@vectorstyler: I discussed it with Taras, my colleague. I think you should hold on the implementation of Tangent node. He agrees with me that it is just a matter of introducing a single new flag for each of the existing nodes rather than introducing a whole new node type. It is far more elegant, far simpler. Meanwhile, you can just work on getting the two main node types right. Sharp (&Cusp) and Smooth (&Symmetric).
