related test262 case: https://github.com/tc39/test262/blob/142a6a6fbeb062f39bb0ca5cb73e9489de2b906d/test/built-ins/Set/prototype/symmetricDifference/set-like-class-mutation.js
Pull request: https://github.com/WebKit/WebKit/pull/27264
Committed 277526@main (4b16138ae6dd): <https://commits.webkit.org/277526@main> Reviewed commits have been landed. Closing PR #27264 and removing active labels.
<rdar://problem/126526845>