[webkit-dev] Request for position: relative indexing method on JS indexables

[Shu-yu Guo]

Hi all,

This is a request for the WebKit position on the TC39 relative indexing
method proposal, which has been at Stage 3 since September 2020. It was
initially named `.item`, but due to web incompatibility with the YUI
library and Flickr, it was renamed in November 2020 to `.at`, pending
further web incompatibility data.

Chrome would like to ship ASAP to gather said incompatibility data.

- Proposal: https://github.com/tc39/proposal-relative-indexing-method
- Specification: https://tc39.es/proposal-relative-indexing-method/
- ChromeStatus: https://chromestatus.com/feature/6123640410079232

Cheers,
Shu-yu Guo, V8
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