structuredClone accepts boxed Symbols as empty objects

Description

The React Native structuredClone polyfill correctly rejects primitive Symbols but treats boxed Symbols as arbitrary objects. structuredClone(Object(Symbol())) therefore returns {} instead of throwing, even though boxed Symbols are also not structured-cloneable.

Expected behavior

Boxed Symbols should throw DataCloneError, matching native structuredClone. The error path should not string-coerce the wrapper because Hermes throws a separate TypeError for that coercion.

React Native Version

0.87.1 and current main

Affected Platforms

JavaScript runtime - All

React Native の structuredClone polyfill から始め、Object(Symbol()) で問題を再現します。native structuredClone および既存の primitive-Symbol パスと動作を比較します。boxed Symbols がラッパーを文字列に変換せずに DataCloneError をスローし、既存のクローン動作が変わらない状態を完了とします。