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Now the overlap_y.geojson is fixxed. When 4 Elements were remaining the calculation of the intersection yielded a Point with y=-2.999999999 in the JS calculation it was -3. This is just a following problem seq1 has an inaccuracy. It should be 5.5
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It can be debugged by setting an breakpoint on L205 of PolygonCLipper with event queue.count == 4
We can use this or could look deeper into the intersection calculation if something can be fixxed there