It looks like a value of true or false really does force it; and not setting it will default to 64bit. Do you want to update comment? Or if leaving comment as-is then can you include a TODO to indicate that it needs attention at some point.

From jclouds TemplateBuilder, called by `templateBuilder.findSupportedImages(...)` -> `buildTemplatePredicate()`:

   private final Predicate<OperatingSystem> os64BitPredicate = new Predicate<OperatingSystem>() {
      @Override
      public boolean apply(OperatingSystem input) {
         boolean returnVal = true;
         if (os64Bit != null) {
            if (os64Bit)
               return input.is64Bit();
            else
               return !input.is64Bit();
         }
         return returnVal;
      }

      @Override
      public String toString() {
         return "os64Bit(" + os64Bit + ")";
      }
   };