[syastrov]

Kudos for open-sourcing it. Here’s to hoping some of the changes make their way into upstream CPython.

What’s the compatibility story like? Is there a list somewhere of unsupported features?

[gostsamo]

Full compatibility but the C-extensions must be rebuild for some libraries like PyTorch.

[kmod]

https://github.com/pyston/pyston/wiki/Semantic-changes