docs: public static boolean isForbiddenParamValueChar (final char c)
    {
      // INVALID_VALUE_CHAR_XML10 + 0x7f
      return (c >= 0x0 && c <= 0x8) ||
             (c >= 0xb && c <= 0xc) ||
             (c >= 0xe && c <= 0x1f) ||
             (c == 0x7f) ||
             (c >= 0xd800 && c <= 0xdfff) ||
             (c >= 0xfffe && c <= 0xffff);
    }