docs: def lv_unpack(txt):
      """
      Deserializes a string of the length:value format
  
      :param txt: The input string
      :return: a list og values
      """
      txt = txt.strip()
      res = []
      while txt:
          l, v = txt.split(':', 1)
          res.append(v[:int(l)])
          txt = v[int(l):]
      return res