[GR-63089] Value of 'new Intl.Locale("und").language' should be "und".

PullRequest: js/3453

Author: iamstolis

graal-js/src/com.oracle.truffle.js/src/com/oracle/truffle/js/builtins/intl/LocalePrototypeBuiltins.java

@@ -435,13 +435,13 @@ public JSLocaleLanguageAccessor(JSContext context, JSBuiltin builtin) {
         }
 
         @Specialization
-        public Object doLocale(JSLocaleObject localeObject) {
+        public TruffleString doLocale(JSLocaleObject localeObject) {
             String language = localeObject.getInternalState().getLanguage();
-            return language.isEmpty() ? Undefined.instance : Strings.fromJavaString(language);
+            return language.isEmpty() ? Strings.UND : Strings.fromJavaString(language);
         }
 
         @Specialization(guards = "!isJSLocale(bummer)")
-        public Object doOther(@SuppressWarnings("unused") Object bummer) {
+        public TruffleString doOther(@SuppressWarnings("unused") Object bummer) {
             throw Errors.createTypeErrorLocaleExpected();
         }
 

graal-js/src/com.oracle.truffle.js/src/com/oracle/truffle/js/runtime/Strings.java

@@ -506,6 +506,7 @@ private Strings() {
     public static final TruffleString ROUNDING_MODE = Strings.constant("roundingMode");
     public static final TruffleString TIME_ZONE = Strings.constant("timeZone");
     public static final TruffleString TIME_ZONE_NAME = Strings.constant("timeZoneName");
+    public static final TruffleString UND = Strings.constant("und");
 
     /* RegExp.escape constants */
     public static final TruffleString REGEXP_SYNTAX_CHARS_WITH_SOLIDUS = Strings.constant("^$\\.*+?()[]{}|/");

graal-js/test/test262.json

@@ -2912,10 +2912,6 @@
       "COMPILE_IMMEDIATELY" : "SKIP"
     },
     "comment" : "Long-running in compile mode"
-  }, {
-    "filePath" : "intl402/Locale/getters.js",
-    "status" : "FAIL",
-    "comment" : "new failures 2025-03-13"
   }, {
     "filePath" : "intl402/NumberFormat/currency-digits-nonstandard-notation.js",
     "status" : "FAIL",