Huck Finn: A Bildingsroman?

When I think of the book as a whole, I can see some elements that are similar to the ones we gave as defining characteristics for a Bildingsroman, but I am not sure if that means that it is one. Huck does learn a lot through his journeys, for example he learns a lot about morality and what is honorable and dishonorable, and he learns about believing in a higher power and believing in himself. However, he learns these things simply because he is on the journey, having a classic American adventure, with a runaway slave who takes him under his wing and teaches him things. He is not "coming of age" to the same degree as, say Harry Potter. So when it comes down to it, I don't believe I would classify this novel as a true Bildingsroman.