Re: [fetch] Aborting a fetch (#27)

@petkaantonov Sounds like you get it will *never* cancel `impossibleToIgnoreCancellableFunction`. Now assume, in a future version, I update `foo` to no longer use a chain internally. Suddenly it will *always* cancel `impossibleToIgnoreCancellableFunction`. This is [action at a distance](https://en.wikipedia.org/wiki/Action_at_a_distance_%28computer_programming%29) at its most exquisite.

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