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M1 support for PyPy

The PyPy team is happy to announce that we can now target the macOS ARM64 platform. Much of the work was executed by Maciej Fijałkowski (fijal) and funded via a generous contribution to our OpenCollective. The work is based on our existing support for aarch64 (arm64 on linux) with some twists to support the differences between the CPUs and the operating system. There are nightly builds for pypy3.8 and pypy3.9 (look for macos_arm64), and the architecture will be part of our next release.

Please try it out and let us know how it is useful for you or how we could improve.

We still need help improving our macOS support. We have an open issue to help our packaging story. Help is welcome.

The PyPy team.