Fix naming of set-theory utils to match convention (#7343)

src/utils/iterables.ts

@@ -14,16 +14,16 @@
  * limitations under the License.
  */
 
-import { arrayDiff, arrayMerge, arrayUnion } from "./arrays";
-
-export function iterableMerge<T>(a: Iterable<T>, b: Iterable<T>): Iterable<T> {
-    return arrayMerge(Array.from(a), Array.from(b));
-}
+import { arrayDiff, arrayUnion, arrayIntersection } from "./arrays";
 
 export function iterableUnion<T>(a: Iterable<T>, b: Iterable<T>): Iterable<T> {
     return arrayUnion(Array.from(a), Array.from(b));
 }
 
+export function iterableIntersection<T>(a: Iterable<T>, b: Iterable<T>): Iterable<T> {
+    return arrayIntersection(Array.from(a), Array.from(b));
+}
+
 export function iterableDiff<T>(a: Iterable<T>, b: Iterable<T>): { added: Iterable<T>, removed: Iterable<T> } {
     return arrayDiff(Array.from(a), Array.from(b));
 }