There were a couple of different things that prevented us from publishing working universal2 wheels: We’re using cibuildwheel to build the wheels, and that understands how to cross-compile things, but since part of the extension is written in Go and needs to be compiled with CGo, some additional tweaks were needed to make sure the compiled bit was coming out for the correct architecture. I went ahead and bumped the version to 1.0.0 because there was no reason not to; I consider the code to be feature-complete, I am reasonably certain that everything works as intended, and I have no plans to break the API in the foreseeable future.