shiboken issue converting Python3 int (which might be long integer)

Shiboken seems to be confused when Python3 int are actually long.

item = QGraphicsRectItem()
item.setData(QGraphicsItem.UserType, 1)

works correctly, but

item = QGraphicsRectItem()
item.setData(QGraphicsItem.UserType, 1<<32)

raises an exception OverFlowError with the following message in the console:

RuntimeWarning: libshiboken: Overflow: Value 4294967296 exceeds limits of type  [signed] "i" (4bytes)