$ perl -MYAML::Syck -le 'print Dump { zip => "07102" }'
---
zip: 07102

##</code><code>##

$ perl -MData::Dumper -MYAML::Syck -le 'print Dumper Load Dump { zip => "07102" }'
$VAR1 = {
          'zip' => '07102'
        };

##</code><code>##

$ perl -MData::Dumper -MYAML::Syck -le '$YAML::Syck::ImplicitTyping=1;
print Dumper Load Dump { zip => "07102" }'
$VAR1 = {
          'zip' => 3650
        };