Abstract FilePath Proposal

[Yitzchak Gale]

I wrote:
> On Mac OS X, it's normalized Unicode.

Brandon Allbery wrote:

> This is only true for higher level OS X APIs. ghc normally operates in the
> BSD layer, which mostly follows POSIX semantics; in particular, filesystem
> paths are bytestrings in the BSD layer, and only normalized in Cocoa APIs.
>

If I happen to be writing a program that only interacts with the
BSD layer, then I can use the POSIX-style FilePath.
But as an application writer, most of the time I'll be dealing
with Mac OS X paths that need to work correctly with Cocoa.
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