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
  • [ ] editors have approved the PR
• [x] write test262 tests - issue, PR
  • [x] merge test262 tests
• [ ] at least two implementations
  • [ ] JavaScriptCore - issue
  • [ ] V8 - issue
  • [x] 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