Nick, any comment on my approach of changing the PolyModel's class via 
db.to_dict and creating a new model with the same key?  That seems to me 
like a relatively clean & safe way to do it.  The desire to be able to do 
this for my case, is to be able to move records from Person to User, then 
User to SuperUser, gaining extra fields needed as the person descends the 
hierarchy.  I suspect that's a fairly common scenario, and seems almost 
exactly the type of thing that PolyModel was designed for.

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