AutoBean polymorphism support

Hi all,
I am developing an app in which I use (or at least I would like to use) AutoBeans for serializing data. Unfortunately it seems to me that polymorphism is not supported i.e., I lost the concrete type once I deserialize the json in client-side, only the Base supertype is available.
I looked everywhere but I haven't found some concrete answer, so I hope someone has already faced (and why not, solved) this problem.
I created a really simple testcase that can be found on https://gist.github.com/3884099

I know AutoBean is behind RequestFactory so I though it supports polymorphism as well. I don't want to rely on RF as I do not need such complexity, I just simply need a way to serialize beans using AutoBean, but polymorphism is a must.

Is is even achievable? Hope someone can help.

Thanks in advance,
Andrew.

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