EnumTheraotExtensions.HasFlag doesn't handle zero value

[NN---]

[Flags]
public enum X {  A = 1 }

public class Program
{
	public static void Main()
	{
		System.Console.WriteLine(X.A.HasFlag((X)0)); // Expected to be True but False in Theraot
	}
}

Another sample:

using System;

[Flags]
public enum MyFlags
{
 Zero = 0x0,
 A = 0x1,
}

public class Program
{
	public static void Main()
	{
		Console.WriteLine(MyFlags.A.HasFlag(MyFlags.Zero)); // Expected to be True but False in Theraot
	}
}