docs: public static void logExpensive(Level level, String message, Throwable e) {
      String[] caller = inferCaller();
      if(caller != null) {
        Logger logger = Logger.getLogger(caller[0]);
        logger.logp(level, caller[0], caller[1], message, e);
      }
      else {
        Logger.getAnonymousLogger().log(level, message, e);
      }
    }