Is there a more uncommon name we could use for this? I'm thinking a lot of people might write a numba_extensions module in their project.
Was the top level package going to be a namespace package? I've no experience with them, but I have avoided using them in the past because I was concerned it would be easy to cause confusing issues with them if someone makes an error in one of the sub-packages (this may be an unfounded concern, I just don't know).
A couple of thoughts:
numba_extensions
module in their project.