docs: public static void compareContextState(String filterName, SessionContext context, SessionContext copy) {
          // TODO - only comparing Attributes. Need to compare the messages too.
          Iterator<String> it = context.keySet().iterator();
          String key = it.next();
          while (key != null) {
              if ((!key.equals("routingDebug") && !key.equals("requestDebug"))) {
                  Object newValue = context.get(key);
                  Object oldValue = copy.get(key);
                  if (oldValue == null && newValue != null) {
                      addRoutingDebug(context, "{" + filterName + "} added " + key + "=" + newValue.toString());
                  } else if (oldValue != null && newValue != null) {
                      if (!(oldValue.equals(newValue))) {
                          addRoutingDebug(context, "{" +filterName + "} changed " + key + "=" + newValue.toString());
                      }
                  }
              }
              if (it.hasNext()) {
                  key = it.next();
              } else {
                  key = null;
              }
          }
  
      }