StructuralComparer.cs

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using System.Collections.Generic;
 
namespace System.Collections;
 
internal sealed class StructuralComparer : IComparer
{
    public int Compare(object x, object y)
    {
        if (x == null)
        {
            if (y != null)
            {
                return -1;
            }
            return 0;
        }
        if (y == null)
        {
            return 1;
        }
        if (x is IStructuralComparable structuralComparable)
        {
            return structuralComparable.CompareTo(y, this);
        }
        return Comparer<object>.Default.Compare(x, y);
    }
}