I agree with everything you've said. jitpy is not so much competing in the numeric space (although it's not far from it), since Numba is as you say really good

I agree with everything you've said. jitpy is not so much competing in the numeric space (although it's not far from it), since Numba is as you say really good there. You do need to be able to build an abstraction boundary, such that complex classes never cross it, but nothing prevents you from instantiating a PyPy class and communicating to it though function calls. You'll probably want some way to share references across them, but that should be as simple as having a global mapping and a `Ref` class that cleans it up on destruction. Should be a few dozen lines of code.