code: func (s *StdoutClient) FGauge(stat string, value float64) error {
  	if value < 0 {
  		err := s.send(stat, "%d|g", 0)
  		if nil != err {
  			return err
  		}
  		return s.send(stat, "%g|g", value)
  	}
  	return s.send(stat, "%g|g", value)
  }
docs: // FGauge -- Send a floating point value for a gauge