duckinator/bork

AI Summary: The Python build and release tool 'bork' failed to upload files to PyPI during a 10.x release due to a `TypeError: a bytes-like object is required, not 'NoneType'` in the `urllib3` library. The task is to debug the `bork` code, specifically the `upload` function within the `pypi.py` module, to identify why `encode_multipart_formdata` is receiving a `NoneType` instead of a bytes-like object. This likely involves inspecting the file handling and data encoding within the `upload` process.