Take Two Classes:

public class ClassA
{
    public List<int> SomeList { get; set; }
}

public class ClassB : ClassA
{
    new public IEnumerable<int> SomeList { get; set; }
}

If ClassB is serialized an exception is thrown:

The JSON property name for 'ClassB.SomeList' collides with another property.

This seems like unwanted behavior.