From fd6a6c1e07bab84db036c7744233ff5762fbc5ac Mon Sep 17 00:00:00 2001
From: Andy Postnikov <apostnikov@gmail.com>
Date: Tue, 23 Jul 2024 02:54:21 +0200
Subject: [PATCH] PHP 8.4 compatibility

RFC https://php.watch/rfcs/deprecate-implicitly-nullable-types
---
 src/Expander.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Expander.php b/src/Expander.php
index 490c9a3..0d984ee 100644
--- a/src/Expander.php
+++ b/src/Expander.php
@@ -103,7 +103,7 @@ protected function doExpandArrayProperties(
         Data   $data,
         array  $array,
         string $parent_keys = '',
-        Data $reference_data = null
+        ?Data $reference_data = null
     ) {
         foreach ($array as $key => $value) {
             // Boundary condition(s).
@@ -201,7 +201,7 @@ function ($matches) use ($data, $reference_data) {
     public function expandStringPropertiesCallback(
         array $matches,
         Data  $data,
-        Data $reference_data = null
+        ?Data $reference_data = null
     ): mixed {
         $property_name = $matches[1];
         $unexpanded_value = $matches[0];