Don't attempt to rasterize ARCs with very small sweep_angles, just resort to LINETO (#4112)
Don't attempt to rasterize ARCs with very small sweep_angles, just resort to LINETO (#4112)

naturalatlas/mapnik,tomhughes/mapnik,lightmare/mapnik,mapnik/mapnik,lightmare/mapnik,naturalatlas/mapnik,mapnik/mapnik,lightmare/mapnik,tomhughes/mapnik,naturalatlas/mapnik,lightmare/mapnik,mapnik/mapnik,naturalatlas/mapnik,tomhughes/mapnik,tomhughes/mapnik,mapnik/mapnik