Add “#[\ReturnTypeWillChange]” comments to all InteratorAggregate, Countable and PDOStatement interface classes to stop PHP 8.1 notices per https://php.watch/versions/8.1/internal-method-return-types and processwire/processwire-issues#1467 ... someday when all PHP 5.x support can be dropped these will be converted to PHP 7.1+ return types

wire/core/FilenameArray.php

@@ -81,6 +81,7 @@ class FilenameArray implements \IteratorAggregate, \Countable {
 	 * @return \ArrayObject
 	 * 
 	 */
+	#[\ReturnTypeWillChange] 
 	public function getIterator() {
 		return new \ArrayObject($this->data); 
 	}
@@ -138,6 +139,7 @@ class FilenameArray implements \IteratorAggregate, \Countable {
 	 * @return int
 	 * 
 	 */
+	#[\ReturnTypeWillChange] 
 	public function count() {
 		return count($this->data);
 	}