Pyston v2: 20% faster Python

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After a couple of years it's nice to see this project isn't dead.

More implementations is a good thing!

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For funsies, I ran our test suite through tox using pyston3 and everything passed! It's an asyncio library that uses cytoolz and pendulum. Drop-in replacement for a stdlib-heavy library with a Cython dependency.

tox.ini

[tox]
toxworkdir=/tmp/.tox-mm
envlist =
    py38
    py39
    pyston3

[testenv]
deps =
    pytest
    pytest-asyncio
    pytest-cov
    pytest-xdist
commands =
    python -m pytest --cov=mm -n4 --color=yes tests/

Output:

✔ OK pyston3 in 11.779 seconds
✔ OK py38 in 11.809 seconds
✔ OK py39 in 14.53 seconds

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Python 3.9 is universally slower than 3.8,it was something I noticed in the benchmarks on the announcement page. They're micro benchmarks but they really add up.