This is amazing -- we have a small mountain of Cython code, and almost everything is working out of the box!

Tests failing:

* https://github.com/explosion/spaCy

Confirmed working:

* https://github.com/explosion/thinc

* https://github.com/explosion/preshed

* https://github.com/explosion/cymem

* https://github.com/explosion/murmurhash

I doubt spaCy will ever be faster on PyPy (the neural network library Thinc is currently 50% slower). It'd still be really great to get it running, so people who benefit from PyPy for other parts of their stack don't have to manage two Python environments.