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I'm not sure how feasible it is to introduce various zero-cases
into the PDP-10 array code, though HIC may wish to stick that
on his apparently semi-infinite queue.  I would like to see the
NIL array implementation, as well as that for the LISP Machine,
accommodate any number of axes and any axis length, including zero,
subject only to storage limitations and not to random implmentational
restrictions.  I suppose a rank-zero array, if we follow More's ideas
(which seem to be as good as any and better than most), would essentially
be a cell, like those in PLASMA.  Such cells might be a solution
to the flonum-in-special-vallue-cell-without-consing problem?