Lazy is very powerful

• From my CPAN indexer (very abridged)
• http://git.jrock.us/?p=MetaCPAN.git;a=blob;f=lib/MetaCPAN/Distribution.pm;hb=HEAD

package Distribution;
has 'filename';
has 'destination';
# lazily extracts filename to a temp dir, and returns that

has 'manifest';
# looks in $self->destination for MANIFEST and returns parsed copy