var array = new int[2][][]
{
new int[3][]
{
new int[2] { 0, 1 },
new int[3] { 2, 3, 4 },
Array.Empty<int>(),
},
new int[1][]
{
new int[4] { 0, 1, 2, 3 },
}
};
UniJaggedD3<int> jagged = new(array);
Assert(jagged.Length3(0, 2) == 0);
public readonly Func<int, int, int> Length3