[Python] --help gets stuck in command line for fire module

I have this simple code for python fire and for some reason I get stuck anytime I use the --help flag.

import fire

def double(number):
"""A simple function."""
return 2 * number

if __name__ == '__main__':
fire.Fire(double)


when I run

$ pipenv run python3 ./scripts/test.py --help


I get the help but also CLI hangs and I have to ctrl + C to exit.

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