Mykel Alvis wrote:
> I support the idea of preventing such an interval from being created.
> 
> If there is a case where such an interval is required, I would like to 
> see the definition of how it is used.
> Am I missing something?  If so, please help me understand what that is.

A zero-length interval is likely to come into existence as the result of 
some other calculation, perhaps (contrived example) by subtracting 
instant a from b and c from d, with the two results being used to create 
an interval.

A zero-length interval is useful in that it has zero length when 
converted to a Duration or Period.

At question is whether a zero-length interval is useful in defining a 
particular instant.

Stephen

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