Is is a harbinger of finally devendored libffi? Currently, CPython ships 1.20 (1998) while Debian LTS supplies 3.2.1 (2014).

libffi was de-vendored in 3.7 (Linux, BSD) and 3.8 (Windows). We only keep a copy for macos around.

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ctypes tests are failing on ARM64 macOS

I have no clue how the SDK stuff works on macOS. In order to land the PR I would need some assistance from @ned-deily or @ronaldoussoren . Or can we drop the SDK and use system-ffi on all system?

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I'll try to look at the PR over the weekend.

As a general statement I'd prefer to use the system install of libffi on macOS because Apple includes some magic in its version to ensure libffi closures work properly with their code signature system (in particular some magic to ensure that you don't need the "JIT" entitlement to use closures).

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