code: func (f *FailureStage) Normalize() error {
  	if f.Chance < 0 {
  		return fmt.Errorf("too small FailureStage chance")
  	}
  	if f.Chance > 1 {
  		return fmt.Errorf("too large FailureStage chance")
  	}
  	return nil
  }
docs: // Normalize checks FailureStage for errors and converts it to its normalized
  // form.