code: func NewParams() *Params {
  	return &Params{
  		insCost:        1,
  		subCost:        1,
  		delCost:        1,
  		maxCost:        0,
  		minScore:       0,
  		bonusPrefix:    4,
  		bonusScale:     .1,
  		bonusThreshold: .7,
  	}
  }
docs: // NewParams creates a new set of parameters and initializes it with the default values.