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Support for bound actions referencing derived resource types
In the current framework a runtime type-mismatch exception occurs when invoking a bound action using a reference to an instance of a derived type.
For example, a Rate action bound to a Movie cannot be invoked on instances of derived types such as ActionMovie or MysteryMovie in the Movies resource set.
Parameter type matching should be enhanced to accept a reference to a derived type as a reference to a base type (type covariance).