> I think you can provide a precise specification without losing
> simplicity of explanation. Maybe something like
>
> When step is positive, zero rows are returned if start > stop.
> Conversely, when step is negative, zero rows are returned if
> start < stop. It is an error for step to be zero.
Having something that generates a list of dates would be handy, however
I guess you can do it with the current series generator by adding that
many day intervals to a base date...
Chris
