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

Comienza localizando el React Native structuredClone polyfill y su gestión de memoria para la detección de ciclos. Reproduce un clon anidado desde un getter enumerable con una referencia circular externa y, a continuación, verifica que las llamadas reentrantes utilicen memoria independiente, mientras que la clonación ordinaria conserva su comportamiento.