[air] update applier diff on typing

GitOrigin-RevId: e77495caaf613d9b95a35aeb1c697c77fec63252

fleet/util/core/srcCommonMain/fleet/util/Helpers.kt

@@ -31,4 +31,17 @@ fun <T> List<T>.indexOfOrNull(element: T): Int? {
   else {
     index
   }
-}
+}
+
+fun <A, B> Iterable<A>.zipWithNulls(other: Iterable<B>): Iterable<Pair<A?, B?>> {
+  val iter1 = this.iterator()
+  val iter2 = other.iterator()
+
+  val list = ArrayList<Pair<A?, B?>>()
+  while (iter1.hasNext() || iter2.hasNext()) {
+    val v1 = if (iter1.hasNext()) iter1.next() else null
+    val v2 = if (iter2.hasNext()) iter2.next() else null
+    list.add(Pair(v1, v2))
+  }
+  return list
+}