github typelevel/cats-effect v3.6.4
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This is the sixtieth release in the Cats Effect 3.x lineage. It is fully binary compatible with every 3.x release and fully source-compatible with the 3.6.x lineage. Barring critical security vulnerabilities, this will be our last release in the 3.6.x lineage, which also means this will be our last release targeting Scala Native 0.4.x.

Warning

Please note that Cats Effect 3.6.x is targeting Scala Native 0.4.x, which means it does not at present support native multithreading. This was a very intentional choice meant to give us an opportunity to break binary compatibility only on Scala Native if necessary when upgrading to Scala Native 0.5 and as we discover the impacts of the integrated runtime on the downstream ecosystem. It also reduces risk since Native multithreading in the runtime is a significant lift and we want to make sure we isolate that change from the already significant changes in 3.6.0. This functionality has already merged into the development branch and we plan to release it in 3.7.0 as soon as possible.

What's Changed

The most significant change in this release is a fix for a resource leak arising from timeouts on Resources. This was commonly experienced in applications built on top of Http4s and could have a number of negative consequences. An additional significant change is a full rewrite of parTraverseN and parTraverseN_, eliminating a class of pathological performance degradation when a traversal errors or is canceled. We have more work to do on this function, but that will be released in the 3.7.x line.

Enhancements

Bug Fixes

Documentation

Behind the Scenes

Full Changelog: v3.6.3...v3.6.4

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