Desired Behavior

With include_subdirs qualified, dune should allow configuring the name of the namespaced module

Example

A proposal:

(include_subdirs 
  (mode qualified)
  ((src foo) (src/invalid-[module]-name invalid_module_name)))

Motivation here being next.js folder names https://beta.nextjs.org/docs/routing/defining-routes and natural-feeling interop with melange.