Alternative names to defmodulep (split thread)

I know is archived, sorry to have mislead you about my intentions in my question. I don’t want to use it directly, but instead my question intention was when could we expect it in Elixir itself.

I though the repo for defmodulep was a playground for this proposal by Jose, but I noticed now that unfortunately it seems the preference goes to option A.

Any idea when Option A will be available in Elixir core?

I am not planning in developing a new library at all, and I already know about Boundary, but I was really expecting to have private modules in Elixir. I would prefer this to be built-in in the language then enforced by a dependency.