ruff: F821 triggers when using non-ASCII characters

from time import time_ns

def time_µs() -> int:
	return time_ns() // 1000

def main() -> None:
	print(time_µs())

if __name__ == "__main__":
	main()

test.py:7:9: F821 Undefined name `time_μs`

(it’s obviously fine with a name like time_us)