Locale tests may fail (0.7.9)

[eserte]

See http://matrix.cpantesters.org/?dist=Sort-Naturally-XS%200.7.9;os=linux;reports=1 for a list of fail reports --- it seems that all of the current linux fail reports are locale-related. Sorry, I don't have more information why it fails on some of my smokers.

[andk]

Thread-safe locale handling was introduced to perl in commit Perl/perl5@e9bc6d6b34, also known as v5.27.8-303-ge9bc6d6b34. Since then the test https://metacpan.org/release/SERVAL/Sort-Naturally-XS-0.7.9/source/t/Sort-Naturally-XS-sorted.t#L110 fails in threaded perls, iff the locale en_CA is installed.
I have patched my copy of the test to provide more diagnostics on the failing test. The pseudo-patch:

            my $ar_ca_local__expected = [qw/A a B b C c/];
            my $ar_ca_local__actual = sorted($ar_en_local, locale => $locale);
   -        ok(eq_array($ar_ca_local__expected, $ar_ca_local__actual), 'Locale CA test');
   +        ok(eq_array($ar_ca_local__expected, $ar_ca_local__actual), 'Locale CA test')
   +            or diag explain { actual => $ar_ca_local__actual, expected => $ar_ca_local__expected };
        }

This gives the following output:

   #   Failed test 'Locale CA test'
   #   at t/Sort-Naturally-XS-sorted.t line 110.
   # {
   #   'actual' => [
   #     'a',
   #     'A',
   #     'b',
   #     'B',
   #     'c',
   #     'C'
   #   ],
   #   'expected' => [
   #     'A',
   #     'a',
   #     'B',
   #     'b',
   #     'C',
   #     'c'
   #   ]
   # }