DirtyUtils.cs

static class DirtyUtils {
    static bool Same<T1, T2>(ref int hash, in T1 v1, in T2 v2) {
        var prev = hash;
        hash = v1.GetHashCode();
        hash = (hash * 397) ^ v2.GetHashCode();
        return hash == prev;
    }
    
    public static int HashCode<T1, T2>(in T1 v1, in T2 v2) {
        var hash = v1.GetHashCode();
        hash = (hash * 397) ^ v2.GetHashCode();
        return hash;
    }

    public static int HashCode<T1, T2, T3>(in T1 v1, in T2 v2, in T3 v3) {
        var hash = v1.GetHashCode();
        hash = (hash * 397) ^ v2.GetHashCode();
        hash = (hash * 397) ^ v3.GetHashCode();
        return hash;
    }
    
    public static int HashCode<T1, T2, T3, T4>(in T1 v1, in T2 v2, in T3 v3, in T4 v4)
    {
        var hash = v1.GetHashCode();
        hash = (hash * 397) ^ v2.GetHashCode();
        hash = (hash * 397) ^ v3.GetHashCode();
        hash = (hash * 397) ^ v4.GetHashCode();
        return hash;
    }
    
}