resolve()/reject() on Promise subclasses and @@species

C. Scott Ananian ecmascript at
Thu Nov 5 04:22:01 UTC 2015

The spec has been implemented as is by both `es6-shim` and `core-js`, and
there are plenty of users of these.  So it's not correct to say that it
hasn't been implemented yet; folks aren't waiting for the browsers.

The differing behaviors in the null-or-undefined case should probably be
remedied, at least.

But I am in favor of making a change to all/race to move them away from
@@species, see my previous message for the exact wording proposal which
changes step 6.  I'd appreciate comments on that.
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