[9.x] Replace usage of the optional() helper by the nullsafe operator

.github/workflows/tests.yml

@@ -36,7 +36,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: ['7.3', '7.4', '8.0']
+        php: ['8.0']
         stability: [prefer-lowest, prefer-stable]
         include:
           - php: '8.1'
@@ -89,7 +89,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: ['7.3', '7.4', '8.0']
+        php: ['8.0']
         stability: [prefer-lowest, prefer-stable]
         include:
           - php: '8.1'

.github/workflows/types.yml

@@ -0,0 +1,43 @@
+name: types
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  linux_tests:
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: true
+      matrix:
+        php: ['8.0']
+        include:
+          - php: '8.1'
+            flags: "--ignore-platform-req=php"
+
+    name: PHP ${{ matrix.php }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer:v2
+          coverage: none
+
+      - name: Install dependencies
+        uses: nick-invision/retry@v1
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer update --prefer-stable --prefer-dist --no-interaction --no-progress ${{ matrix.flags }}
+
+      - name: Execute type checking
+        continue-on-error: ${{ matrix.php > 8 }}
+        run: vendor/bin/phpstan