That's really good! Stone Soup seems to be trying to be quite comprehensive about algorithms, and composable in a way that your library isn't, so it's perhaps

That's really good! Stone Soup seems to be trying to be quite comprehensive about algorithms, and composable in a way that your library isn't, so it's perhaps not ideal for learning. But then it's pure Python, so probably not useful for live use in most production problems (assuming a fairly large number of targets). It's a bit awkward - it ends up bit really meeting either need. I think it would be good for experimenting with a new tracking algorithm though. I think targetting your library firmly at learning puts it at an advantage for that.