code: func NewOptions() Options {
  	return &options{
  		scope:          tally.NoopScope,
  		initialBackoff: defaultInitialBackoff,
  		backoffFactor:  defaultBackoffFactor,
  		maxBackoff:     defaultMaxBackoff,
  		maxRetries:     defaultMaxRetries,
  		forever:        defaultForever,
  		jitter:         defaultJitter,
  		rngFn:          rand.Int63n,
  	}
  }
docs: // NewOptions creates new retry options.