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

Commencez par localiser le React Native structuredClone polyfill et sa gestion de la mémoire pour la détection des cycles. Reproduisez un clone imbriqué à partir d’un getter enumerable avec une référence circulaire externe, puis vérifiez que les appels réentrants utilisent une mémoire indépendante, tandis que le clonage ordinaire conserve son comportement.