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kotlinlang

:mega: :mega: :mega: `kotlinx.coroutines` 1.2.0 is here!

Changelog:
 * Kotlin 1.3.30
 * New API: `CancellableContinuation.resume` with `onCancelling` lambda to consistently handle closeable resources.
 * Flow improvements, including new operators, better documentation and RxJava integration. Note that it is not leaving its experimental status yet.

Full changelog: <https://github.com/Kotlin/kotlinx.coroutines/releases/tag/1.2.0>

Congrats. Could you give us more details about the reasons of « flatMap, merge and concatenate are replaced with flattenConcat, flattenMerge, flatMapConcat and flatMapMerge. » ?

The chief reason is that we have conflicting evidence on what `flatMap` is expected to do (should it concat or merge), so this way we can defer making this decision.

That's a possibility if in the end we decide that `flatMap` should do `flatMapMerge`. The downside of that decision is that if you copy-and-paste a code written with `Sequence` to `Flow` then suddenly it starts working differently, because `flatMap` for sequences is `flatMapConcat`.