Собственно, сабж: https://www.phoronix.com/news/Linux-Reverts-Special-Char-Uni .
Linus Torvalds took to reverting some code tonight within the mainline Linux kernel that inadvertently had broken support having filenames with ❤️ and other special Unicode characters in filenames when on file-systems with case-folding (optional case insensitive file/folder name) support.
Linus Torvalds commented in the revert: «It turns out that we can't do this, because while the old behavior of ignoring ignorable code points was most definitely wrong, we have case-folding filesystems with on-disk hash values with that wrong behavior.
So now you can't look up those names, because they hash to something different.
Of course, it's also entirely possible that in the meantime people have created *new* files with the new („more correct“) case folding logic, and reverting will just make other things break.
The correct solution is to not do case folding in filesystems, but sadly, people seem to never really understand that. People still see it as a feature, not a bug.»
