Reentrant structuredClone breaks outer circular references

Description

The React Native structuredClone polyfill reuses one module-global memory map under the assumption that cloning does not invoke user code. Enumerable property getters do execute, however, and can call structuredClone recursively. The inner call's finally clears the outer clone's memory, so later circular references are cloned again instead of pointing to the outer result.

Expected behavior

Each reentrant clone should have independent cycle-detection memory, while ordinary non-reentrant calls may retain the existing reusable-map optimization.

React Native Version

0.87.1 and current main

Affected Platforms

JavaScript runtime - All

まず、React Native structuredClone polyfill と、その循環検出におけるメモリ処理を特定します。列挙可能な getter から、外側に循環参照を持つネストされたクローンを再現し、その後、再入可能な呼び出しが独立したメモリを使用する一方で、通常のクローンが従来の動作を維持することを検証します。