Elliptical Arc Question

Hey Folks,

Section F.6.2 of the SVG 1.0 Specification effectively states that an elliptical arc whose endpoints, (x1,y1) and (x2, y2), are identical will not be rendered.  This behavior surprised me since I expected the following cases:

    large-arc-flag=0, sweep-flag=0|1, nothing rendered (per the spec)
    large-arc-flag=1, sweep-flag=0, a complete circle is rendered to the right of (x1,y1)
    large-arc-flag=1, sweep-flag=1, a complete circle is rendered to the left of (x1,y1)
        
I was curious if these cases were considered and, if so, why they were rejected.

Thanks for your time,
Kevin Lindsey