Bruce Momjian <bruce(at)momjian(dot)us> writes:
> What is odd however, is that we allow _explicit_ creation of zero-radius
> circles:
> test=> SELECT circle '<(1,1),0>';
> circle
> -----------
> <(1,1),0>
> (1 row)
> so why do we prevent the conversion of single-point polygons to circles
> with zero radius? I don't know.
Maybe we should rethink that. What you've done here seems like a kluge.
regards, tom lane