Filesystems and case-insensitivity

Indeed, the existence of the file accessed by a given byte sequence will vary depending on locale. This is true for many situations, not just the rather clear turkish one.

This leads to a problem where a user or process in one locale should get different results from the kernel than another. This traditionally was viewed as a rathole and I've seen many situations where osx behaves in bizarre ways due to this sort of thing.

The proposal here seems to be to push the rules into the filesystem or directory, which effectively means having locale behavior independent of the user / process, which means we will get a fun matrix of file name locale vs user locale. I'm not a fan.