@J.M. I thought you were offering to be the mod that would change it for me.... But I'll just have to wait 6 more days until it can go back to normal..
@Kuba Sounds like a topic: a complete list of objects Normal[] can deal with. The documentation for that function is becoming less extensive with each version.
@J.M. I don't care about docs but the fact that there are more and more "objects" which contain "obvius" information everyone need but they are not accessible with Normal. EmbeddedCode result, Entities etc.
I want to notify everyone that this question is really about computing the Hessian and the derivative of a function (see comment), it's not as complicated as it might look. So if anyone knows how to do that, maybe give it a try. I didn't succeed myself.