They don't play nicely with Data::Dumper or Storable
Yeah, but is that a bad thing? 'Data::Dumper' and 'Storable' only work by making assumptions on how objects are implemented - they assume the entire state can be captured by capturing the content of the referent. Which, in many OO circles, is seen as very bad programming. Not playing nice with someone who isn't playing nice isn't necessarely bad IMO.
They can have memory leaks (even Class::Std can under pathological circumstances)
What circumstances are those?
They are about 10x slower than hash- or array-based objects under average use
Do you have a benchmark? I'm not at all interested in the numbers - what I'd like to see is what you classify as "average use".
Extending the class on the fly is unintuitive
Really? How is extending the class when using inside-out objects any different from non inside-out objects? Or do you mean "I can't get at the data"? That seems to be the point Damian is making in his book, isn't?
Subclassing can still have bad situations
What do you mean by that? What is a "bad situation"?
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