QTest mouse events are delivered to the center of the window even when pos 0,0 is specified

Bug description:
Specifying QPointF(0,0) as arugment of QTest::mouseMove sends a move to the center of the window

From the documentation:
http://doc.qt.io/qt-5/qtest.html#mouseMove-1
"If pos is not specified, the mouse pointer moves to the center of the window."

The problem is
https://github.com/qtproject/qtbase/blob/5.7/src/testlib/qtestmouse.h#L167
uses "if (pos.isNull())" which is basically "if x==0 and y==0"
so passing a pos of 0,0 is like not passing it at all.

Additional concerns:
am I wrong thinking that this prevents you from sending events to the top-left corner of your window?