typelevel/cats-effect v3.5.3 on GitHub

This is the forty-eighth 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

Optimize Dispatcher#unsafeRunAndForget by @kamilkloch in #3878
Execute IO.blocking on WSTP without BlockContext indirection by @armanbilge in #3903
Reset auto-cede counter after blocking by @armanbilge in #3938
Remove unneeded notifyParked when worker transitions to blocking by @armanbilge in #3937
Implement Fiber#join via asyncCheckAttempt by @armanbilge, @samspills in #3942

Bug Fixes

Fix cancelation leak in fromFuture, fromFutureCancelable by @TimWSpence in #3892
Fix #3898 for Dispatcher.parallel by @durban in #3900
Immediately surface fatal errors in IO.raiseError by @scott-thomson239 in #3811
Fix off-by-1 in CallbackStack#pack by @armanbilge in #3936
Prevent Hotswap#get from acquiring a lock when there is no Resource present by @josgarmar28 in #3922
Refactor CallbackStack based on new "pack locking" strategy by @armanbilge, @samspills, @mernst-github in #3943

Documentation

Fix starvation demo app in tuning guide by @armanbilge in #3881
Try to fix race condition in Hotswap example by @armanbilge in #3885
Add note to starvation docs re: cpus in k8s by @Daenyth in #3750
Add The Case For Effect Systems talk by @lenguyenthanh in #3905

Behind the Scenes

Update versions for 3.5.2 by @armanbilge in #3857
Release script improvements by @armanbilge in #3859
Post release to Discord in CI by @armanbilge in #3855
Tweak release notes config by @armanbilge, @samspills in #3951
Decrease concurrency/replicas in CallbackStackSpec by @armanbilge, @samspills in #3952
Update release.yml by @samspills in #3953
Document release process by @armanbilge, @samspills in #3954

New Contributors

@scott-thomson239 made their first contribution in #3811
@josgarmar28 made their first contribution in #3922

Full Changelog: v3.5.2...v3.5.3