GeoML is currently still in developpement, and have not been tested -nor proved, nor model-checked nor analyzed ... but you know what we say about well typed program ;) -. Thereby, you might find some weird behaviors or failures. Feel free to let us know or report an issue about it. The modules Point, Line, Rectangle, Vector, Triangle, Segment, Circle are pretty much usable (bug free?) while the Polygon, Polyhedron, Curve, Ellipse, Shape ... modules are not quite ready to be used and you should not rely on the code in it. You are also welcome to contact any member of the developpement team if you want to suggest a feature you think it may be cool to have in GeoML.