CMC: Given a ragged, but uniform depth, N-dimensional array of strictly positive integers, pad it with zeros to be non-ragged. E.g. [[[2,3],[4,5,6],[5,6]],[[15],[1,4,3,2]],[[2,3],[5,6]]]
→ [[[2,3,0,0],[4,5,6,0],[5,6,0,0]],[[15,0,0,0],[1,4,3,2],[0,0,0,0]],[[2,3,0,0],[5,6,0,0],[0,0,0,0]]]