How to improve the usability of nested packages

[Terry Reedy]

nested package == subpackage

> or would you maybe structure the library entirely different?

Based on my limited experience with subpackages* plus reports on this 
list about problems, such as yours, I have concluded that subpackages 
are an attractive nuisance that are generally more trouble than they are 
worth. I suggest you consider sticking with your original flat (no 
subpackage) design. (But maybe someone knows better than me how to make 
subpackages work ;-).

* In my current project, I started with all modules in subpackages but 
have since moved them into the package and deleted the subpackages.

-- 
Terry Jan Reedy