structuredClone preserves Error cause references and drops falsy causes

Description

The React Native structuredClone polyfill passes Error.cause through by reference instead of cloning it, and only copies the property when its value is truthy. Object causes therefore remain shared with the input; a circular cause points back to the original Error; and valid falsy causes such as false disappear.

Expected behavior

An own cause property should be cloned recursively, retain its non-enumerable Error property descriptor, preserve circular/shared identity within the clone, and keep falsy values. Node's native structuredClone follows this behavior.

React Native Version

0.87.1 and current main

Affected Platforms

JavaScript runtime - All

Inizia individuando il polyfill di structuredClone di React Native e controlla come gestisce Error.cause. Confronta il suo comportamento con quello di structuredClone nativo di Node, quindi aggiungi una copertura che mostri la clonazione ricorsiva, l’identità circolare/condivisa preservata, il descrittore non enumerabile e le cause falsy.