sdist is missing tox.ini

[mtelka]

The sdist package at PyPI is missing tox.ini. Please add the missing file to sdist to make downstream testing easier. Thank you.

[pajod]

If you want to test from sdist, you additionally want to apply our separately shipped .pylintrc (also currently in git, but not in sdist) or else it'll fail on stylistic checks otherwise suppressed. If we add those two and it fails later on, compare what you are doing to what .github/workflows/tox.yml is doing.