stage 4 tracking

[michaelficarra]

implementations

test results: https://test262.fyi/#built-ins/Iterator/prototype|v8_exp,sm_exp,jsc,qjs,libjs,chakra,graaljs,xs,rhino,babel

• Firefox (131): https://bugzilla.mozilla.org/show_bug.cgi?id=1568906
• Chrome (114 dev trial, 117 stable, unshipped, reshipped in 122): https://chromestatus.com/feature/5102502917177344
• Safari: https://bugs.webkit.org/show_bug.cgi?id=248650
• LibJS (July 2023): LibJS: Implement %IteratorHelperPrototype%.return SerenityOS/serenity#20057
• polyfill: es-iterator-helpers
• polyfill: core-js

other requirements

• tests: Iterator Helpers test262#2818
  • more tests from Mozilla: Add tests for recursively calling IteratorHelper generators test262#3865
  • avoid string wrapper tests: add tests for tc39/proposal-iterator-helpers#281 test262#3869
  • strengthening tests: update iterator helpers tests that passed even in noncompliant impls test262#3906
  • constructor and Symbol.toStringTag accessors: update constructor and Symbol.toStringTag properties on Iterator.prototype test262#3970
  • fix for the above: fix broken Iterator.prototype constructor/Symbol.toStringTag tests test262#3996
• slides: https://docs.google.com/presentation/d/1z9kpu_CITxmNls7aOn61uswOK1SqHqijngtMcDTo8zk
• ecma262 PR: Normative: add Iterator Helpers ecma262#3395

[michaelficarra]

Firefox shipping iterator helpers in 131: https://bugzilla.mozilla.org/show_bug.cgi?id=1896390

[michaelficarra]

Prepared the slides and 262 PR. Added to the agenda for advancement in October.