Just checking: what does the rest of longobject do? Sorry I cant check myself as Im on mobile

There are many (digit) casts if something is assigned to a digit, but is a bigger data type.

Here that cast is missing, hence, MSVC fires the warning. Which is of no concern, since a few lines above

    if(!is_medium_int(x)) {
        return PyStackRef_NULL;
    }

ensures that the contents of stwodigits x is small enough to be cast into a digit without loss.

But since here a signed conversion takes place, too, I'd appreciate a second pair of eyes @markshannon ?