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Ed Morley authored
* Add a test for the cryptography (cffi) compile step Since it's currently untested. * Skip vendoring libffi/libmemcached on Heroku-16 Unlike for Cedar-14, Heroku-16 comes with these packages pre-installed: https://github.com/heroku/stack-images/blob/5a341970cfc1f201014262ad64c3b3e47514f663/heroku-16/installed-packages.txt#L111 https://github.com/heroku/stack-images/blob/5a341970cfc1f201014262ad64c3b3e47514f663/heroku-16/installed-packages.txt#L172 As such the build scripts had already been made a no-op on Heroku-16: https://github.com/heroku/heroku-buildpack-python/blob/fedae5ceda5a42f594012f911c3808dd5dc6fd9e/builds/libraries/vendor/libffi#L6-L9 https://github.com/heroku/heroku-buildpack-python/blob/fedae5ceda5a42f594012f911c3808dd5dc6fd9e/builds/libraries/vendor/libmemcache#L6-L9 ...meaning the Heroku-16 archives for them on S3 contain zero files. However until now, the buildpack was still unnecessarily downloading and extrac...
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