docs: public void warn(String format, Object arg1, Object arg2) {
          if (!logger.isWarnEnabled())
              return;
  
          if (instanceofLAL) {
              String formattedMessage = MessageFormatter.format(format, arg1, arg2).getMessage();
              ((LocationAwareLogger) logger).log(null, fqcn, LocationAwareLogger.WARN_INT, formattedMessage, new Object[] { arg1, arg2 }, null);
          } else {
              logger.warn(format, arg1, arg2);
          }
      }