C# Override limitation..why?

Why can't I do this in C#

public class A
{
public A virtual whatever( A a )
{
}
}

public class B : A
{
public B override whatever( B b )
{
}
}

Why does the signature of the override have to match exactly the base
version?

It seems like a perfectly safe thing to do so why can't I do it? In
some situations it saves lots of casting with duplicate methods.

Cliff

.

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