I've got a class which takes a port number (int) and hostname (str):

class X(object):
    def __init__(self, port=6600, host="x.y.com"):
        ...

elsewhere, it can be instantiated using values extracted from a dictionary:

if x is not None:
    self.x = X(port=x['port'], host=x['host'])

That dictionary is itself a parameter declared as as mapping strings to strings or ints:

    # type: Dict[str, Union[str, int]]

mypy complains about the call to X(...) because the values in x can be either strings or ints, but the port and host parameters are declared to be one or the other, not the union of the two.

What's the correct way to work around this issue?