This will also need to be added to the package data files.

This will also need to be added to the package data files.

Why? My understanding is that either package_data or MANIFEST.in should work, but we do not need both.

The https://setuptools.pypa.io/en/latest/userguide/datafiles.html#package-data says:

Note that the data files specified using the package_data option neither require to be included within a MANIFEST.in file, nor require to be added by a revision control system plugin.

Fair enough, I've never really looked at MANIFEST.in but bashrc.sh is also there too.
To be clear, I am happy with this as is but figured I'd ask just in case.