for each of the keys seen in the incoming hash
No, I would consider, that key list are known in advance, and Class hierarchy is predefined. But I guess I will need some framework to quickly map json keys to class attributes. See example I've posted in a comment above...

In reply to Re^2: Framework for making Moose-compatible object from json by nataraj
in thread Framework for making Moose-compatible object from json by nataraj

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