Will output `y is uint`.

gistfile1.cs

using System;

public class Program {
	private static void Main(string[] args) {
		int[] x = new int[10];
		if (x is uint[]) {
		    Console.WriteLine("x is uint");
		}
		object y = x;
		if (y is uint[]) {
		    Console.WriteLine("y is uint");
		}
	}
}