Coordinates are floats in general - but you do know that.

It really is an annoying bug :-) It stopped my entire borders of some elements (subgraphs or - I haven't checked yet for that being corrected by the change - nodes) not to be drawn.
Merge pull request #31 from VABAV/patch-1

Convert parsed polygon, polyline and B-spline coordinates to float.

Close issue #31