--- a/nashorn/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java	Wed Jul 05 19:53:51 2017 +0200
+++ b/nashorn/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java	Wed Aug 06 22:11:12 2014 +0530
@@ -715,6 +715,23 @@
         return newArgs;
     }
 
+    /**
+     * Are the given objects mirrors to same underlying object?
+     *
+     * @param obj1 first object
+     * @param obj2 second object
+     * @return true if obj1 and obj2 are identical script objects or mirrors of it.
+     */
+    public static boolean identical(final Object obj1, final Object obj2) {
+        final Object o1 = (obj1 instanceof ScriptObjectMirror)?
+            ((ScriptObjectMirror)obj1).sobj : obj1;
+
+        final Object o2 = (obj2 instanceof ScriptObjectMirror)?
+            ((ScriptObjectMirror)obj2).sobj : obj2;
+
+        return o1 == o2;
+    }
+
     // package-privates below this.
 
     ScriptObjectMirror(final ScriptObject sobj, final Global global) {