code: func (s GoSignature) AlphaBetas() []string {
  	var retVal []string
  	for _, p := range s.Params {
  		if inList(p.Name, alphaBetaParams) {
  			retVal = append(retVal, p.Name)
  		}
  	}
  	return retVal
  }
docs: // HasAlphaBeta returns true if one of the parameters are alpha/beta