I've been converting an old, badly designed set of Perl classes to Moose, and it's actually been fun. I split the old classes up into a number of sub-objects, but was able to maintain the silly old interface with "handles", forwarding the calls to the appropriate class.
If you work with Perl and haven't tried Moose yet, you're missing something. The current three classes are 67 pages of printed Perl. I estimate that I'll end up with maybe 6 or 7 classes and probably no more than 20 pages.
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