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A general description is here.
Arithmetic, logic (‘&’, ‘|’) and comparison (aka ‘relational’, e.g., ‘<’, ‘==’) operations with arrays now behave consistently. Arithmetic between length-1 arrays and longer non-arrays had silently dropped the array attributes and recycled. This now gives a warning and will signal an error in the future, as it has always for logic and comparison operations in these cases (e.g., compare ‘matrix(1,1) + 2:3’ and ‘matrix(1,1) < 2:3’).