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> On OSX, the situation is somewhat different from POSIX, as
> you have additional functions to open files (which Python
> apparently does not use, though), and because OSX specifies
> that the byte strings have to be NFD UTF-8 (which Python
> violates AFAICT).

(I'm not 100% sure, but I think the OS corrects that)

> True if arbitrary Unicode strings can be used as file names
> (within limitations imposed by the file system), and if
> \function{os.listdir()} returns Unicode strings for a Unicode
> argument.
> 
> While the first part is true for OSX, I don't think the
> second part is.

It is, we had a long discussion about that back when I 
implemented that ;-)

> If that ever gets corrected (or verified),
> no further detection is necessary - just set
> macpath.supports_unicode_filenames for darwin (assuming you
> use macpath.py on that system). 

Darwin is a posix platform, so I'll have to add a switch to 
posixpath.py. Unless you object to that, I will do that.