code: func (s *Series) GetIntervalOk() (int, bool) {
  	if s == nil || s.Interval == nil {
  		return 0, false
  	}
  	return *s.Interval, true
  }
docs: // GetIntervalOk returns a tuple with the Interval field if it's non-nil, zero value otherwise
  // and a boolean to check if the value has been set.