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Closes #20
Some specs are failing, same finding as #20 (comment) probably because of a version change.
I didn't dig deeper but mark them as pending so at least the current ones are checked on ci.
I also wanted to add builds on macos, but I stumble on some error in https://github.com/crystal-community/zeromq-crystal/actions/runs/6210735524/job/16859265992 and decided to keep only ubuntu-latest