Ignore custom Map and Set iterators when cloning - #58223
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Summary:
The structured-clone polyfill traverses Map and Set with
for...of, invoking userSymbol.iteratoroverrides. Capture and call the built-inforEachintrinsics instead so cloning reads the collections' internal entries and performs no iterator override callback.Fixes #58222.
Changelog:
[GENERAL] [FIXED] - Ignore custom Map and Set iterators during structuredClone.
Test Plan:
structuredCloneignored it.yarn flow-check: 0 errors.git diff --checkpassed.No UI change; screenshots are not applicable.