code: func newCubicCC(s *sender) *cubicState {
  	return &cubicState{
  		t:    time.Now(),
  		beta: 0.7,
  		c:    0.4,
  		s:    s,
  	}
  }
docs: // newCubicCC returns a partially initialized cubic state with the constants
  // beta and c set and t set to current time.