> The Apple File System, like HFS Plus, found on OS X Macintosh systems is encoded in UTF-8.

It's worse than that. Consider the following program: 

#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

use Unicode::Normalize qw{ NFKD NFKC };

say $^O;

my $letter = "\N{LATIN SMALL LETTER A WITH ACUTE}";

open my $out, '>', NFKD($letter) or die "Open: $!";
unlink NFKC($letter) or warn "Warn unlink: $!";
unlink NFKD($letter) or die "Unlink: $!";

[download]

Running it on Linux and Mac gives the following different outputs: 

linux
Warn unlink: No such file or directory at ./script.pl line 13.

[download]
versus 
darwin
Unlink: No such file or directory at ./script.pl line 14.

[download]

The same happens when you exchange NFKC and NFKD. Yes, on a Mac, normalization happens on top of UTF-8.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^7: how are ARGV and filename strings represented? by choroba
in thread how are ARGV and filename strings represented? by almr

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