d(`observer === globalObserver: ${observer === globalObserver}`);
        printlnBuffered(
            `list instanceof PerformanceObserverEntryList: ${
                list instanceof PerformanceObserverEntryList
            }`
        );

        const allEntries = list.getEntries();
        printlnBuffered(`allEntries instanceof Array: ${allEntries instanceof Array}`);
        printlnBuffered(`allEntries.length === 3: ${allEntries.length === 3}`);
        printlnBuffered(`allEntries[0] === startMark: ${a