GetHashCode from null

class Student
{
    public string Name { get; }
    public string SomeObject { get; }
 
    private readonly int hash;
 
    public Student(string name, object someObject)
    }
        Name = name ?? string.Empty;
        SomeObject = ????????????????????????????????
 
        hash = Name.GetHashCode() ^ SomeObject.GetHashCode();
    }
}

HashCode.Combine(SomeObject ?? "Null")

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override int GetHashCode([DisallowNull] T obj) => obj?.GetHashCode() ?? 0;

else if (type == typeof(string))
{
    // Specialize for string, as EqualityComparer<string>.Default is on the startup path
    result = new GenericEqualityComparer<string>();
}

using System;
 
Console.WriteLine(EqualityComparer<string>.Default.GetHashCode(null));
Console.WriteLine(EqualityComparer<int>.Default.GetHashCode(0));

public Student(string name, object someObject, object someObject2)
{
    hash = (name, someObject.GetType(), someObject, someObject2.GetType(), someObject2).GetHashCode();
}

public Student(string name, object someObject, object someObject2)
{
    hash = HashCode.Combine(name, someObject.GetType(), someObject, someObject2.GetType(), someObject2);
}