This is Perl module Data::Compare::Type. INSTALLATION Type the following command: $ curl -L http://cpanmin.us | perl - Data::Compare::Type Or install cpanm and then run the following command to install Data::Compare::Type: $ cpanm Data::Compare::Type If you get an archive of this distribution, unpack it and build it as per the usual: $ tar xzf Data-Compare-Type-$version.tar.gz $ cd Data-Compare-Type-$version $ perl Makefile.PL $ make && make test Then install it: $ make install DOCUMENTATION Data::Compare::Type documentation is available as in POD. So you can do: $ perldoc Data::Compare::Type to read the documentation online with your favorite pager. LICENSE AND COPYRIGHT Copyright (c) 2012, S2. All rights reserved. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.