#!/usr/bin/perl

use strict;
use warnings;
use utf8;
use Devel::Peek;
use Data::Dumper;
$Data::Dumper::Useqq = 1;

my %hash = (
    'clé' => 0,
);
my $key = (keys %hash)[0];
Dump($key);
print Dumper($key);

$hash{'clé'} = 1;
$key = (keys %hash)[0];

Dump($key);
print Dumper($key);

utf8::upgrade($key);
Dump($key);
print Dumper($key);