fix(geom_polygon): munch the closing edge in non-linear coords#1100
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A polygon is a closed ring, but its vertices only trace it open, so the edge from the last vertex back to the first was never subdivided by munch. In a non-linear coord that edge stayed a straight chord across a curved boundary. Repeat each group's first vertex before munching so the closing edge is subdivided like any other; linear coords are untouched.
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A polygon is a closed ring, but its vertices only trace it open, so the edge from the last vertex back to the first was never subdivided by munch. In a non-linear coord that edge stayed a straight chord across a curved boundary. Repeat each group's first vertex before munching so the closing edge is subdivided like any other; linear coords are untouched.