Add support for PHP 8.1

src/Manager.php

@@ -177,7 +177,7 @@ public function parseIncludes($includes)
         }
 
         foreach ($includes as $include) {
-            list($includeName, $allModifiersStr) = array_pad(explode(':', $include, 2), 2, null);
+            list($includeName, $allModifiersStr) = array_pad(explode(':', $include, 2), 2, '');
             list($allModifiersStr, $subRelations) = array_pad(explode('.', $allModifiersStr, 2), 2, null);
 
             // Trim it down to a cool level of recursion

src/ParamBag.php

@@ -105,6 +105,7 @@ public function __unset($key)
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function offsetExists($key)
     {
         return $this->__isset($key);
@@ -117,6 +118,7 @@ public function offsetExists($key)
      *
      * @return mixed
      */
+    #[\ReturnTypeWillChange]
     public function offsetGet($key)
     {
         return $this->__get($key);
@@ -132,6 +134,7 @@ public function offsetGet($key)
      *
      * @return void
      */
+    #[\ReturnTypeWillChange]
     public function offsetSet($key, $value)
     {
         throw new \LogicException('Modifying parameters is not permitted');
@@ -146,6 +149,7 @@ public function offsetSet($key, $value)
      *
      * @return void
      */
+    #[\ReturnTypeWillChange]
     public function offsetUnset($key)
     {
         throw new \LogicException('Modifying parameters is not permitted');
@@ -156,6 +160,7 @@ public function offsetUnset($key)
      *
      * @return \ArrayIterator
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         return new \ArrayIterator($this->params);

src/Scope.php

@@ -295,7 +295,8 @@ public function toArray()
     /**
      * @return mixed
      */
-    public function jsonSerialize(): mixed
+    #[\ReturnTypeWillChange]
+    public function jsonSerialize()
     {
         return $this->toArray();
     }