>
> I think F#'s cancellation approach is also worth mentioning in the
> discussion of alternatives as it has implicit but token-based automatically
> propagating cancellation.
>
If you have any good links to reference materials on F#'s cancellation
architecture, feel free to include them for future reference. I was unable
to find anything that clearly explained how implicit cancellation tokens
are discovered by child tasks, for instance.
I find implicit cancellation to be somewhat sketchy. For async functions,
it would mean that any await expression could potentially throw a
CancelError:
async function f() {
let a = await 1; // This could throw? What?
}
And there are certainly going to be scenarios where you *don't* want to
cancel a subtask. It seems to me that cancellation semantics are best left
to the async operation itself, rather than assuming "crash-and-burn".
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