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Nice, thanks!

Are you planning to only use this config option along with preload_modules? I suppose other users would want to use it directly, without having to specify other modules to preload? Then we should also add find_stubs_package=final_config["find_stubs_package"] to the next line (285 here).

Could you also add an entry in the documentation? In docs/usage/configuration/general.md. No need for previews here, just an explanation of what this does, with file layouts (you can use tree fences).

I can also take it from here if you don't have the capacity 🙂