How to get line start/end without casting it into curve?

The function coerceline is absent in the Rhino.Python Dash Docset Rhino.Python Dash Docset , that seems to be quite outdated.
The link above I got from the Rhinoceros doc page https://developer.rhino3d.com/guides/rhinopython/ . Will the docset be updated in nearest time?
Regards, D.