Unhandled rejection tracking and native promises

[zloirock]

Most V8 Promise bugs (like 1 or 2) will be fixed in V8 ~ Chrome 49. Still not fixed V8 bugs are fixed in core-js by patching methods. It means custom unhandled rejection handlers will not work in Chrome 49 with core-js. The same situation with FF46. Some days ago promise rejection events was added to ECMAScript and HTML drafts.

So the question for the community: replace native Promise without support promise rejection events (in this case, in addition to global handlers, add generation custom events in browsers) or not?

Upd.: Ok. Chrome 49 supports unhandled rejection events.

Upd.: Because some other bugs, native Promise should be available only in V8 ~ Chrome 51.

[danharper]

Now that they're in the spec, +1 for replacing a native Promise which doesn't support the rejection events.

[zloirock]

Added to feature detection in 2.1.1.