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kotlinx.coroutines v1.4.0 Release Notes

  • 👌 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).
      • crossinline and inline-heavy internals are removed, fixing sporadic SIGSEGV on Mediatek Android devices (#1683, #1743).
    • 🐎 Flow.zip operator performance is improved by 40%.
    • 🗄 Various API has been promoted to stable or its deprecation level has been raised (#2316).

    🐛 Bug fixes

    • 👻 Suspendable stateIn operator propagates exception to the caller when upstream fails to produce initial value (#2329).
    • 🛠 Fix SharedFlow with replay for subscribers working at different speed (#2325).
    • 🔒 Do not fail debug agent installation when security manager does not provide access to system properties (#2311).
    • Cancelled lazy coroutines are properly cleaned up from debug agent output (#2294).
    • BlockHound false-positives are correctly filtered out (#2302, #2190, #2303).
    • 🛠 Potential crash during a race between cancellation and upstream in Observable.asFlow is fixed (#2104, #2299, thanks to @LouisCAD and @drinkthestars).