o When created displaced arrays, MAKE-ARRAY (unlike ADJUST-ARRAY)
didn't check whether the specified element-type was a subtype of the array-element-type of the displaced-to array. o One case in ADJUST-ARRAY didn't check for an array-header before calling %array-displaced-p on an array, so that sometimes an array element was accessed and checked instead. Fixed this, and prevented ADJUST-ARRAY from shrinking non-adjustable arrays in-place, since this can violate naive user expectations for little gain.
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