Available since: 6.2.0
Time complexity: O(N) where N is the number of elements being checked for membership
Returns whether each
member is a member of the set stored at
1 is returned if the value is a member of the set, or
0 if the element is not a member of the set or if
key does not exist.
Array reply: list representing the membership of the given elements, in the same order as they are requested.