Perhaps it takes care of itself if writing to a USB drive, but I used xorriso to create a combined .iso from 3 Debian BluRay disks and ended up with an unusable distro because all the file and folder names had been converted to upper case. I found that adding the lowercase rule to the -compliance rule in line 1119 (so now -compliance no_emul_toc:lowercase) fixed it. The leading dot in .disk was also changed to an underscore, and did not find a solution.