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So what does it do better than C# 7's async/await?

Its more flexible and customizable, e.g. works with RxJava, CompletableFuture, JavaFX, Android... Moreover, you have more control where a coroutine is executed. https://kotlinlang.org/docs/reference/coroutines.html

Have you by any chance seen that I specifically mentioned version 7 of C#?

Which allows full control how async/await works, kind of like on the upcoming C++ co-routines, where async/await become syntactic sugar for blessed data structure.

EDIT: Should have provided the actual information.

The feature as introduced in C# 7 is called "Generalized async return types".

https://github.com/dotnet/docs/issues/1756

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