Reject boxed Symbols in structuredClone - #58213
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Summary:
The structured-clone polyfill rejects primitive Symbols but silently converts boxed Symbols to plain empty objects. Recognize Symbol wrappers and throw the expected
DataCloneErrorwithout coercing the wrapper to a string.Fixes #58212.
Changelog:
[GENERAL] [FIXED] - Reject boxed Symbol values in structuredClone.
Test Plan:
structuredClone(Object(Symbol())).structuredClone.yarn flow-check: 0 errors.git diff --checkpassed.No UI change; screenshots are not applicable.