code: func ListenAddrStrings(s ...string) Option {
  	return func(cfg *Config) error {
  		for _, addrstr := range s {
  			a, err := ma.NewMultiaddr(addrstr)
  			if err != nil {
  				return err
  			}
  			cfg.ListenAddrs = append(cfg.ListenAddrs, a)
  		}
  		return nil
  	}
  }
docs: // ListenAddrStrings configures libp2p to listen on the given (unparsed)
  // addresses.