Re: CompletableFuture.cancel vs Future.cancel bug?

> If anyone out there is implementing Future or a similar API from scratch,
> though, I wanted to at least encourage you to implement cancel(...)'s
> return value according to the current docs
>

Looks like Google guys see this spec the same way as I do.

Probably for Guava it would make sense to have an utility method in Futures
like :

public static boolean cancel(Future<?> f) {
     if (f instanceof CompletableFuture)
           return !f.isDone() &&
((CompletableFuture)f).completeExceptionally(new CancellationException());
     else
           return f.cancel(true);
}

Though, I don't see any clean workarounds for ForkJoinTask except dirty
magic with reflection/unsafe or by abusing compareAndSetForkJoinTaskTag()
method.

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