code: func IsUTFNumeric(s string) bool {
  	for _, v := range s {
  		if unicode.IsNumber(v) == false {
  			return false
  		}
  	}
  	return true
  }
docs: // IsUTFNumeric check if the string contains only unicode numbers of any kind.
  // Numbers can be 0-9 but also Fractions ¾,Roman Ⅸ and Hangzhou 〩. Empty string is valid.