RE: Node hierarchy. One ultimate direction is to use a DSL(for example python with typing info) as a way of declaring the node relations and fields and create generator util to generate the classes. The main challenge is to keep most of the data structures purely in C(so we can get ABI compatibility across languages). We do also want to keep some of the node base class and the possibility to declare node inside c++ for some private temp node. Which does not enjoy the cross-lang features but can make easy use of any language-specific data structure.
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