} else {
		return fmt.Sprintf("%s %s: %v", e.verb, e.path, e.err)
	}
}

func (e *zipError) Unwrap() error {
	return e.err
}

// strToFold returns a string with the property that
//
//	strings.EqualFold(s, t) iff strToFold(s) == strToFold(t)
//
// This lets us test a large set of strings for fold-equivalent
// duplicates without making a quadratic number of calls