Note: even for UCS-∞, to avoid excessive load on the server, maxNUD (maximum number of USV hexadecimal digits) is limited to 64, for U+7FFFFFFF_FFFFFFFF_FFFFFFFF_FFFFFFFF_FFFFFFFF_FFFFFFFF_FFFFFFFF_FFFFFFFF, and the input string length is limited to 154, for the corresponding UTF-∞-16 code DDFF DE29 DE07 DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF DFFF.