code: func GetOptionRequest(o dhcp6.Options) (OptionRequestOption, error) {
  	v, err := o.GetOne(dhcp6.OptionORO)
  	if err != nil {
  		return nil, err
  	}
  
  	var oro OptionRequestOption
  	err = oro.UnmarshalBinary(v)
  	return oro, err
  }
docs: // GetOptionRequest returns the Option Request Option value, as described in
  // RFC 3315, Section 22.7.
  //
  // The slice of OptionCode values indicates the options a DHCP client is
  // interested in receiving from a server.