docs: @VisibleForTesting
    static RateLimiter create(SleepingStopwatch stopwatch, double permitsPerSecond) {
      RateLimiter rateLimiter = new SmoothBursty(stopwatch, 1.0 /* maxBurstSeconds */);
      rateLimiter.setRate(permitsPerSecond);
      return rateLimiter;
    }