Their whole "scheme", where ".." can be dealt with as a canonicalizing step BEFORE submitting the path to the OS for actual opening, seems to require refinement

Their whole "scheme", where ".." can be dealt with as a canonicalizing step BEFORE submitting the path to the OS for actual opening, seems to require refinement when symlinks are involved. Take a perfectly spherical unix: $ mkdir /tmp/hn $ cd /tmp/hn $ ln -s . foo; mkdir bar; touch baz $ ls -l bar/../baz foo/baz foo/../baz ls: cannot access 'foo/../baz': No such file or directory -rw-r--r-- 1 jepler jepler 0 Nov 28 18:21 bar/../baz -rw-r--r-- 1 jepler jepler 0 Nov 28 18:21 foo/baz Fuscsia-with-symlinks would have some extra hoops to jump through to make rewriting act like POSIX in the case that /tmp/hn is not escaped, which surely you'd want if you went ahead and introduced symlinks.