Intent to Ship: at() relative indexing

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Tom Schuster

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May 3, 2021, 11:30:01 AMMay 3
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The at() method was added to JS indexable objects like Array. We can
finally ship this after various web-compat issues, recently:
https://github.com/tc39/proposal-relative-indexing-method/issues/41

Bug(s): https://bugzilla.mozilla.org/show_bug.cgi?id=1681371

Proposed Standard: https://tc39.es/proposal-relative-indexing-method/
Proposal Repository: https://github.com/tc39/proposal-relative-indexing-method

MDN:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/at
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/at
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/at

Platform coverage: all platforms

DevTools Bug: not applicable

Other Browsers: Chrome plans on shipping in 92

Testing: Test262 Tests
https://github.com/tc39/test262/pull/2905 and others

Secure contexts: These are JS builtin functions and is therefore
present in all contexts.
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