> This libffi upgrade also completely breaks all use of Wayland on > aarch64.
No, this is likely #1022232, which is now being fixed in 3.4.3-4. This issue which I see here is not yet reproducible upstream. Once you rebuild python with the 3.4.3 uploads, the tests start passing again.
I'm waiting for the autopkg tests with 3.4.3-4. If that's not resolved until then, we either need to add an aarch64 specific breaks list, or rename the libffi8 package to libffi8-1.
