Bezier curves may be flattened to line segments ?

Hi everybody
i found this in the documentation of QPainterPath.united() function:
"Bezier curves may be flattened to line segments due to numerical instability of doing bezier curve intersections."but i need to unite two paths without flatten bezier curves to lines.
is there a way to do that??

Hi and welcome to devnet,
Please don't post the same question in different subforums, one is enough
"duplicate":http://qtproject.org/forums/viewthread/31217/