code: func NewPooledWorkerPoolOptions() PooledWorkerPoolOptions {
  	return &pooledWorkerPoolOptions{
  		growOnDemand:          defaultGrowOnDemand,
  		numShards:             defaultNumShards,
  		killWorkerProbability: defaultKillWorkerProbability,
  		nowFn: defaultNowFn,
  		iOpts: instrument.NewOptions(),
  	}
  }
docs: // NewPooledWorkerPoolOptions returns a new PooledWorkerPoolOptions with default options