@pganssle Aha, I'm using Hatchling which uses SPDX identifiers:
https://hatch.pypa.io/latest/config/metadata/#license
Which points to the draft #PEP639 – "Improving License Clarity with Better Package Metadata":
https://peps.python.org/pep-0639/
Hopefully it'll be submitted soon. 🤞
@hugovk Either way it's a huge footgun. The thing everyone is going to think to do causes this problem.