[bug-diffutils] bug#33467: bug#33467: "diff" can not scan directories with same dev/inode

[Mark Raymond]

> POSIX says that a file is uniquely determined by its inode and device
> number.

This makes sense for files - but I'm not convinced it makes sense for 
directories. The only cases I can think of where two directories could have the 
same inode and device number are bind mounts (and theoretically directory hard 
links) - and in both those cases it's legitimate for there to be different 
mounts on subdirectories.