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This kind of reminds me of the story of promises in javascript, which are almost but not quite monads. Among other things, this has made implementing cancellation difficult. In addition, if it were monadic, the async/await syntax could have been trivially generalized to arbitrary monads. That would have been nice.

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You can get async / await for arbitrary monads in JavaScript using generator functions and coroutines.

Also, IxJS and RxJS provide some really nice sugar for working with higher-level abstractions around "pull" and "push" flows. The protocols associated with `Symbol.Observable` and `Symbol.asyncIterator` have small surface areas, so it's not difficult to hand-write implementations (using generators and async generators) to adapt code that wouldn't otherwise fit in the flow.

Thanks for the tip!

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