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use Data::Dumper;
use DateTime;
use DateTime::TimeZone;
...
};

print Dumper($var);

$VAR1 = {
          'bigint' => Math::BigInt->new('0'),
...
          'tz' => DateTime::TimeZone::America::Chicago,
          'datetime' => rfc822('Wed, 03 Dec 2008 04:12:53 +0000')
        };