Killing `Promise.fulfill`

Tab Atkins Jr. jackalmage at
Wed Aug 21 19:15:22 PDT 2013

On Wed, Aug 21, 2013 at 7:13 PM, Domenic Denicola
<domenic at> wrote:
> From: Tab Atkins Jr. [mailto:jackalmage at]
>> Unless you wanted promise-likes to return fresh objects too?
> Yes, that is largely the use case for `Q`/``/whatever. Handing it untrusted input, possible a non-promise, possibly a promise-like, possibly a promise, and getting back a trusted promise.

Okay, that makes sense.

>> The only way to have a completely reliable type test is to use a WeakSet to keep track of instances
> I believe this is what Mark's makeQ.js does.
>> Do you consider WeakMaps sufficient for polyfillability?
> I believe makeQ.js uses a WeakMap polyfill, so yes.



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