IntelliJ-IDEA's Python type checker - incorrect expected type?

Question

In the following code:

from typing import List
def test() -> List[str]:
    ret = ["Hi", "Hi"]
    return ret

I'm receiving the following warning on the function definition line:

Expected type 'Integral", got 'str' instead

I can't see any reason why IntelliJ-IDEA's python module would interpret this simple function as returning an list of Integral rather than str. Is this a type checker bug?

Answer 1

Pycharm only have some preliminary support for type hints.