[J3] Default values for optional arguments

[Van Snyder]

On Wed, 2021-01-20 at 10:55 -0700, William Clodius via J3 wrote:
> 	1. Having a default value means that the argument ia always
> present with a value so the present(argument) test is never
> appropriate. The easiest way to express this in standardess I believe
> is to forbid an argument from having both the optional and default
> attribute at the same time and requiring that actual arguments to the
> present function must have the optional attribute.

I don't see any conflict between OPTIONAL and having a default value.
It can still be useful to know whether an optional argument was
present, even if it has an optional value. That's definitely not a
problem as things are now, where one must explicitly create a local
variable in lieu of the dummy argument. I don't see why it's a problem
if the processor does it automagically.

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