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Liam M. Healy authored
Addition and subtraction on pq grid makes a result with consistent scalar-dimension and dimel slots, thanks to a second return value from dimel-or-not and therefore equal-dimension. Also, a more refined check on make-pq-object if #+debug holds, so that trying to make a pq with a scalar dimel and scalar-dimension nil will give an (incorrectly labeled) error.
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