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void CascadeClassifier::detectMultiScale( InputArray image,
calls 
 
void clipObjects(Size sz, std::vector<rect>& std::vector<Rect>& objects,
std::vector<int>* a, std::vector<double>* b)
{
size_t i, j = 0, n = objects.size();
Rect win0 = Rect(0, 0, sz.width, sz.height);
if(a)
{
CV_Assert(a->size() == n);
}
if(b)
{
CV_Assert(b->size() == n);
}
}
  
///.....///.....

A and b are rejectLevels and weights. It looks like this code is attempting to fix rectangles going outside image bounds(in 2.4 I remember tossing out illegal rects). This assert throws when I don't rejectLevels/Weights use rejectLevels/Weights, but detectedObjects, which is n detectedObjects is > 0. 0 and I use detectedObjects. Don't think this is right.