*** old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/JSType.java	Wed Nov 26 14:36:26 2014
--- new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/JSType.java	Wed Nov 26 14:36:26 2014

*** 712,721 ****
--- 712,724 ----
       * @param obj  an object
       *
       * @return a number
       */
      public static double toNumber(final Object obj) {
+         if (obj instanceof Double) {
+             return (Double)obj;
+         }
          if (obj instanceof Number) {
              return ((Number)obj).doubleValue();
          }
          return toNumberGeneric(obj);
      }