docs: function needsHexEscape(character) {
    return !((0x00020 <= character && character <= 0x00007E) ||
             (0x00085 === character)                         ||
             (0x000A0 <= character && character <= 0x00D7FF) ||
             (0x0E000 <= character && character <= 0x00FFFD) ||
             (0x10000 <= character && character <= 0x10FFFF));
  }