Interesting discussion, thanks for the link! I side with pf_moore there; when I think of distributing a library I think of shipping only the library code itself and none of the supporting files, although I can understand the argument to include things like tests/ and docs/.

That said, if you haven't already tailored your project for hatch, configuring only-include is more work than switching to a build backend that just bundles source modules by default. With the right config hatch can do what you like, and I can understand existing users sticking with it, but for newbies I think it's really risky to suggest a build backend that grabs everything it finds in the working directory and packages it up for PyPI. It's just surprising and dangerous default behavior imo.