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TracingPlatform performs undefined behavior in JS that makes it unusable in Wasm

🪲 bug

Status: Open.

Bug

#4644 In typelevel/cats-effect;

· sjrd opened on Jul 26, 2026

MapAtomicCell

Status: Open.

#4635 In typelevel/cats-effect;

· vangogh500 opened on Jul 12, 2026

Integrated Selector: a ready I/O event can go undelivered for seconds while worker threads sit idle

🪲 bug

Status: Open.

#4628 In typelevel/cats-effect;

· sideeffffect opened on Jun 29, 2026

Resource.eval extra cancellation point

🪲 bug

Status: Open.

Bug

#4627 In typelevel/cats-effect;

· durban opened on Jun 28, 2026

Add Fiber#joinOrCancel

🍄 enhancement

Status: Open.

#4620 In typelevel/cats-effect;

· djspiewak opened on Jun 21, 2026

·  

v3.8.0

Converge on a single nomenclature for fiber blocking in docs

📚 docs

good first issue

Status: Open.

#4597 In typelevel/cats-effect;

· LukaJCB opened on May 5, 2026

Cirrus CI shutdown

⚙️ infrastructure

Status: Open.

#4590 In typelevel/cats-effect;

· durban opened on Apr 15, 2026

Queue.take.timeout(...) loses elements on cancelation

🪲 bug

Status: Open.

Bug

#4571 In typelevel/cats-effect;

· TomasMikula opened on Mar 19, 2026

Flaky DispatcherSpec on JS

Status: Open.

#4541 In typelevel/cats-effect;

· djspiewak opened on Dec 30, 2025

SIGPIPE during tests on scala-native

🪲 bug

Status: Open.

Bug

#4527 In typelevel/cats-effect;

· durban opened on Nov 23, 2025

TestContext on scala-native is not threadsafe

🪲 bug

Status: Open.

Bug

#4524 In typelevel/cats-effect;

· durban opened on Nov 18, 2025

·  

v3.7.next

Fork-with-finalizer method on GenSpawn

🍄 enhancement

Status: Open.

Feature

#4517 In typelevel/cats-effect;

· durban opened on Oct 21, 2025