name = "mypkg"
        version = "42"

        [tool.setuptools]
        packages = ["mypkg", "mypkg.sub1", "mypkg.sub2", "mypkg.sub2.nested"]

        [tool.setuptools.package-dir]
        "" = "src"
        "mypkg.sub2" = "src/mypkg/_sub2"
        "mypkg.sub2.nested" = "other"
        r4