Am I missing something when optimal_convex_partition_2 fails?

[mmertama]

Am I missing something? The [optimal_convex_partition_2 fails with very simple polygon
#8828](#8828) was closed as "-384,-448,-384,-448 is a duplicated point making the is_simple precondition failing", but I dont see such points in the input data:

-640,-160,
-640,-384,
-448,-384,
-448,-448,
-320,-448,
-320,-384
-128,-384,
-128,-152,
-128,-128,
-128,0,
-128,24,
-128,256,
-320,256,
-448,64,
-320,64,
-320,-192,
-448,-192,
-512,-192,
-512,-160

... in the test application you can see

assert(polygon.orientation() == CGAL::Orientation::COUNTERCLOCKWISE);
assert(polygon.is_simple());

before calling optimal_convex_partition_2 and therefore data should be ok.