> I _think_ it's because there a bdist in PyPI for one, and not the other, so `pip` is using different "backends" that normalize the names into `METADATA` diffe

> I _think_ it's because there a bdist in PyPI for one, and not the other, so `pip` is using different "backends" that normalize the names into `METADATA` differently... ugh. That isn't why: it's because `cast-from-env`'s sdist is from March 2023, while PEP 625 (which strongly stipulates package name normalization) was adopted in setuptools a year later[1]. But to take a step back: why does the difference in `pip freeze` affect you? It shouldn't matter to `pip`, since PyPI will happily serve from both the normalized and unnormalized names. [1]: https://github.com/pypa/setuptools/issues/3593 https://github.com/pypa/setuptools/issues/3593