Re: [whatwg/fetch] Aborting a fetch: The Next Generation (#447)

> an object which is a promise that has a `cancel` method but no chaining at all
> 
> ... also has a `then`.

What does it mean for an object (promise?) to have a `then(..)` method but not allow chaining? Do you mean it would be a `then(..)` that returned `undefined` instead of another promise?

Sounds pretty troublesome to conceive of a "thenable" that doesn't actually conform to A+ semantics for thenables -- remember we sold ourselves to thenable duck typing.

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