I think the bikeshed should be painted green, for what its worth

As mentioned in the proposal discussion, we favored option A and Boundary provides a more complete implementation - so I would advise to use that. We have no plans to introduce defmodulep in core. You can see the proposal discussion for my rationale.

I haven’t read through all the threads on this topic but has the community thought about going the route Rust took, where every function is private by default? To make something public you have to declare it public like:

pub def this_is_my_public_facing_api(), do: # do something great

This way we don’t have to worry about private modules or whatever.