unsubscribeFromListedMetas(subscriber, metas) {
        const toDelete = [];

        for (const meta of metas) {
            meta.subscribers = meta.subscribers.filter(registeredSubscriber => {
                return registeredSubscriber !== subscriber;
            });

            if (meta.subscribers.length === 0) {
                toDelete.push(meta);
            }
        }

        this.subscribers = this.subscribers.filter(subscriber => {
            return !toDelete.includes(subscriber);
        });
    }
@private
@param {import("./AttributeSubscriber")} subscriber
@param {Array<AttributeSubscribersMeta|any>} metas