Object.groupBy and Map.groupBy are not proposals anymore

[vinayraghu1]

Coming from a NextJS 14 app that didn't work properly in Safari 16 because they don't include the GroupBy polyfill.

This feature is widely supported since March 2024 across modern browsers. The MDN docs links to the core-js polyfill.

When I checked the docs, it looks like GroupBy is still under /proposals and all the polyfills next uses are /features. I assume this was never bumped. Happy to make a PR just didn't know where to start with the change.

[zloirock]

They were moved to stable features more than a year ago, #1306, you could add them to the NextJS polyfills list.