Stage 4 tracking

[bakkot]

This proposal achieved stage 3 at the May 2023 meeting. This is a tracking issue for getting stage 4.

• committee consensus
• open PR to the spec - PR
  • editors have approved the PR
• write test262 tests - issue, PR
  • merge test262 tests
• at least two implementations
  • JavaScriptCore - issue, PR, shipping in 18.2
  • V8 - issue
  • SpiderMonkey - issue (shipped in 129)
• significant in-the-field experience

[ljharb]

I've published https://npmjs.com/math.f16round, fwiw (i realize that for this proposal engine implementations are what's needed, though)

[linusg]

Implemented in Kiesel, thanks @sno2!

[petamoriken]

V8 and SpiderMonkey are implemented it behind the flags.

It appears to be enabled by default in Firefox 129.
https://groups.google.com/a/mozilla.org/g/dev-platform/c/2LViBkDMtdk/m/cuLcpt_8AgAJ

[annevk]

FYI: https://developer.apple.com/documentation/safari-release-notes/safari-18_2-release-notes

[eliassjogreen]

It's been implemented in the Nova JS engine: trynova/nova@99b1b13

[DevSDK]

(v8) It's been approved by the blink-dev group API owners.

We expect it to be enabled by default on Chrome M135.

https://chromestatus.com/feature/5164400693215232

[petamoriken]

Since it has already been incorporated into ECMA262, it would be better to archive this repository.