Hey Shu, This is already implemented behind the JSC runtime option `useAtMethod`. (Latest relevant revision is r270005<http://trac.webkit.org/r270005>.) Looking forward to seeing whether the new name is in fact web-compatible. 🤞 Ross ________________________________ From: Shu-yu Guo via webkit-dev <webkit-dev@lists.webkit.org> Sent: Monday, November 30, 2020 5:04:02 PM To: webkit-dev@lists.webkit.org <webkit-dev@lists.webkit.org> Subject: [webkit-dev] Request for position: relative indexing method on JS indexables 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