I obviously can't share it here, but my primary codebase at my job needs a few dozen changes every time we change mypy versions. There's a few places of false positives where I've had to comment `# shut up, mypy` and a `type: ignore`. Usually when I'm being clever with the subprocess module.
I wonder if that's a mypy issue or more that the typeshed types are bugged, since type shed versions also get shipped (used to?) with new type checker versions.
