On Jan 28, 2014, at 10:14 PM, Kevin Smith <[email protected]> wrote:
>>
>>> This seems like something that can be deferred to ES7.
>>
>> Which "this"? .chain is deferred to ES7, and in V8 experimentally.
>
> Deferring `chain` is, if not future-hostile to `chain`, then
> "future-irritant".
>
> The way Promises are currently spec'd, the return value of the `then`
> callback is itself recursively unwrapped using `then`, rather than the more
> appropriate single-unwrapping of `chain`. Single unwrapping of the output
> side is consistent with the AP2 design principal that the provider does not
> determine the unwrapping policy.
>
> You cannot consistently implement AP2 without `chain` from the get-go. It is
> the primitive unwrapping function which `then` should be calling
Preaching to the choir. Andreas R. and I were talking about this after today's
meeting. So why isn't chain in the spec?
/be
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