@SuppressWarnings("GoodTime") // duration decomposition
  private static long toNanosSaturated(java.time.Duration duration) {
    // Using a try/catch seems lazy, but the catch block will rarely get invoked (except for
    // durations longer than approximately +/- 292 years).
    try {
      return duration.toNanos();
    } catch (ArithmeticException tooBig) {

  @CanIgnoreReturnValue
  public CacheBuilder<K, V> refreshAfterWrite(long duration, TimeUnit unit) {
    checkNotNull(unit);
    checkState(refreshNanos == UNSET_INT, "refresh was already set to %s ns", refreshNanos);
    checkArgument(duration > 0, "duration must be positive: %s %s", duration, unit);
    this.refreshNanos = unit.toNanos(duration);
    return this;
  }