for len(s) > 0 {
		if !as.contains(s[len(s)-1]) {
			break
		}
		s = s[:len(s)-1]
	}
	return s
}

func trimRightUnicode(s []byte, cutset string) []byte {
	for len(s) > 0 {
		r, n := rune(s[len(s)-1]), 1
		if r >= utf8.RuneSelf {
			r, n = utf8.DecodeLastRune(s)
		}
		if !containsRune(cutset, r) {
			break
		}
		s = s[:len(s)-n]
	}
	return s
}