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…ile if derived class redefines self.keys
…nstance variables don't inherit so introspection wasn't working for derived classes. reintroduce to some metaprogramming.
…t of the functionality. much less metaprogramming.
coulda sworn i fixed this already. but there's wasn't a spec for it. oh well, fixed now.
(get rid of unnecessary local variable, make sure to use sym instead of string for instance_variable_set.)
(had over-eager flattening)