PHP 8.4 compatibility (#50)

* tweak: explicit nullable type for PHP 8.4 compatibility

* build: php versions & ci runners

* build: ci coverage for all php versions

.github/workflows/ci.yml

@@ -7,16 +7,16 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: [ 8.0, 8.1, 8.2 ]
+        php: [ 8.1, 8.2, 8.3, 8.4 ]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Cache Composer dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /tmp/composer-cache
-          key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}
+          key: ${{ runner.os }}-${{ matrix.php }}-${{ hashFiles('**/composer.lock') }}
 
       - name: Composer install
         uses: php-actions/composer@v6
@@ -27,32 +27,32 @@ jobs:
         run: mkdir /tmp/github-actions/ && tar -cvf /tmp/github-actions/build.tar ./
 
       - name: Upload build archive for test runners
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: build-artifact
+          name: build-artifact-${{ matrix.php }}
           path: /tmp/github-actions
 
   phpunit:
     runs-on: ubuntu-latest
     needs: [ composer ]
     strategy:
       matrix:
-        php: [ 8.0, 8.1, 8.2 ]
+        php: [ 8.1, 8.2, 8.3, 8.4 ]
 
     outputs:
       coverage: ${{ steps.store-coverage.outputs.coverage_text }}
 
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: build-artifact
+          name: build-artifact-${{ matrix.php }}
           path: /tmp/github-actions
 
       - name: Extract build archive
         run: tar -xvf /tmp/github-actions/build.tar ./
 
       - name: PHP Unit tests
-        uses: php-actions/phpunit@v3
+        uses: php-actions/phpunit@v4
         env:
           XDEBUG_MODE: cover
         with:
@@ -62,40 +62,43 @@ jobs:
           coverage_clover: _coverage/clover.xml
 
       - name: Store coverage data
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: code-coverage
+          name: code-coverage-${{ matrix.php }}-${{ github.run_number }}
           path: _coverage
 
   coverage:
     runs-on: ubuntu-latest
     needs: [ phpunit ]
+    strategy:
+      matrix:
+        php: [ 8.1, 8.2, 8.3, 8.4 ]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: code-coverage
+          name: code-coverage-${{ matrix.php }}-${{ github.run_number }}
           path: _coverage
 
       - name: Output coverage
         run: cat "_coverage/coverage.txt"
 
       - name: Upload to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v5
 
   phpstan:
     runs-on: ubuntu-latest
     needs: [ composer ]
     strategy:
       matrix:
-        php: [ 8.0, 8.1, 8.2 ]
+        php: [ 8.1, 8.2, 8.3, 8.4 ]
 
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: build-artifact
+          name: build-artifact-${{ matrix.php }}
           path: /tmp/github-actions
 
       - name: Extract build archive
@@ -112,12 +115,12 @@ jobs:
     needs: [ composer ]
     strategy:
       matrix:
-        php: [ 8.0, 8.1, 8.2 ]
+        php: [ 8.1, 8.2, 8.3, 8.4 ]
 
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: build-artifact
+          name: build-artifact-${{ matrix.php }}
           path: /tmp/github-actions
 
       - name: Extract build archive
@@ -136,12 +139,12 @@ jobs:
     needs: [ composer ]
     strategy:
       matrix:
-        php: [ 8.0, 8.1, 8.2 ]
+        php: [ 8.1, 8.2, 8.3, 8.4 ]
 
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: build-artifact
+          name: build-artifact-${{ matrix.php }}
           path: /tmp/github-actions
 
       - name: Extract build archive
@@ -162,7 +165,7 @@ jobs:
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
-          gh api "/repos/${{ github.repository }}/actions/artifacts?name=build-artifact" | jq ".artifacts[] | select(.name == \"build-artifact\") | .id" > artifact-id-list.txt
+          gh api "/repos/${{ github.repository }}/actions/artifacts?name=build-artifact" | jq ".artifacts[] | select(.name | startswith(\"build-artifact\")) | .id" > artifact-id-list.txt
           while read id
           do
             echo -n "Deleting artifact ID $id ... "

composer.json

@@ -4,7 +4,7 @@
 	"type": "library",
 
 	"require": {
-		"php": ">=8.0",
+		"php": ">=8.1",
 		"ext-json": "*",
 		"phpgt/typesafegetter": "^1.3"
 	},