annotation" in {
+      verifySerDeser(makeWithoutDiscriminator[List[Side]], List(Side.Buy, Side.Sell), """["0","1"]""")
+    }
     "serialize and deserialize Scala3 enums with a transient field" in {
       verifySerDeser(make[List[ClientOut]](CodecMakerConfig.withDiscriminatorFieldName(Some("t"))),
         List(ClientOut.Ping(1), ClientOut.Move(1)), """[{"t":"p","l":1},{"t":"m","m":1}]""")