docs: public NettyServerBuilder maxConnectionIdle(long maxConnectionIdle, TimeUnit timeUnit) {
      checkArgument(maxConnectionIdle > 0L, "max connection idle must be positive");
      maxConnectionIdleInNanos = timeUnit.toNanos(maxConnectionIdle);
      if (maxConnectionIdleInNanos >= AS_LARGE_AS_INFINITE) {
        maxConnectionIdleInNanos = MAX_CONNECTION_IDLE_NANOS_DISABLED;
      }
      if (maxConnectionIdleInNanos < MIN_MAX_CONNECTION_IDLE_NANO) {
        maxConnectionIdleInNanos = MIN_MAX_CONNECTION_IDLE_NANO;
      }
      return this;
    }