The core modules are either there because (mini)perl needs to run them to generate/compile the main perl executable, or they are there because they are considered to be essential to any Perl installation. There also are modules whose inclusion was a bad choice in retrospect, but a deprecation process has only slowly been started.

I think the appropriate way is to create your own RPM for the updated module and install the updated module in lib/site/, so that it gets found before the old version under lib/. In addition, I would ask this question on p5p, as currently, there is a discussion on how to restructure and reorder the Perl installation directories, which will affect you once you distribute 5.12.

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