hex, showbase IO-manipulators do not work for int64 types on q[C]Debug

5.3.0
short via qDebug 0xf
foo: short via qCDebug 0xf
"short via QTextStream 0xf" 

int via qDebug 0xf
foo: int via qCDebug 0xf
"int via QTextStream 0xf" 

unsigned int via qDebug 0xf
foo: unsigned int via qCDebug 0xf
"unsigned int via QTextStream 0xf" 

long via qDebug 0xf
foo: long via qCDebug 0xf
"long via QTextStream 0xf" 

short via qDebug 0xf
foo: short via qCDebug 0xf
"short via QTextStream 0xf" 

unsigned __int64 via qDebug 15
foo: unsigned __int64 via qCDebug 15
"unsigned __int64 via QTextStream 0xf" 

__int64 via qDebug 15
foo: __int64 via qCDebug 15
"__int64 via QTextStream 0xf" 

template <class T>
void debugHexNumber()
{
    T n = 15;
    qDebug() << typeid(T).name() << "via qDebug" << hex << showbase << n;
#if QT_VERSION >= 0x050000
    qCDebug(lC)  << typeid(T).name() << "via qCDebug" << hex << showbase << n;
#endif
    QString m;
    QTextStream str(&m);
    str << typeid(T).name() << " via QTextStream "  << hex << showbase << n;
    qDebug() << m << '\n';
}