OPTIONAL SYNOPSIS mixed * intersect_alist (mixed * list1, mixed * list2) DESCRIPTION Does a fast set intersection on alist key vectors (NOT on full alists!). The operator '&' does set intersection on arrays in general. EXAMPLE new_list = intersect_alist(list1, list2); SEE ALSO filter_array(E), assoc(E), insert_alist(E), map_array(E), member_array(E), order_alist(E), sort_array(E), unique_array(E)