In a big library, I had a ‘bug’ because a function which accept only float but not int

def foo(penalty: float):
    if not isinstance(penalty, float):
      raise ValueError(f"`penalty` has to be a float, but is {penalty}")
    # some instruction

I would like to open a PR with the following :

def foo(penalty: float):
    if not isinstance(penalty, (int,float)):
      raise ValueError(f"`penalty` has to be a float or int, but is {penalty}")
    # some instruction

but before this, I ask myself :
are there good reason, in Python to accept float but not int ?