1. javascript built-in: finalizationregistry

  2. javascript built-in: finalizationregistry: `finalizationregistry()` constructor

  3. javascript built-in: finalizationregistry: register

  4. javascript built-in: finalizationregistry: register: non-registered symbol as target

  5. javascript built-in: finalizationregistry: unregister

  6. javascript built-in: finalizationregistry: unregister: non-registered symbol as target