✅ How to disable nullable reference warnings for all consumers.

public static class Operators
{
    public static void ObserveExpressionValue<TSource, TValue>(
        this    TSource                             source
                Expression<Func<TSource, TValue>>   expression);
}

public class MyEntity
    : INotifyPropertyChanged
{
    public required ulong Id { get; init; }
    public required string Name { get; set; }
    public MyEntity? Parent { get; set; }
}

entity.ObserveExpressionValue(static entity => entity.Parent.Parent.Name);