QTimeLine's update interval is not accurate on macOS

#include <QTimeLine>
#include <QTest>
#include <QSignalSpy>

class Test : public QObject
{
    Q_OBJECT
private slots:
    void signalEmission()
    {
        QTimeLine timeLine(1000);
        timeLine.setUpdateInterval(1); // ms
        timeLine.setFrameRange(0, 12);
        QSignalSpy spy(&timeLine, &QTimeLine::frameChanged);
        QVERIFY(spy.isValid());
        timeLine.start();
        QTRY_COMPARE( spy.count(), 12 );
        for ( int i = 0; i < 12; ++i ) {
            QCOMPARE( spy[i][0].toInt(), i + 1 );
        }
    }
};

QTEST_MAIN(Test)
#include "main.moc"