Incorrect documentation for fixing memory leaks

The "isMounted is an Antipattern" documentation article suggest avoiding memory leaks with makeCancelable, but this doesn't actually solve the issue since the callback is still referenced. The garbage collector does not understand that setting hasCanceled_ means that resolve will never be called, so it cannot release resolve or the references contained within. Even if it could, reject might also reference this, so memory leaks could still exist. Instead, makeCancelable should store the resolve and reject callbacks itself, and it should null them out on cancelation.

Another user pointed this issue out in https://github.com/facebook/react/issues/5465#issuecomment-287113777

Das betroffene Material ist der im Issue verlinkte Artikel „isMounted is an Antipattern“; beginne damit, sein makeCancelable-Beispiel und die darin referenzierte Diskussion zu prüfen. Aktualisiere die Dokumentation, sodass ihre Hinweise zu Speicherlecks technisch korrekt sind, und verifiziere anschließend, dass der Artikel die strittige Implementierung nicht mehr empfiehlt.