case "a":
		return 1
	case "bb":
		return 2
	case "ccc":
		return 3
	case "dddd":
		return 4
	case "eeeee":
		return 5
	case "ffffff":
		return 6
	case "ggggggg":
		return 7
	case "hhhhhhhh":
		return 8
	default:
		return len(x)
	}
}

// Use single-byte ordered comparisons for binary searching strings.
// See issue 53333.
func mimetype(ext string) string {