I've read your code attentively, now I want to ask a few questions please. Here: 
...
   D => {
      E => {
         F => 'G'
      }
   },
##   Z => 'G', # Duplicate test
...

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If I'll uncomment 'Z' key there will be a warning thrown about duplicate 'G' key. But 'G' is not a key here, it's keys value.

And here: 
##   X => [1,2,3], # Bad type test

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Why arrayref is a bad type?

And the last one: I tried to add mutators to your code through assignment the lvalue attribute to _derefernce sub but it has no effect =( Any ideas of how can I do this?

In reply to Re^2: Generating accessors for complex structures inside the object by KSURi
in thread Generating accessors and mutators for complex structures inside the object by KSURi

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