Lists containing null are considered different

[andrjfrks]

I just found that test1 contains differences.
The other two comparisons are considered equal.

var test1 = AnyDiff.AnyDiff.Diff(new MyComplexClass { Items = new List<string> { null } }, new MyComplexClass { Items = new List<string> { null } });
var test2 = AnyDiff.AnyDiff.Diff(new MyComplexClass { Items = new List<string> { "test" } }, new MyComplexClass { Items = new List<string> { "test" } });
var test3 = AnyDiff.AnyDiff.Diff(new MyComplexClass { Items = new List<string>() }, new MyComplexClass { Items = new List<string>() });