1. 2018-04-30 [5] [geos-devel] [GEOS] #867: Regression in union algorithm between GEOS 3.6 geos-devel GEOS 2. 2018-04-25 [2] [geos-devel] [GEOS] #866: OffsetCurve failure geos-devel GEOS 3. 2018-04-24 [1] [geos-devel] [GEOS] #865: ClipByBox2D failure geos-devel GEOS