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How about...

MacLisp still lacks a way to get array dimension information without
consing.  Why not adopt the LispMachine function array-dimension-n?

(array-dimension-n <dimension you want the size of> <array>)

(Look at the manual first, the damned thing is 1 based since it
returns the leader length for dimension 0, and it returns nil for
non-existant dimensions.)