from typing import Any
from typing import List


def is_array(thing: Any) -> bool:
    """
    A function that returns whether the given value is an array.  This is in terms of
    a data structure and equates to checking that the value is a list.

    :param thing: the value to check.
    :return: ``True`` if the value is a list.
    """
    return isinstance(thing, List)