@CanIgnoreReturnValue
  public CacheBuilder<K, V> expireAfterWrite(java.time.Duration duration) {
    return expireAfterWrite(toNanosSaturated(duration), TimeUnit.NANOSECONDS);
  }

  /**
   * Specifies that each entry should be automatically removed from the cache once a fixed duration
   * has elapsed after the entry's creation, or the most recent replacement of its value.
   *

  @SuppressWarnings("GoodTime") // nanos internally, should be Duration
  long getRefreshNanos() {
    return (refreshNanos == UNSET_INT) ? DEFAULT_REFRESH_NANOS : refreshNanos;
  }

  /**
   * Specifies a nanosecond-precision time source for this cache. By default, {@link
   * System#nanoTime} is used.
   *
   * <p>The primary intent of this method is to facilitate testing of caches with a fake or mock
   * time source.
   *