> a clean implementation and no compatiblity hacks

Ignoring the minor typo, this statement will cause some in the audience to frown ;) The value of an implementation like this is the compatibility hacks. Maybe take a few leaves out of the PyPy/HPy book.. PyPy has been amazing from the outset, but only a fraction of the community have been able to use it because the compatibility story initially was very weak. 15 years later and it's still not quite there, and consequently neither are the users.