Make ArrayNode.elements() return ListIterator() (#4692)

Author: JooHyukKim

release-notes/VERSION-2.x

@@ -13,6 +13,9 @@ Project: jackson-databind
 #2977: Incompatible `FAIL_ON_MISSING_PRIMITIVE_PROPERTIES` and
   field level `@JsonProperty`
  (reported by @GeorgiPetkov)
+#3120: Return `ListIterator` from `ArrayNode.elements()`
+ (requested by @ludgerb)
+ (fix by Joo-Hyuk K)
 #3241: `constructorDetector` seems to invalidate `defaultSetterInfo`
   for nullability
  (reported by @joca-bt)

src/main/java/com/fasterxml/jackson/databind/node/ArrayNode.java

@@ -246,9 +246,16 @@ public int size() {
     @Override // since 2.10
     public boolean isEmpty() { return _children.isEmpty(); }
 
+    /**
+     * {@inheritDoc}
+     *<p>
+     * NOTE: actual underlying implementation returns {@link java.util.ListIterator}
+     * from {@link java.util.List#listIterator()} that contains elements, since Jackson 2.18
+     * (before was only generic {@link java.util.Iterator}).
+     */
     @Override
     public Iterator<JsonNode> elements() {
-        return _children.iterator();
+        return _children.listIterator();
     }
 
     @Override