As you can see from these test results:
this has had an unpatched bug report for ten years or so where it doesn't cope with sixty-four bit systems:
It's regrettable that people are using this as a dependence even now:
Another thing worth noting is that this module completely ignores Perl's Unicode encoding. Try commenting out the "use utf8;" in the following:
my $charset = 'UTF-8';
my $string = 'ÀÁÂÃÄÅＡあ';
print unac_string($charset, $string);
The output results will be identical.