code: func (dw *deltaSelector) undeltify(otp *ObjectToPack) error {
  	if err := dw.restoreOriginal(otp); err != nil {
  		return err
  	}
  
  	otp.Object = otp.Original
  	otp.Depth = 0
  	return nil
  }
docs: // undeltify undeltifies an *ObjectToPack by retrieving the original object from
  // the storer and resetting it.