e.g.

# map.py
def func(a: int) -> float:
    return float(a)

map(func, ['str'])

$ pytype map.py
Computing dependencies
Analyzing 1 sources with 0 local dependencies
ninja: Entering directory `/[redacted]/.pytype'
ninja: no work to do.
Success: no errors found

while

$ mypy map.py
map.py:5: error: Argument 1 to "map" has incompatible type "Ca

Sometimes user might not realize he's typing incorrectly and continue typing multiple words. In such a scenario, one may prefer erasing the entire word with the help of the ctrl + backspace combo.

For example -
Current string is "quqick brown"

Pressing the key combo should erase

Just fix tests to use Factory instead of old style

We get the return annotation for free, so we should allow users to do something with it.

Currently, we support only Optional[primitive], but we should also support things like:
Optional[List],
Optional[List[int]]
Optional[Set]
Optional[Tuple]
etc.