Hi Mika,
Do you have any plans to also add a robust buffering function? You asked this to Luke and I saw his answers but here also an answer from our side.
Yes, we've planned a buffer algorithm in the near future. I'm currently busy with self-intersections, which have to be addressed by the buffering. Then the buffer algorithm might be implemented for a geometry. Buffering is special in that sense that buffering one polygon can have a different output from buffering two polygons. So besides the buffer(polygon) you'll probably also need a buffer algorithm on a collection. Same for linestrings, points. As also described in the PDF-link you gave. Other issues are buffer-outside, buffer-inside, holes which might disappear. And multi geometries (of course related to the collection). Regards, Barend