QVariant: both canConvert() and convert() return 'true' when it shouldn't

const QString s = QStringLiteral("1685965936385");
QMetaType target = QMetaType::fromType<int>();

QVariant v(s);
if (v.canConvert(target) && v.convert(target)) // it's TRUE (but why?)
    QCOMPARE(v.toString(), s); // FAILED!