Fix 8.4 deprecations

fix null pointer when merging objects with no required params
Require 8.1

Author: nickdnk

.github/workflows/test.yml

@@ -2,10 +2,10 @@ name: Test
 on: [ push ]
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
-        php: [ '8.0', '8.1' ]
+        php: [ '8.1', '8.2', '8.3', '8.4' ]
     steps:
       - uses: actions/checkout@v2
       - run: mkdir -p build/logs

composer.json

@@ -13,7 +13,7 @@
     }
   ],
   "require": {
-    "php": "^8.0",
+    "php": "^8.1",
     "ext-json": "*"
   },
   "autoload": {