code: func (p *PoolsOpt) String() string {
  	var pools []string
  	for _, pool := range p.values {
  		repr := fmt.Sprintf("%s %d", pool.Base, pool.Size)
  		pools = append(pools, repr)
  	}
  	return strings.Join(pools, ", ")
  }
docs: // String returns a string repr of this option