Making the conversion of QPoint to QPointF explicit

When doing something like:

QPoint pt;
QPointF fPt;
QMatrix mat;
fPt = mat.map( pt );

the automatic conversion of QPoint to QPointF kicks in and this can cause a problem. By making the relevant constructor explicit and by providing a to...() function it could be prevented.

Answer from Trolltech:

In general we agree. The only problem is that making the constructor explicit will break a lot of code that expects exactly this behavior. Since we promised full source code compatibility in the Qt 4 series, this issue is now scheduled for Qt 5.