|Syntactic Confectionery Delight|
As for the importance of the id function, would you care to expand? ... I'd appreciate more insight into why I'm doing it
The real answer: Class::InsideOut expects/requires that the unique key for each object be its memory address (to ensure safety for threading and pseudoforks), so it provides the alias id() to Scalar::Util::refaddr.
To explain it in the primer, it may be sufficient to say that each object needs to have a unique key and Class::InsideOut requires the use of the id() function to generate that unique key.
I would discourage its use to anyone who didn't really know what they were doing.
I think this is almost exactly what you should say in place of "deprecated".
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In reply to Re^3: RFR: Inside-out classes - a Class::InsideOut primer