It seems that the function to remove colinear vertices was too aggressive in some cases and was not aggressive enough in other cases. This is because the criteria to evaluate whether a given vertex is colinear did not account for the distance between the neighboring vertices.

Now, a colinear vertex will only be removed if the distance between it and the line drawn between the two neighboring vertices is less than the tolerance.

This will be used in the importers from IDF, OSM, and gbXML, which all represent Faces with a single flat list of vertices.

All of the copy methods really aren't needed since geometry objects are immutable but I can see they might be useful for certain types of advanced editing of underlying properties (that users do at their own peril).

So I'll just leave them as they are and make sure that they work.