VisualizationLibrary
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Allow vl::Object user data to be of any class for proper casting
VL_OBJECT_USER_DATA only allows to a vl::Object to point to a void*, it would be nice to have the option to be a user specified base class so that proper dynamic casting can be used when retrieving data. It has to be a naked pointer though.
This will be a breaking change as the meaning of the define will change.