QTextStream::setRealNumberPrecision sets number of digits, not fraction digits

https://doc.qt.io/qt-6/qtextstream.html#setRealNumberPrecision

"Sets the precision of real numbers to precision. This value describes the number of fraction digits QTextStream should write when generating real numbers."

However, it appears to set the number of digits, rather than fraction digits (which should be the number of digits after the decimal place).

E.g:

        QTextStream out(&file);
        out.setRealNumberPrecision(6);
        double f = 12.34567890;
        out << f;

Outputs 12.3457, not 12.345679.