POC: plugging the cancelable leak
#3491
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Implements a proof-of-concept for my proposal in #3474 (comment).
To re-iterate:
IO.Cancelable[+A](ioa: IO[A], cancel: IO[Unit])is now a primitive operationCancelable, it exposes itscanceloperation as part of thefiber.cancel.uncancelablesemantics, this guarantees that the final result ofioa(be it success, error, or cancellation) will always be propagated.As such, it plugs the leak.