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versioning is broken (Score:1)
The basic problem is that putting the burden of "what version can I use?" on the user is broken. By user I mean author of a module which uses another module. The library maintainer knows far more about compatibility than the average user and so the library maintainer should be able to publish that information (out of band).
This post [blogspot.com] goes quite a bit further (probably too far for Perl). I actually implemented the engine for the abstract stuff in that post but the most important aspect is actually the interface. How to allow people to express compatibility without breaking their wrists or their brains.
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