Intent to ship: Promise.allKeyed (Await Dictionary)

[Cornelius]

As of Firefox 155, I intend to turn Promise.allKeyed on by default. It has been developed behind the javascript.options.experimental.promise_allkeyed preference.

summary;

This adds a new Promise.allKeyed method that takes an iterable of promises and returns a single Promise that resolves when all of the given promises have resolved, preserving the key-value mapping.

The bug to turn on by default:
https://bugzilla.mozilla.org/show_bug.cgi?id=2057270

Specification:

https://tc39.es/proposal-await-dictionary/

Standards Body:
TC39

Platform Coverage:
All

Preference:

javascript.options.experimental.promise_allkeyed

DevTools Bug:
N/A

Extensions Bug:
N/A

Use Counter:
N/A

Standards-Positions Discussion:
N/A

Other Browsers:
Blink: N/A
Safari: N/A

web-platform-tests:
Covered by Test262. The tests are already present in our tree (e.g., js/src/tests/test262/built-ins/Promise/{allKeyed/allSettledKeyed}). We will ensure we have the latest Test262 import before shipping.

[Daniel Minor]

Cornelius felt strange about thanking himself, but I'd like to point out that he is a volunteer, and did great work implementing this proposal. Thanks Cornelius!

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