And just to remind us "how quickly things change:"

From Internal Changes in 5.12.0

"

• The internal structure of the dual-life modules traditionally found in the lib/ and ext/ directories in the perl source has changed significantly. Where possible, dual-lifed modules have been extracted from lib/ and ext/.
  
  Dual-lifed modules maintained by Perl's developers as part of the Perl core now live in dist/. Dual-lifed modules maintained primarily on CPAN now live in cpan/. When reporting a bug in a module located under cpan/, please send your bug report directly to the module's bug tracker or author, rather than Perl's bug tracker.

"