Hi All,

   Dose GEOS supports buffer of self-intersected polygon, just like 'POLYGON 
((2 2,-2 -2,2 -2,-2 2,2 2))'. I get the wrong polygon result with 
GEOSBuffer('POLYGON ((2 2,-2 -2,2 -2,-2 2,2 2))',0.5,8). I use newest verion.
   Thanks.

Jiong
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