ci = CartesianIndex(2, 3, 4)
CartesianIndex(2, 3, 4)
dump(ci)
CartesianIndex{3} I: Tuple{Int64, Int64, Int64} 1: Int64 2 2: Int64 3 3: Int64 4
Tuple(ci)
(2, 3, 4)
collect(Tuple(ci))
3-element Vector{Int64}: 2 3 4