diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1de81ec..cdf81c1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,19 +1,28 @@
 name: CI
 
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+  actions: read
 
 jobs:
   composer:
+    permissions:
+      contents: read
+      actions: write
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: [ 8.3, 8.4 ]
+        php: [ 8.3, 8.4, 8.5 ]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Cache Composer dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: /tmp/composer-cache
           key: ${{ runner.os }}-${{ matrix.php }}-${{ hashFiles('**/composer.lock') }}
@@ -22,9 +31,10 @@ jobs:
         uses: php-actions/composer@v6
         with:
           php_version: ${{ matrix.php }}
+          php_extensions: pcntl
 
       - name: Archive build
-        run: mkdir /tmp/github-actions/ && tar -cvf /tmp/github-actions/build.tar ./
+        run: mkdir /tmp/github-actions/ && tar --exclude=".git" -cvf /tmp/github-actions/build.tar ./
 
       - name: Upload build archive for test runners
         uses: actions/upload-artifact@v4
@@ -37,7 +47,7 @@ jobs:
     needs: [ composer ]
     strategy:
       matrix:
-        php: [ 8.3, 8.4 ]
+        php: [ 8.3, 8.4, 8.5 ]
 
     outputs:
       coverage: ${{ steps.store-coverage.outputs.coverage_text }}
@@ -60,12 +70,11 @@ jobs:
           php_extensions: xdebug
           coverage_text: _coverage/coverage.txt
           coverage_clover: _coverage/clover.xml
-          bootstrap: vendor/autoload.php
 
       - name: Store coverage data
         uses: actions/upload-artifact@v4
         with:
-          name: code-coverage-${{ matrix.php }}
+          name: code-coverage-${{ matrix.php }}-${{ github.run_number }}
           path: _coverage
 
   coverage:
@@ -73,28 +82,30 @@ jobs:
     needs: [ phpunit ]
     strategy:
       matrix:
-        php: [ 8.3, 8.4 ]
+        php: [ 8.3, 8.4, 8.5 ]
 
     steps:
       - uses: actions/checkout@v4
 
       - uses: actions/download-artifact@v4
         with:
-          name: code-coverage-${{ matrix.php }}
+          name: code-coverage-${{ 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
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   phpstan:
     runs-on: ubuntu-latest
     needs: [ composer ]
     strategy:
       matrix:
-        php: [ 8.3, 8.4 ]
+        php: [ 8.3, 8.4, 8.5 ]
 
     steps:
       - uses: actions/download-artifact@v4
@@ -110,6 +121,55 @@ jobs:
         with:
           php_version: ${{ matrix.php }}
           path: src/
+          level: 6
+          memory_limit: 256M
+
+  phpmd:
+    runs-on: ubuntu-latest
+    needs: [ composer ]
+    strategy:
+      matrix:
+        php: [ 8.3, 8.4, 8.5 ]
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: build-artifact-${{ matrix.php }}
+          path: /tmp/github-actions
+
+      - name: Extract build archive
+        run: tar -xvf /tmp/github-actions/build.tar ./
+
+      - name: PHP Mess Detector
+        uses: php-actions/phpmd@v1
+        with:
+          php_version: ${{ matrix.php }}
+          path: src/
+          output: text
+          ruleset: phpmd.xml
+
+  phpcs:
+    runs-on: ubuntu-latest
+    needs: [ composer ]
+    strategy:
+      matrix:
+        php: [ 8.3, 8.4, 8.5 ]
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: build-artifact-${{ matrix.php }}
+          path: /tmp/github-actions
+
+      - name: Extract build archive
+        run: tar -xvf /tmp/github-actions/build.tar ./
+
+      - name: PHP Code Sniffer
+        uses: php-actions/phpcs@v1
+        with:
+          php_version: ${{ matrix.php }}
+          path: src/
+          standard: phpcs.xml
 
   remove_old_artifacts:
     runs-on: ubuntu-latest
diff --git a/composer.json b/composer.json
index b2ce862..fbdbba7 100644
--- a/composer.json
+++ b/composer.json
@@ -4,13 +4,15 @@
 	"type": "library",
 
 	"require": {
-		"php": ">=8.2",
+		"php": ">=8.3",
 		"phpgt/typesafegetter": "^v1.2",
 		"magicalex/write-ini-file": "v1.2.4"
 	},
 	"require-dev": {
 		"phpstan/phpstan": "^2.1",
-		"phpunit/phpunit": "^12.4"
+		"phpunit/phpunit": "^12.4",
+		"squizlabs/php_codesniffer": "^4.0",
+		"phpmd/phpmd": "^2.15"
 	},
 
 	"license": "MIT",
diff --git a/composer.lock b/composer.lock
index 788ca66..efe49a4 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0908843383dc49b1fd799830ac81f6af",
+    "content-hash": "61ba22e1b2bff7d54287b5c50540418c",
     "packages": [
         {
             "name": "magicalex/write-ini-file",
@@ -59,16 +59,16 @@
         },
         {
             "name": "phpgt/typesafegetter",
-            "version": "v1.3.2",
+            "version": "v1.3.3",
             "source": {
                 "type": "git",
-                "url": "https://github.com/PhpGt/TypeSafeGetter.git",
-                "reference": "f760c05a37b1cc188dcbf800c5fdfab8a926b4b0"
+                "url": "https://github.com/phpgt/TypeSafeGetter.git",
+                "reference": "a0d339103828791989cbb81f760d252f3c2f8b8c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PhpGt/TypeSafeGetter/zipball/f760c05a37b1cc188dcbf800c5fdfab8a926b4b0",
-                "reference": "f760c05a37b1cc188dcbf800c5fdfab8a926b4b0",
+                "url": "https://api.github.com/repos/phpgt/TypeSafeGetter/zipball/a0d339103828791989cbb81f760d252f3c2f8b8c",
+                "reference": "a0d339103828791989cbb81f760d252f3c2f8b8c",
                 "shasum": ""
             },
             "require": {
@@ -98,8 +98,8 @@
             ],
             "description": "An interface for objects that expose type-safe getter methods.",
             "support": {
-                "issues": "https://github.com/PhpGt/TypeSafeGetter/issues",
-                "source": "https://github.com/PhpGt/TypeSafeGetter/tree/v1.3.2"
+                "issues": "https://github.com/phpgt/TypeSafeGetter/issues",
+                "source": "https://github.com/phpgt/TypeSafeGetter/tree/v1.3.3"
             },
             "funding": [
                 {
@@ -107,10 +107,155 @@
                     "type": "github"
                 }
             ],
-            "time": "2023-04-28T14:42:27+00:00"
+            "time": "2026-03-10T22:28:01+00:00"
         }
     ],
     "packages-dev": [
+        {
+            "name": "composer/pcre",
+            "version": "3.3.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/pcre.git",
+                "reference": "b2bed4734f0cc156ee1fe9c0da2550420d99a21e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/pcre/zipball/b2bed4734f0cc156ee1fe9c0da2550420d99a21e",
+                "reference": "b2bed4734f0cc156ee1fe9c0da2550420d99a21e",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4 || ^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan": "<1.11.10"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.12 || ^2",
+                "phpstan/phpstan-strict-rules": "^1 || ^2",
+                "phpunit/phpunit": "^8 || ^9"
+            },
+            "type": "library",
+            "extra": {
+                "phpstan": {
+                    "includes": [
+                        "extension.neon"
+                    ]
+                },
+                "branch-alias": {
+                    "dev-main": "3.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\Pcre\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "PCRE wrapping library that offers type-safe preg_* replacements.",
+            "keywords": [
+                "PCRE",
+                "preg",
+                "regex",
+                "regular expression"
+            ],
+            "support": {
+                "issues": "https://github.com/composer/pcre/issues",
+                "source": "https://github.com/composer/pcre/tree/3.3.2"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-11-12T16:29:46+00:00"
+        },
+        {
+            "name": "composer/xdebug-handler",
+            "version": "3.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/xdebug-handler.git",
+                "reference": "6c1925561632e83d60a44492e0b344cf48ab85ef"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/6c1925561632e83d60a44492e0b344cf48ab85ef",
+                "reference": "6c1925561632e83d60a44492e0b344cf48ab85ef",
+                "shasum": ""
+            },
+            "require": {
+                "composer/pcre": "^1 || ^2 || ^3",
+                "php": "^7.2.5 || ^8.0",
+                "psr/log": "^1 || ^2 || ^3"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.0",
+                "phpstan/phpstan-strict-rules": "^1.1",
+                "phpunit/phpunit": "^8.5 || ^9.6 || ^10.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Composer\\XdebugHandler\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "John Stevenson",
+                    "email": "john-stevenson@blueyonder.co.uk"
+                }
+            ],
+            "description": "Restarts a process without Xdebug.",
+            "keywords": [
+                "Xdebug",
+                "performance"
+            ],
+            "support": {
+                "irc": "ircs://irc.libera.chat:6697/composer",
+                "issues": "https://github.com/composer/xdebug-handler/issues",
+                "source": "https://github.com/composer/xdebug-handler/tree/3.0.5"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-05-06T16:37:16+00:00"
+        },
         {
             "name": "myclabs/deep-copy",
             "version": "1.13.4",
@@ -173,16 +318,16 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v5.6.1",
+            "version": "v5.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "f103601b29efebd7ff4a1ca7b3eeea9e3336a2a2"
+                "reference": "dca41cd15c2ac9d055ad70dbfd011130757d1f82"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/f103601b29efebd7ff4a1ca7b3eeea9e3336a2a2",
-                "reference": "f103601b29efebd7ff4a1ca7b3eeea9e3336a2a2",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/dca41cd15c2ac9d055ad70dbfd011130757d1f82",
+                "reference": "dca41cd15c2ac9d055ad70dbfd011130757d1f82",
                 "shasum": ""
             },
             "require": {
@@ -225,9 +370,72 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v5.6.1"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.7.0"
+            },
+            "time": "2025-12-06T11:56:16+00:00"
+        },
+        {
+            "name": "pdepend/pdepend",
+            "version": "2.16.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/pdepend/pdepend.git",
+                "reference": "f942b208dc2a0868454d01b29f0c75bbcfc6ed58"
             },
-            "time": "2025-08-13T20:13:15+00:00"
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/pdepend/pdepend/zipball/f942b208dc2a0868454d01b29f0c75bbcfc6ed58",
+                "reference": "f942b208dc2a0868454d01b29f0c75bbcfc6ed58",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.7",
+                "symfony/config": "^2.3.0|^3|^4|^5|^6.0|^7.0",
+                "symfony/dependency-injection": "^2.3.0|^3|^4|^5|^6.0|^7.0",
+                "symfony/filesystem": "^2.3.0|^3|^4|^5|^6.0|^7.0",
+                "symfony/polyfill-mbstring": "^1.19"
+            },
+            "require-dev": {
+                "easy-doc/easy-doc": "0.0.0|^1.2.3",
+                "gregwar/rst": "^1.0",
+                "squizlabs/php_codesniffer": "^2.0.0"
+            },
+            "bin": [
+                "src/bin/pdepend"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PDepend\\": "src/main/php/PDepend"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "description": "Official version of pdepend to be handled with Composer",
+            "keywords": [
+                "PHP Depend",
+                "PHP_Depend",
+                "dev",
+                "pdepend"
+            ],
+            "support": {
+                "issues": "https://github.com/pdepend/pdepend/issues",
+                "source": "https://github.com/pdepend/pdepend/tree/2.16.2"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/pdepend/pdepend",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-12-17T18:09:59+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -347,13 +555,96 @@
             },
             "time": "2022-02-21T01:04:05+00:00"
         },
+        {
+            "name": "phpmd/phpmd",
+            "version": "2.15.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpmd/phpmd.git",
+                "reference": "74a1f56e33afad4128b886e334093e98e1b5e7c0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpmd/phpmd/zipball/74a1f56e33afad4128b886e334093e98e1b5e7c0",
+                "reference": "74a1f56e33afad4128b886e334093e98e1b5e7c0",
+                "shasum": ""
+            },
+            "require": {
+                "composer/xdebug-handler": "^1.0 || ^2.0 || ^3.0",
+                "ext-xml": "*",
+                "pdepend/pdepend": "^2.16.1",
+                "php": ">=5.3.9"
+            },
+            "require-dev": {
+                "easy-doc/easy-doc": "0.0.0 || ^1.3.2",
+                "ext-json": "*",
+                "ext-simplexml": "*",
+                "gregwar/rst": "^1.0",
+                "mikey179/vfsstream": "^1.6.8",
+                "squizlabs/php_codesniffer": "^2.9.2 || ^3.7.2"
+            },
+            "bin": [
+                "src/bin/phpmd"
+            ],
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "PHPMD\\": "src/main/php"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Manuel Pichler",
+                    "email": "github@manuel-pichler.de",
+                    "homepage": "https://github.com/manuelpichler",
+                    "role": "Project Founder"
+                },
+                {
+                    "name": "Marc Würth",
+                    "email": "ravage@bluewin.ch",
+                    "homepage": "https://github.com/ravage84",
+                    "role": "Project Maintainer"
+                },
+                {
+                    "name": "Other contributors",
+                    "homepage": "https://github.com/phpmd/phpmd/graphs/contributors",
+                    "role": "Contributors"
+                }
+            ],
+            "description": "PHPMD is a spin-off project of PHP Depend and aims to be a PHP equivalent of the well known Java tool PMD.",
+            "homepage": "https://phpmd.org/",
+            "keywords": [
+                "dev",
+                "mess detection",
+                "mess detector",
+                "pdepend",
+                "phpmd",
+                "pmd"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/phpmd",
+                "issues": "https://github.com/phpmd/phpmd/issues",
+                "source": "https://github.com/phpmd/phpmd/tree/2.15.0"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpmd/phpmd",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-12-11T08:22:20+00:00"
+        },
         {
             "name": "phpstan/phpstan",
-            "version": "2.1.31",
+            "version": "2.1.40",
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/ead89849d879fe203ce9292c6ef5e7e76f867b96",
-                "reference": "ead89849d879fe203ce9292c6ef5e7e76f867b96",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/9b2c7aeb83a75d8680ea5e7c9b7fca88052b766b",
+                "reference": "9b2c7aeb83a75d8680ea5e7c9b7fca88052b766b",
                 "shasum": ""
             },
             "require": {
@@ -398,27 +689,27 @@
                     "type": "github"
                 }
             ],
-            "time": "2025-10-10T14:14:11+00:00"
+            "time": "2026-02-23T15:04:35+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "12.4.0",
+            "version": "12.5.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "67e8aed88f93d0e6e1cb7effe1a2dfc2fee6022c"
+                "reference": "b015312f28dd75b75d3422ca37dff2cd1a565e8d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/67e8aed88f93d0e6e1cb7effe1a2dfc2fee6022c",
-                "reference": "67e8aed88f93d0e6e1cb7effe1a2dfc2fee6022c",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/b015312f28dd75b75d3422ca37dff2cd1a565e8d",
+                "reference": "b015312f28dd75b75d3422ca37dff2cd1a565e8d",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-libxml": "*",
                 "ext-xmlwriter": "*",
-                "nikic/php-parser": "^5.6.1",
+                "nikic/php-parser": "^5.7.0",
                 "php": ">=8.3",
                 "phpunit/php-file-iterator": "^6.0",
                 "phpunit/php-text-template": "^5.0",
@@ -426,10 +717,10 @@
                 "sebastian/environment": "^8.0.3",
                 "sebastian/lines-of-code": "^4.0",
                 "sebastian/version": "^6.0",
-                "theseer/tokenizer": "^1.2.3"
+                "theseer/tokenizer": "^2.0.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^12.3.7"
+                "phpunit/phpunit": "^12.5.1"
             },
             "suggest": {
                 "ext-pcov": "PHP extension that provides line coverage",
@@ -438,7 +729,7 @@
             "type": "library",
             "extra": {
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+                    "url": "https://github.com/symfony/contracts",
+                    "name": "symfony/contracts"
+                },
+                "branch-alias": {
+                    "dev-main": "3.6-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "function.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "A generic function and convention to trigger deprecation notices",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/deprecation-contracts/tree/v3.6.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-09-25T14:21:43+00:00"
+        },
+        {
+            "name": "symfony/filesystem",
+            "version": "v7.4.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/filesystem.git",
+                "reference": "3ebc794fa5315e59fd122561623c2e2e4280538e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/3ebc794fa5315e59fd122561623c2e2e4280538e",
+                "reference": "3ebc794fa5315e59fd122561623c2e2e4280538e",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "symfony/polyfill-ctype": "~1.8",
+                "symfony/polyfill-mbstring": "~1.8"
+            },
+            "require-dev": {
+                "symfony/process": "^6.4|^7.0|^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Filesystem\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Provides basic utilities for the filesystem",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/filesystem/tree/v7.4.6"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2026-02-25T16:50:00+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.33.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "a3cc8b044a6ea513310cbd48ef7333b384945638"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/a3cc8b044a6ea513310cbd48ef7333b384945638",
+                "reference": "a3cc8b044a6ea513310cbd48ef7333b384945638",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2"
+            },
+            "provide": {
+                "ext-ctype": "*"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.33.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-09-09T11:45:10+00:00"
+        },
+        {
+            "name": "symfony/polyfill-mbstring",
+            "version": "v1.33.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
+                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/6d857f4d76bd4b343eac26d6b539585d2bc56493",
+                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493",
+                "shasum": ""
+            },
+            "require": {
+                "ext-iconv": "*",
+                "php": ">=7.2"
+            },
+            "provide": {
+                "ext-mbstring": "*"
+            },
+            "suggest": {
+                "ext-mbstring": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Mbstring\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for the Mbstring extension",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "mbstring",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.33.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-12-23T08:48:59+00:00"
+        },
+        {
+            "name": "symfony/service-contracts",
+            "version": "v3.6.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/service-contracts.git",
+                "reference": "45112560a3ba2d715666a509a0bc9521d10b6c43"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/45112560a3ba2d715666a509a0bc9521d10b6c43",
+                "reference": "45112560a3ba2d715666a509a0bc9521d10b6c43",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1",
+                "psr/container": "^1.1|^2.0",
+                "symfony/deprecation-contracts": "^2.5|^3"
+            },
+            "conflict": {
+                "ext-psr": "<1.1|>=2"
+            },
+            "type": "library",
+            "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/contracts",
+                    "name": "symfony/contracts"
+                },
+                "branch-alias": {
+                    "dev-main": "3.6-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Contracts\\Service\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Test/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Generic abstractions related to writing services",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "abstractions",
+                "contracts",
+                "decoupling",
+                "interfaces",
+                "interoperability",
+                "standards"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/service-contracts/tree/v3.6.1"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-07-15T11:30:57+00:00"
+        },
+        {
+            "name": "symfony/var-exporter",
+            "version": "v7.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/var-exporter.git",
+                "reference": "03a60f169c79a28513a78c967316fbc8bf17816f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/var-exporter/zipball/03a60f169c79a28513a78c967316fbc8bf17816f",
+                "reference": "03a60f169c79a28513a78c967316fbc8bf17816f",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "symfony/deprecation-contracts": "^2.5|^3"
+            },
+            "require-dev": {
+                "symfony/property-access": "^6.4|^7.0|^8.0",
+                "symfony/serializer": "^6.4|^7.0|^8.0",
+                "symfony/var-dumper": "^6.4|^7.0|^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\VarExporter\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Allows exporting any serializable PHP data structure to plain PHP code",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "clone",
+                "construct",
+                "export",
+                "hydrate",
+                "instantiate",
+                "lazy-loading",
+                "proxy",
+                "serialize"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/var-exporter/tree/v7.4.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-09-11T10:15:23+00:00"
+        },
         {
             "name": "theseer/tokenizer",
-            "version": "1.2.3",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
+                "reference": "7989e43bf381af0eac72e4f0ca5bcbfa81658be4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
-                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/7989e43bf381af0eac72e4f0ca5bcbfa81658be4",
+                "reference": "7989e43bf381af0eac72e4f0ca5bcbfa81658be4",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-tokenizer": "*",
                 "ext-xmlwriter": "*",
-                "php": "^7.2 || ^8.0"
+                "php": "^8.1"
             },
             "type": "library",
             "autoload": {
@@ -1828,7 +2950,7 @@
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
             "support": {
                 "issues": "https://github.com/theseer/tokenizer/issues",
-                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
+                "source": "https://github.com/theseer/tokenizer/tree/2.0.1"
             },
             "funding": [
                 {
@@ -1836,7 +2958,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-03-03T12:36:25+00:00"
+            "time": "2025-12-08T11:19:18+00:00"
         }
     ],
     "aliases": [],
@@ -1845,8 +2967,8 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=8.2"
+        "php": ">=8.3"
     },
     "platform-dev": {},
-    "plugin-api-version": "2.6.0"
+    "plugin-api-version": "2.9.0"
 }
diff --git a/phpcs.xml b/phpcs.xml
new file mode 100644
index 0000000..a01f31d
--- /dev/null
+++ b/phpcs.xml
@@ -0,0 +1,65 @@
+<?xml version="1.0"?>
+<ruleset name="PHP.Gt Standard" namespace="Gt\CS\Standard">
+	<description>Created from PHP.Gt/Styleguide</description>
+	<arg name="extensions" value="php" />
+
+	<rule ref="Generic.Classes.DuplicateClassName" />
+	<rule ref="Generic.Classes.OpeningBraceSameLine" />
+	<rule ref="Generic.CodeAnalysis.EmptyPHPStatement" />
+	<rule ref="Generic.CodeAnalysis.EmptyStatement" />
+	<rule ref="Generic.CodeAnalysis.ForLoopShouldBeWhileLoop" />
+	<rule ref="Generic.CodeAnalysis.ForLoopWithTestFunctionCall" />
+	<rule ref="Generic.CodeAnalysis.JumbledIncrementer" />
+	<rule ref="Generic.CodeAnalysis.UnconditionalIfStatement" />
+	<rule ref="Generic.CodeAnalysis.UnnecessaryFinalModifier" />
+	<rule ref="Generic.CodeAnalysis.UnusedFunctionParameter" />
+	<rule ref="Generic.CodeAnalysis.UselessOverridingMethod" />
+	<rule ref="Generic.ControlStructures.InlineControlStructure" />
+	<rule ref="Generic.Files.ByteOrderMark" />
+	<rule ref="Generic.Files.EndFileNewline" />
+	<rule ref="Generic.Files.InlineHTML" />
+	<rule ref="Generic.Files.LineEndings" />
+	<rule ref="Generic.Files.LineLength">
+		<properties>
+			<property name="lineLimit" value="100" />
+			<property name="absoluteLineLimit" value="100" />
+		</properties>
+	</rule>
+	<rule ref="Generic.Files.OneClassPerFile" />
+	<rule ref="Generic.Files.OneInterfacePerFile" />
+	<rule ref="Generic.Files.OneObjectStructurePerFile" />
+	<rule ref="Generic.Files.OneTraitPerFile" />
+	<rule ref="Generic.Formatting.DisallowMultipleStatements" />
+	<rule ref="Generic.Functions.FunctionCallArgumentSpacing" />
+	<rule ref="Generic.Functions.OpeningFunctionBraceKernighanRitchie" />
+	<rule ref="Generic.Metrics.CyclomaticComplexity" />
+	<rule ref="Generic.Metrics.NestingLevel" />
+	<rule ref="Generic.NamingConventions.CamelCapsFunctionName" />
+	<rule ref="Generic.NamingConventions.ConstructorName" />
+	<rule ref="Generic.NamingConventions.UpperCaseConstantName" />
+	<rule ref="Generic.PHP.BacktickOperator" />
+	<rule ref="Generic.PHP.CharacterBeforePHPOpeningTag" />
+	<rule ref="Generic.PHP.DisallowAlternativePHPTags" />
+	<rule ref="Generic.PHP.DisallowRequestSuperglobal" />
+	<rule ref="Generic.PHP.DisallowShortOpenTag" />
+	<rule ref="Generic.PHP.DiscourageGoto" />
+	<rule ref="Generic.PHP.ForbiddenFunctions">
+		<properties>
+			<property name="forbiddenFunctions" type="array">
+				<element key="die" value="null"/>
+				<element key="exit" value="null"/>
+			</property>
+		</properties>
+	</rule>
+	<rule ref="Generic.PHP.LowerCaseConstant" />
+	<rule ref="Generic.PHP.LowerCaseKeyword" />
+	<rule ref="Generic.PHP.LowerCaseType" />
+	<rule ref="Generic.PHP.NoSilencedErrors" />
+	<rule ref="Generic.PHP.Syntax" />
+	<rule ref="Generic.PHP.Syntax" />
+	<rule ref="Generic.VersionControl.GitMergeConflict" />
+	<rule ref="Generic.WhiteSpace.ArbitraryParenthesesSpacing" />
+	<rule ref="Generic.WhiteSpace.DisallowSpaceIndent" />
+	<rule ref="Generic.WhiteSpace.IncrementDecrementSpacing" />
+	<rule ref="Generic.WhiteSpace.LanguageConstructSpacing" />
+</ruleset>
diff --git a/phpmd.xml b/phpmd.xml
new file mode 100644
index 0000000..983dbd8
--- /dev/null
+++ b/phpmd.xml
@@ -0,0 +1,45 @@
+<?xml version="1.0" ?>
+<ruleset name="PHP.Gt ruleset"
+	 xmlns="http://pmd.sf.net/ruleset/1.0.0"
+	 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	 xsi:schemaLocation="http://pmd.sf.net/ruleset/1.0.0 http://pmd.sf.net/ruleset_xml_schema.xsd"
+	 xsi:noNamespaceSchemaLocation="http://pmd.sf.net/ruleset_xml_schema.xsd">
+	<description>Custom ruleset</description>
+
+	<rule ref="rulesets/codesize.xml">
+	</rule>
+
+	<rule ref="rulesets/cleancode.xml">
+		<exclude name="BooleanArgumentFlag" />
+		<exclude name="ElseExpression" />
+		<exclude name="IfStatementAssignment" />
+		<exclude name="StaticAccess" />
+	</rule>
+
+	<rule ref="rulesets/controversial.xml">
+	</rule>
+
+	<rule ref="rulesets/design.xml">
+		<exclude name="NumberOfChildren" />
+	</rule>
+
+	<rule ref="rulesets/naming.xml">
+		<exclude name="ShortMethodName" />
+		<exclude name="ShortVariable" />
+		<exclude name="LongVariable" />
+	</rule>
+
+	<rule ref="rulesets/unusedcode.xml">
+	</rule>
+
+	<rule ref="rulesets/naming.xml/ShortVariable">
+		<properties>
+			<property name="exceptions" value="a,b,i,in" />
+		</properties>
+	</rule>
+	<rule ref="rulesets/naming.xml/ShortMethodName">
+		<properties>
+			<property name="exceptions" value="or,do" />
+		</properties>
+	</rule>
+</ruleset>
diff --git a/phpunit.xml b/phpunit.xml
index 29ea50e..aacb03a 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,27 +1,28 @@
 <?xml version="1.0"?>
 <phpunit
-        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        colors="true"
-        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.2/phpunit.xsd"
-        displayDetailsOnTestsThatTriggerWarnings="true"
-        displayDetailsOnTestsThatTriggerDeprecations="true"
-        displayDetailsOnTestsThatTriggerErrors="true"
-        displayDetailsOnTestsThatTriggerNotices="true"
-        cacheDirectory="test/phpunit/_cache"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+	colors="true"
+	cacheDirectory="test/phpunit/.phpunit.cache"
+	bootstrap="vendor/autoload.php"
+	displayDetailsOnTestsThatTriggerDeprecations="true"
+	displayDetailsOnPhpunitDeprecations="true"
 >
-  <coverage />
+	<source>
+		<include>
+			<directory>src</directory>
+		</include>
+	</source>
 
-  <testsuites>
-    <testsuite name="main">
-      <directory suffix="Test.php">./test/phpunit</directory>
-    </testsuite>
-  </testsuites>
+	<coverage />
 
-  <logging />
+	<testsuites>
+		<testsuite name="main">
+			<directory>
+				./test/phpunit/
+			</directory>
+		</testsuite>
+	</testsuites>
 
-  <source>
-    <include>
-      <directory>./src</directory>
-    </include>
-  </source>
+	<logging />
 </phpunit>
diff --git a/src/Config.php b/src/Config.php
index bb76da8..9cd2cf2 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -54,7 +54,8 @@ public function getSectionNames():array {
 
 	/**
 	 * Merge another Config into this instance immutably, returning a new Config.
-	 * Existing values are preserved; only missing keys/sections are filled from the overriding config.
+	 * Existing values are preserved.
+	 * Only missing keys and sections are filled from the overriding config.
 	 */
 	public function withMerge(Config $configToOverride): self {
 		// Start with current sections
@@ -65,7 +66,7 @@ public function withMerge(Config $configToOverride): self {
 			if(isset($mergedSectionList[$sectionName])) {
 				// Fill only missing keys from override into existing section
 				foreach($overrideSection as $key => $value) {
-					if(empty($mergedSectionList[$sectionName][$key])) {
+					if(!$mergedSectionList[$sectionName]->contains($key)) {
 						$mergedSectionList[$sectionName] = $mergedSectionList[$sectionName]->with($key, $value);
 					}
 				}
@@ -80,10 +81,15 @@ public function withMerge(Config $configToOverride): self {
 	}
 
 	/**
-	 * @deprecated Use withMerge() for an immutable alternative. This method will be removed in a future major release.
+	 * @deprecated Use withMerge() for an immutable alternative.
+	 * This method will be removed in a future major release.
 	 */
 	public function merge(Config $configToOverride):void {
-		@trigger_error("Config::merge() is deprecated. Use Config::withMerge() for an immutable merge.", E_USER_DEPRECATED);
+		trigger_error(
+			"Config::merge() is deprecated. "
+			. "Use Config::withMerge() for an immutable merge.",
+			E_USER_DEPRECATED
+		);
 		$new = $this->withMerge($configToOverride);
 		$this->sectionList = $new->sectionList;
 	}
diff --git a/src/ConfigException.php b/src/ConfigException.php
index 6fae3f9..38d50ec 100644
--- a/src/ConfigException.php
+++ b/src/ConfigException.php
@@ -3,4 +3,4 @@
 
 use RuntimeException;
 
-class ConfigException extends RuntimeException {}
\ No newline at end of file
+class ConfigException extends RuntimeException {}
diff --git a/src/ConfigFactory.php b/src/ConfigFactory.php
index 678299c..759e959 100644
--- a/src/ConfigFactory.php
+++ b/src/ConfigFactory.php
@@ -36,12 +36,12 @@ public static function createForProject(
 				$fileName .= ".";
 			}
 
-			$fileName .= self::EXTENSION;
-			$config = self::createFromPathName(
-				implode(DIRECTORY_SEPARATOR,[
-					$projectRoot,
-					$fileName,
-				])
+				$fileName .= self::EXTENSION;
+				$config = self::createFromPathName(
+					implode(DIRECTORY_SEPARATOR, [
+						$projectRoot,
+						$fileName,
+					])
 			);
 			if(is_null($config)) {
 				continue;
diff --git a/src/ConfigSection.php b/src/ConfigSection.php
index ddffa86..226586b 100644
--- a/src/ConfigSection.php
+++ b/src/ConfigSection.php
@@ -2,33 +2,37 @@
 namespace Gt\Config;
 
 use ArrayAccess;
+use ArrayIterator;
 use BadMethodCallException;
 use Gt\TypeSafeGetter\NullableTypeSafeGetter;
-use Iterator;
+use IteratorAggregate;
+use Traversable;
 
 /**
  * @implements ArrayAccess<string, string>
- * @implements Iterator<string, string>
+ * @implements IteratorAggregate<string, string>
  */
-class ConfigSection implements ArrayAccess, Iterator {
+class ConfigSection implements ArrayAccess, IteratorAggregate {
 	use NullableTypeSafeGetter;
 
 	protected string $name;
 	/** @var array<string, string> */
 	protected array $data;
-	protected int $iteratorIndex;
 
 	/** @param array<string, string> $data */
 	public function __construct(string $name, array $data) {
 		$this->name = $name;
 		$this->data = $data;
-		$this->iteratorIndex = 0;
 	}
 
 	public function get(string $name):?string {
 		return $this->data[$name] ?? null;
 	}
 
+	public function contains(string $name):bool {
+		return array_key_exists($name, $this->data);
+	}
+
 	public function with(string $key, string $value):static {
 		$clone = clone $this;
 		$clone->data[$key] = $value;
@@ -36,40 +40,11 @@ public function with(string $key, string $value):static {
 	}
 
 	/**
-	 * @link http://php.net/manual/en/iterator.current.php
-	 */
-	public function current():string {
-		$key = $this->getIteratorKey();
-		return $this->data[$key];
-	}
-
-	/**
-	 * @link http://php.net/manual/en/iterator.next.php
-	 */
-	public function next():void {
-		$this->iteratorIndex++;
-	}
-
-	/**
-	 * @link http://php.net/manual/en/iterator.key.php
+	 * @return Traversable<string, string>
+	 * @link http://php.net/manual/en/iteratoraggregate.getiterator.php
 	 */
-	public function key():?string {
-		return $this->getIteratorKey();
-	}
-
-	/**
-	 * @link http://php.net/manual/en/iterator.valid.php
-	 */
-	public function valid():bool {
-		$key = $this->getIteratorKey();
-		return isset($this->data[$key]);
-	}
-
-	/**
-	 * @link http://php.net/manual/en/iterator.rewind.php
-	 */
-	public function rewind():void {
-		$this->iteratorIndex = 0;
+	public function getIterator():Traversable {
+		return new ArrayIterator($this->data);
 	}
 
 	/**
@@ -90,22 +65,25 @@ public function offsetGet($offset):?string {
 	 * @link http://php.net/manual/en/arrayaccess.offsetset.php
 	 */
 	public function offsetSet($offset, $value):void {
-		throw new BadMethodCallException("Immutable object can not be mutated");
+		throw new BadMethodCallException(
+			"Immutable object can not be mutated: "
+			. (string)$offset
+			. "="
+			. (string)$value
+		);
 	}
 
 	/**
 	 * @link http://php.net/manual/en/arrayaccess.offsetunset.php
 	 */
 	public function offsetUnset($offset):void {
-		throw new BadMethodCallException("Immutable object can not be mutated");
+		throw new BadMethodCallException(
+			"Immutable object can not be mutated: "
+			. (string)$offset
+		);
 	}
 
 	public function getName():string {
 		return $this->name;
 	}
-
-	protected function getIteratorKey():?string {
-		$keys = array_keys($this->data);
-		return $keys[$this->iteratorIndex] ?? null;
-	}
-}
\ No newline at end of file
+}
diff --git a/src/FileWriter.php b/src/FileWriter.php
index 48cb983..403dce3 100644
--- a/src/FileWriter.php
+++ b/src/FileWriter.php
@@ -35,4 +35,4 @@ public function writeIni(string $filePath):void {
 			throw new ConfigException("Unable to write to file: $filePath");
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/src/Generator.php b/src/Generator.php
index ddc00e7..a4d4391 100644
--- a/src/Generator.php
+++ b/src/Generator.php
@@ -113,4 +113,4 @@ protected function getSectionData(array $sectionList):array {
 
 		return $result;
 	}
-}
\ No newline at end of file
+}
diff --git a/src/IniParser.php b/src/IniParser.php
index 92540b8..370f284 100644
--- a/src/IniParser.php
+++ b/src/IniParser.php
@@ -23,4 +23,4 @@ public function parse():Config {
 
 		return new Config(...$configSectionList);
 	}
-}
\ No newline at end of file
+}
diff --git a/src/InvalidArgumentException.php b/src/InvalidArgumentException.php
index 6404ef5..04d0a93 100644
--- a/src/InvalidArgumentException.php
+++ b/src/InvalidArgumentException.php
@@ -1,4 +1,4 @@
 <?php
 namespace Gt\Config;
 
-class InvalidArgumentException extends ConfigException {}
\ No newline at end of file
+class InvalidArgumentException extends ConfigException {}
diff --git a/test/phpunit/ConfigFactoryConfigTest.php b/test/phpunit/ConfigFactoryConfigTest.php
index d3c43f1..ac6ac9f 100644
--- a/test/phpunit/ConfigFactoryConfigTest.php
+++ b/test/phpunit/ConfigFactoryConfigTest.php
@@ -52,4 +52,35 @@ public function testCreateFromPathName():void {
 		self::assertContains("database", $sectionNames);
 		self::assertNotContains("extra", $sectionNames);
 	}
+
+	public function testCreateForProjectPreservesFalseyOverrides():void {
+		$filePath = implode(DIRECTORY_SEPARATOR, [
+			$this->tmp,
+			"config.ini",
+		]);
+		$filePathDefault = implode(DIRECTORY_SEPARATOR, [
+			$this->tmp,
+			"config.default.ini",
+		]);
+
+		file_put_contents($filePathDefault, implode(PHP_EOL, [
+			"[session]",
+			"use_cookies=true",
+			"max_age=60",
+			'label="default"',
+			"",
+		]));
+		file_put_contents($filePath, implode(PHP_EOL, [
+			"[session]",
+			"use_cookies=false",
+			"max_age=0",
+			'label=""',
+			"",
+		]));
+
+		$config = ConfigFactory::createForProject($this->tmp);
+		self::assertFalse($config->getBool("session.use_cookies"));
+		self::assertSame(0, $config->getInt("session.max_age"));
+		self::assertSame("", $config->getString("session.label"));
+	}
 }
diff --git a/test/phpunit/ConfigTest.php b/test/phpunit/ConfigTest.php
index 98124c7..edf6433 100644
--- a/test/phpunit/ConfigTest.php
+++ b/test/phpunit/ConfigTest.php
@@ -92,15 +92,19 @@ public function testWithMergeReturnsNewAndDoesNotMutateOriginal():void {
 		// Ensure new instance returned
 		self::assertNotSame($original, $merged);
 
-		// Original remains unchanged (use section access to avoid env var interference)
-		self::assertSame("ExampleAppOriginal", $original->getSection("app")->get("namespace"));
-		self::assertNull($original->getSection("app")->get("extra"));
-		self::assertNull($original->getSection("cache"));
-
-		// Merged config has expected values
-		self::assertSame("ExampleAppOriginal", $merged->getSection("app")->get("namespace")); // existing preserved
-		self::assertSame("value", $merged->getSection("app")->get("extra")); // new key added
-		self::assertSame("1", $merged->getSection("cache")->get("enabled")); // new section added
+			// Original remains unchanged.
+			// Use section access to avoid env var interference.
+			self::assertSame("ExampleAppOriginal", $original->getSection("app")->get("namespace"));
+			self::assertNull($original->getSection("app")->get("extra"));
+			self::assertNull($original->getSection("cache"));
+
+			// Merged config has expected values
+			self::assertSame(
+				"ExampleAppOriginal",
+				$merged->getSection("app")->get("namespace")
+			); // existing preserved
+			self::assertSame("value", $merged->getSection("app")->get("extra")); // new key added
+			self::assertSame("1", $merged->getSection("cache")->get("enabled")); // new section added
 	}
 
 	public function testMergeEmitsDeprecationAndMutates():void {
@@ -118,6 +122,7 @@ public function testMergeEmitsDeprecationAndMutates():void {
 		$deprecationCount = 0;
 		set_error_handler(function(int $errno, string $errstr) use (&$deprecationCount) {
 			if($errno === E_USER_DEPRECATED) {
+				self::assertStringContainsString("Config::merge() is deprecated", $errstr);
 				$deprecationCount++;
 			}
 			return true; // prevent PHPUnit from handling
diff --git a/test/phpunit/GeneratorConfigTest.php b/test/phpunit/GeneratorConfigTest.php
index db0a2ef..5c443bf 100644
--- a/test/phpunit/GeneratorConfigTest.php
+++ b/test/phpunit/GeneratorConfigTest.php
@@ -29,7 +29,7 @@ public function testGenerateDisallowedSuffix() {
 		new Generator(["config-generate", "meow", "test"]);
 	}
 
-	public function testGenerateNoKVP() {
+	public function testGenerateNoKvp() {
 		self::expectException(InvalidArgumentException::class);
 		self::expectExceptionMessage("Invalid key-value pair: test");
 		new Generator(["config-generate", "dev", "test"]);
@@ -38,11 +38,15 @@ public function testGenerateNoKVP() {
 	public function testGenerateNoSection() {
 		self::expectException(InvalidArgumentException::class);
 		self::expectExceptionMessage("Invalid key-value pair: testkey");
-		$sut = new Generator(["config-generate", "dev", "testkey=testvalue"]);
+		new Generator(["config-generate", "dev", "testkey=testvalue"]);
 	}
 
 	public function testGenerate() {
-		$sut = new Generator(["config-generate", "dev", "testsection.testkey=testvalue"]);
+		$sut = new Generator([
+			"config-generate",
+			"dev",
+			"testsection.testkey=testvalue",
+		]);
 		$sut->generate();
 		$filePath = $this->tmp . "/config.dev.ini";
 		self::assertFileExists($filePath);
diff --git a/test/phpunit/Helper/Helper.php b/test/phpunit/Helper/Helper.php
index ab7dadd..b674939 100644
--- a/test/phpunit/Helper/Helper.php
+++ b/test/phpunit/Helper/Helper.php
@@ -86,4 +86,4 @@ public static function recursiveRemove(string $dir) {
 
 		rmdir($dir);
 	}
-}
\ No newline at end of file
+}