message: use as_secs_f64
diff: @@ -235,7 +235,7 @@ where
  if self.timer {
  let duration = duration.unwrap();
  let tmp = kv!(
  - "time" => duration.as_secs() as f64 + f64::from(duration.subsec_nanos()) * 1e-9;
  + "time" => duration.as_secs_f64();
  );
  log = log.merge(tmp);
  }
  