Lookahead.patch

--- Lookahead.php	2017-01-10 11:34:47.000000000 +0100
+++ Lookahead.php	2021-10-30 16:35:30.000000000 +0200
@@ -93,7 +93,7 @@
      *
      * @return  \Iterator
      */
-    public function getInnerIterator()
+    public function getInnerIterator(): ?\Iterator
     {
         return $this->_iterator;
     }
@@ -103,6 +103,7 @@
      *
      * @return  mixed
      */
+	#[\ReturnTypeWillChange]
     public function current()
     {
         return $this->_current;
@@ -113,6 +114,7 @@
      *
      * @return  mixed
      */
+	#[\ReturnTypeWillChange]
     public function key()
     {
         return $this->_key;
@@ -123,6 +125,7 @@
      *
      * @return  void
      */
+	#[\ReturnTypeWillChange]
     public function next()
     {
         $innerIterator = $this->getInnerIterator();
@@ -143,6 +146,7 @@
      *
      * @return  void
      */
+	#[\ReturnTypeWillChange]
     public function rewind()
     {
         $out = $this->getInnerIterator()->rewind();
@@ -156,7 +160,7 @@
      *
      * @return  bool
      */
-    public function valid()
+    public function valid(): bool
     {
         return $this->_valid;
     }