code: func (o ZoneAnalyticsOptions) encode() string {
  	v := url.Values{}
  	if o.Since != nil {
  		v.Set("since", (*o.Since).Format(time.RFC3339))
  	}
  	if o.Until != nil {
  		v.Set("until", (*o.Until).Format(time.RFC3339))
  	}
  	if o.Continuous != nil {
  		v.Set("continuous", fmt.Sprintf("%t", *o.Continuous))
  	}
  	return v.Encode()
  }
docs: // encode encodes non-nil fields into URL encoded form.