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

Beginne damit, das React Native structuredClone polyfill zu lokalisieren und zu prüfen, wie es mit Error.cause umgeht. Vergleiche sein Verhalten mit Node's nativem structuredClone und ergänze Tests, die rekursives Klonen, beibehaltene zirkuläre/gemeinsam genutzte Identität, den nicht aufzählbaren Deskriptor und falsy causes zeigen.