> > The difference would only surface when testing that case.
>
> Not quite. You can still have thenables that call `onFulfilled` with
> another thenable, to any depth. You can also insert a real promise at the
> end of any-length thenable chain.
I understand now. Essentially, in the test you create an ad-hoc "promise"
whose value is a promise, by virtue of it calling its `then` callback with
another promise.
So A+ 1.1 does present an opinion on `then` semantics for
promises-of-promises.
FWIW, I think the DOMFuture behavior is more intuitive in this particular
edge case. I also think that promises-for-promises are an edge case best
avoided at all costs.
{ Kevin }
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