WithArguments method with array or class instance parameters

Hi, I tried to use WithArguments method with array or class instance parameters; but I always get the message that method is called with different parameters even if paramters are actually the same.
Let me clarify myself wtih an example:

public Class1
{...}
public Class2
{...}
public Class3
{
private void PrivateMethod(Class1 c1, Class2[] c2s)
{...}

public void PublicMethod(Class1 c1, Class2[] c2s)
{
PrivateMethod(c1, c2s);
}
}
---------------------------
[TestMethod]
[Isolated]
public void VerifyMethodWasCalled()
{
Class1 c1 = new Class1();
Class2[] c2s = new Class2[2];
c2s[0] = new Class2();
c2s[1] = new Class2();
Class3 fake = Isolate.Fake.Instance<Class3>(Members.CallOriginal);

fake.PublicMethod();

/// In this verification I got warning that PrivateMethod is called with different parameters
Isolate.Verify.NonPublic.WasCalled(fake, "PrivateMethod").WithArguments(c1, c2s);
}

How should I use WithArguments method with array or class instance parameters?

Thanx