They have been trying to improve the exact specification of RPython since David Beazley sorta called the project out on the fact that, for a time early in the d

They have been trying to improve the exact specification of RPython since David Beazley sorta called the project out on the fact that, for a time early in the development of PyPy, RPython was basically whatever subset of Python survived the PyPy build process. The 2012 PyCon keynote gives and awesome explanation of the project internals and its promise: https://www.youtube.com/watch?v=l_HBRhcgeuQ https://www.youtube.com/watch?v=l_HBRhcgeuQ