I don’t understand why all points are considered external.
issue.gh (9.1 KB)
Brep.IsPointInside determines “if point is inside a Brep. This question only makes sense when the brep is a closed and manifold.”
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Oh, I see, thanks.
No worries, you’re probably looking for one of these:
https://developer.rhino3d.com/api/RhinoCommon/html/Overload_Rhino_Geometry_Curve_Contains.htm
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Yep, wow, I got confused by the name. I saw it but when I read “Contains” I assumend it means the point lies on the curve not inside it. Like PointAt. 
Little consistency McNeel, please!
This isn’t:
Curve.Contains()
Thanks @AndersDeleuran