I might yet do that for Class::InsideOut, but I don't think that's a really good long-term fix. A quick spin through Module;:CoreList shows 299 of 359 modules in the perl 5.8.8 core being new or changed since 5.8.0 -- who knows what kind of differences are lurking. Keeping track and finding/writing proxies anytime I use a core module is more headache than I'd like. I'd much rather be able to specify an up-to-date core module as a requirement and be done with it.