2018.2 type hint error at debug runtime?

I have a function which when I look at Quick Documentation gives me the suggested typehint of OrderedDict[str, str], yet when I manually add that typehint I run into an error at debug runtime.

def lastword(s:str) -> str:
    a = s.strip('?').split()[-1].split('/')[-1]
    return a

def createOrderdDict(q1:str, q2:str, q3:str, q4:str, q5:str):
    answers = OrderedDict([
        (q1, lastword(q1)),
        (q2, lastword(q2)),
        (q3, lastword(q3)),
        (q4, lastword(q4)),
        (q5, lastword(q5)),
        ])
    return answers

def createOrderdDict(q1:str, q2:str, q3:str, q4:str, q5:str) -> OrderedDict[str, str]:
    answers = OrderedDict([
        (q1, lastword(q1)),
        (q2, lastword(q2)),
        (q3, lastword(q3)),
        (q4, lastword(q4)),
        (q5, lastword(q5)),
        ])
    return answers

Any idea what is going on here?