thanks for the library! we love it. found another issue tho, consider the class:

class Foo(TypedDict):
    bar: NotRequired[Union[bool, None]]

ruff lint throws on the property and will autofix to use a pipe operator when "UP" ruleset is selected:

    bar: NotRequired[bool | None]

this syntax is enabled only in python 3.10+ and breaks applications on an earlier version. in my case, I have pyproject.toml with the following subsnippet:

[tool.ruff]
target-version = 'py37'

two interesting asides:

1. I am running ruff cli inside a docker container that has python 3.10 installed. hopefully ruff is smart enough to use the pyproject.toml for reference and does try to detect via the current process version
2. i couldn't easily see documentation on how to dump or log the ruff config from inside the process, so I simply have to trust that pyproject.toml is respected and I can't really troubleshoot. I'll file a feature request to enhance ruff -V or some other mechanism