How can I quickly up-cast object[,] into double[,]?

by 
object[,] src = new object[2, 3];

// Initialize src with test doubles.
src[0, 0] = 1.0;
src[0, 1] = 2.0;
src[0, 2] = 3.0;
src[1, 0] = 4.0;
src[1, 1] = 5.0;
src[1, 2] = 6.0;

double[,] dst = new double[src.GetLength(0), src.GetLength(1)];
Array.Copy(src, dst, src.Length);

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