message: Remove a gratuitous syscall in `Instant::now`
diff: @@ -292,7 +292,7 @@ async fn worker(
  while resources_available < 0 {
  // Determine time delta since last refill.
  let now = Instant::now();
  - let elapsed = Instant::now() - last_refill;
  + let elapsed = now - last_refill;
  last_refill = now;
  // Add appropriate amount of resources, capped at `max_stored_bytes`.
  