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$ perl -V:ptrsize ptrsize='8'; $ perl -MConfig -wE'say $Config{ptrsize}' 8 $ perl -MData::Peek -MConfig::Perl::V -we'DDumper (Config::Perl::V::my +config ()->{config})'
{ alignbytes => 8, api_subversion => 0, ... version => '5.14.2', version_patchlevel_string => 'version 14 subversion 2' }