Try adding downgrade CI

[Technici4n]

I read this https://www.stochasticlifestyle.com/semantic-versioning-semver-is-flawed-and-downgrade-ci-is-required-to-fix-it/ and was curious to try it out. 😄

[Technici4n]

I'm not sure it's working. Warning: Could not use exact versions of packages in manifest, re-resolving could mean that the tests re-resolve the manifest anyway, thus updating beyond the "downgraded" deps.

[mfherbst]

Good idea. Can't you get the raw logs of the downgrade and a standard run and just diff the installation to see what effect it has. I could imagine one has to blacklist all standard library packages.

Another small tip: Since the number of CI runners is limited, in such experiments it would help to disable the other runners to free resources for other PRs :)