docs: def hexdigest(self):
          """Return the digest value as a string of hexadecimal digits."""
          if not self._final:
              if self._buf_len >= self._MIN_LEN:
                  self._tlsh.final()
                  self._final = True
              else:
                  raise ValueError("tlsh requires buffer with length >= %d "
                                   "for mode where force = %s" % \
                                   (self._MIN_LEN, False))
          return self._tlsh.hexdigest()