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Embedded-hal v1.0 has now officially released 🎉 (migration guide blog-post)
pca9535 has already updated to rc2 but rc3 made some changes to the IO traits which might need some general adjustments of the pca9535 crate architecture. Also the general architecture of the crate needs to undergo a check to make sure the crate integrates well into embedded-hal 1.0. One thing that comes to mind is that things like shared-bus are now discouraged to use (looks like only for SPI bus though) so I need to make sure pca9535 works well with the new approaches.