[Python] type hinting signature of handler for signal.signal

I can't get the type hinting for the handler of signal.signal(signum, handler) right, and I don't know what to import

class someclass:
def handler(self, signum, frame):
pass

def __init__() -> None:
signal.signal(signal.SIGINT, self.handler):


I'm somehow surprised that it seems that signum seems to be an int...

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