Parse specified names for IntEnum; return default if not found.

def parse_names(cls, names: List[str]) -> T:
        """Parse specified names for IntEnum; return default if not found."""
        value = 0
        iterable = cls  # type: Iterable
        for name in names:
            name = name.lower()
            flag = next((item for item in iterable if name == item.name.lower()), None)
            if not flag:
                raise ValueError("{} is not a member of {}".format(
                    name, cls.__name__))
            value = value | int(flag)
        return cls(value)