v3.5.5

This is the fiftieth release in the Cats Effect 3.x lineage. It is fully binary compatible with every 3.x release and fully source-compatible with every 3.5.x release.

Warning

The 3.5.x series contains some changes that may be semantically breaking with respect to earlier 3.x releases. If you're using fs2, http4s, or other libraries from the ecosystem, make sure you've upgraded to versions of these libraries that are compatible with this release (for fs2, that's 3.7.0+, for http4s it's 0.23.19+)!

Additionally, if you're using methods like fromFuture, make sure you're aware of the major changes to async, described in these release notes.

What's Changed

Enhancements

• Dispatcher: avoid spinning by @durban in #4052
• Relax access semantics in MapRef implementations by @armanbilge in #4116
• optimize IO.whenA by @Jasper-M in #4135

Bug Fixes

• Fix #4066: shut down executors when IORuntime.global shuts down by @durban in #4067
• Use IOApp#reportFailure instead of printStackTrace() for blocking EC by @fredfp in #4044
• Fix cancelable to guarantee cancelation by @armanbilge in #4118

Documentation

• Update versions for 3.5.4 by @djspiewak in #4032
• Improve contributor documentation by @durban in #4038
• Expand the example of using Random[F] in the doc for 3.5.x by @sshark in #4041
• Document usage of -Wnonunit-statement by @froth in #4054
• link to MapRef docs in site sidebar by @samspills in #4122
• Add lifecycle diagrams to Supervisor web docs by @samspills in #4127

Behind the Scenes

• Fix CI step to post release to Discord by @armanbilge in #4031
• Create 8-core Cirrus CI job by @armanbilge in #4036
• Try to address DispatcherSpec timeout in CI by @durban in #4057
• Pin CI to macOS 12 by @armanbilge in #4078
• Remove GraalVM from CI matrix by @mzuehlke in #4153

New Contributors

• @sshark made their first contribution in #4041
• @fredfp made their first contribution in #4044

Full Changelog: v3.5.4...v3.5.5