Some of that sounds a bit off. Taking just the first-
Fully support abstract methods in as much as a call to a non-overridden abstract (by design) method causes the code to croak or otherwise blow up
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The first is/was fairly trivial - via judicious use of a parameterised import routine initialising a package scoped hash and an AUTOLOAD routine using said package variable to categorise uncaught method calls.
Methods (object oriented code) should have no use for import, and AUTOLOAD is not for doing abstract parent methods. For those, you just write/stub the method with the croak/die/confess in it. That way any successful call has to have come from a subclass. Maybe you're doing something different but the way it sounds, it sounds like you're going about coding up your specs entirely wrong. :(
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