Sourced from kotlinx-coroutines-core's releases.

1.4.3

General changes

• Thread context is properly preserved and restored for coroutines without ThreadContextElement (#985)
• ThreadContextElements are now restored in the opposite order from update (#2195)
• Improved performance of combine with 4 parameters, thanks to @​alexvanyo (#2419)
• Debug agent sanitizer leaves at least one frame with source location (#1437)
• Update Reactor version in kotlinx-coroutines-reactor to 3.4.1, thanks to @​sokomishalov (#2432)
• callsInPlace contract added to ReceiveChannel.consume (#941)
• CoroutineStart.UNDISPATCHED promoted to stable API (#1393)
• Kotlin updated to 1.4.30
• kotlinx.coroutines are now released directly to MavenCentral
• Reduced the size of DispatchedCoroutine by a field
• Internal class TimeSource renamed to SchedulerTimeSource to prevent wildcard import issues (#2537)

Bug fixes

• Fixed the problem that prevented implementation via delegation for Job interface (#2423)
• Fixed incorrect ProGuard rules that allowed shrinking volatile felds (#1564)
• Fixed await/asDeferred for MinimalStage implementations in jdk8 module (#2456)
• Fixed bug when onUndeliveredElement wasn't called for unlimited channels (#2435)
• Fixed a bug when ListenableFuture.isCancelled returned from asListenableFuture could have thrown an exception, thanks to @​vadimsemenov (#2421)
• Coroutine in callbackFlow and produce is properly cancelled when the channel was closed separately (#2506)

1.4.2

• Fixed StackOverflowError in Job.toString when Job is observed in its intermediate state (#2371).
• Improved liveness and latency of Dispatchers.Default and Dispatchers.IO in low-loaded mode (#2381).
• Improved performance of consecutive Channel.cancel invocations (#2384).
• SharingStarted is now fun interface (#2397).
• Additional lint settings for SharedFlow to catch programmatic errors early (#2376).
• Fixed bug when mutex and semaphore were not released during cancellation (#2390, thanks to @​Tilps for reproducing).
• Some corner cases in cancellation propagation between coroutines and listenable futures are repaired (#1442, thanks to @​vadimsemenov).
• Fixed unconditional cast to CoroutineStackFrame in exception recovery that triggered failures of instrumented code (#2386).
• Platform-specific dependencies are removed from kotlinx-coroutines-javafx (#2360).

1.4.1

This is a patch release with an important fix to the SharedFlow implementation.

• SharedFlow: Fix scenario with concurrent emitters and cancellation of a subscriber (#2359, thanks to @​vehovsky for the bug report).

1.4.0

Improvements

• StateFlow, SharedFlow and corresponding operators are promoted to stable API (#2316).
• Flow.debounce operator with timeout selector based on each individual element is added (#1216, thanks to @​mkano9!).
• CoroutineContext.job extension property is introduced (#2159).
• Flow.combine operator is reworked:
  • Complete fairness is maintained for single-threaded dispatchers.
  • Its performance is improved, depending on the use-case, by at least 50% (#2296).
  • Quadratic complexity depending on the number of upstream flows is eliminated (#2296).

... (truncated)

Sourced from kotlinx-coroutines-core's changelog.

Change log for kotlinx.coroutines

Version 1.5.0-RC

Channels API

• Major channels API rework (#330, #974). Existing offer, poll, and sendBlocking methods are deprecated, internal receiveCatching and onReceiveCatching removed, receiveOrNull and onReceiveOrNull are completely deprecated. Previously deprecated SendChannel.isFull declaration is removed. Channel operators deprecated with ERROR are now HIDDEN.
• New methods receiveCatching, onReceiveCatching trySend, tryReceive, and trySendBlocking along with the new result type ChannelResult are introduced. They provide better type safety, are less error-prone, and have a consistent future-proof naming scheme. The full rationale behind this change can be found here.
• BroadcastChannel and ConflatedBroadcastChannel are marked as ObsoleteCoroutinesApi in the favor or SharedFlow and StateFlow. The migration scheme can be found in their documentation. These classes will be deprecated in the next major release.
• callbackFlow and channelFlow are promoted to stable API.

Reactive integrations

• All existing API in modules kotlinx-coroutines-rx2, kotlinx-coroutines-rx3, kotlinx-coroutines-reactive, kotlinx-coroutines-reactor, and kotlinx-coroutines-jdk9 were revisited and promoted to stable (#2545).
• publish is no longer allowed to emit null values (#2646).
• Misleading awaitSingleOr* functions on Publisher type are deprecated (#2591).
• MaybeSource.await is deprecated in the favor of awaitSingle, additional lint functions for Mono are added in order to prevent ambiguous Publisher usages (#2628, #1587).
• ContextView support in kotlinx-coroutines-reactor (#2575).
• All reactive builders no longer ignore inner cancellation exceptions preventing their completion (#2262, #2646).
• MaybeSource.collect and Maybe.collect properly finish when they are completed without a value (#2617).
• All exceptions are now consistently handled according to reactive specification, whether they are considered 'fatal' or not by reactive frameworks (#2646).

Other improvements

• Flow.last and Flow.lastOrNull operators (#2246).
• Flow.runningFold operator (#2641).
• CoroutinesTimeout rule for JUnit5 (#2197).
• Internals of Job and AbstractCoroutine was reworked, resulting in smaller code size, less memory footprint, and better performance (#2513, #2512).
• CancellationException from Kotlin standard library is used for cancellation on Koltin/JS and Kotlin/Native (#2638).
• Introduced new DelicateCoroutineApi annotation that warns users about potential target API pitfalls and suggests studying API's documentation first. The only delicate API right now is GlobalScope (#2637).
• Fixed bug introduced in 1.4.3 when kotlinx-coroutines-core.jar triggered IDEA debugger failure (#2619).
• Fixed memory leak of ChildHandlerNode with reusable continuations (#2564).
• Various documentation improvements (#2555, #2589, #2592, #2583, #2437, #2616, #2633, #2560).

Version 1.4.3

General changes

• Thread context is properly preserved and restored for coroutines without ThreadContextElement (#985)
• ThreadContextElements are now restored in the opposite order from update (#2195)
• Improved performance of combine with 4 parameters, thanks to @​alexvanyo (#2419)
• Debug agent sanitizer leaves at least one frame with source location (#1437)
• Update Reactor version in kotlinx-coroutines-reactor to 3.4.1, thanks to @​sokomishalov (#2432)
• callInPlace contract added to ReceiveChannel.consume (#941)
• CoroutineStart.UNDISPATCHED promoted to stable API (#1393)
• Kotlin updated to 1.4.30
• kotlinx.coroutines are now released directly to MavenCentral
• Reduced the size of DispatchedCoroutine by a field
• Internal class TimeSource renamed to SchedulerTimeSource to prevent wildcard import issues (#2537)

... (truncated)

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