insert_before() signatures cause PyCharm 'unexpected argument' warning

From my code, I call insert_before with two arguments like this:

    insert_before(tag, '\n')

PyCharm Professional 2020.2 gives me an 'Unexpected Argument' warning. I had to add a # noqa to the line to mask the problem. My code works correctly when I run it. I'm using BeautifulSoup 4.9.1.

The signature of insert_before in element.py is:

    def insert_before(self, *args):

The signature in __init__.py is:

    def insert_before(self, successor):

PyCharm must be checking my code against the signature in __init__.py. If I (temporarily) change the signature in __init__.py to match that in element.py, the PyCharm warning goes away.

Can you please review all the signatures in __init__.py that are overridden elsewhere and make them consistent with their implementations?

Thanks!