diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 4fb1482..a7ebf09 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -18,7 +18,7 @@ jobs:
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "7.4"
+          php-version: "8.0"
       - name: "Install Dependencies"
         uses: "ramsey/composer-install@v1"
         with:
diff --git a/.github/workflows/integration-tests.yml b/.github/workflows/integration-tests.yml
index e791c99..052e0c9 100644
--- a/.github/workflows/integration-tests.yml
+++ b/.github/workflows/integration-tests.yml
@@ -18,13 +18,19 @@ jobs:
         dependencies:
           - "--prefer-lowest"
           - ""
+        php-version:
+          - "8.0"
+          - "7.4"
+          - "7.3"
+          - "7.2"
+          - "7.1"
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v2"
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "7.4"
+          php-version: "${{ matrix.php-version }}"
       - name: "Change Working Directory"
         run: "cd test/integration"
       - name: "Install dependencies"
diff --git a/.github/workflows/mutation-tests.yml b/.github/workflows/mutation-tests.yml
index 093021d..e9d4fb6 100644
--- a/.github/workflows/mutation-tests.yml
+++ b/.github/workflows/mutation-tests.yml
@@ -18,7 +18,7 @@ jobs:
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "7.4"
+          php-version: "8.0"
       - name: "Install dependencies"
         uses: "ramsey/composer-install@v1"
         with:
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 9137eb4..459eb4e 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -20,6 +20,7 @@ jobs:
           - "lowest"
           - "highest"
         php-version:
+          - "8.0"
           - "7.4"
           - "7.3"
           - "7.2"
diff --git a/composer.json b/composer.json
index 5faa01a..3af9902 100644
--- a/composer.json
+++ b/composer.json
@@ -23,17 +23,17 @@
         }
     },
     "require": {
-        "php": "^7.1",
+        "php": "^7.1 || ^8.0",
         "container-interop/container-interop": "^1.0",
         "monolog/monolog": "^1.3 || ^2.0",
         "laminas/laminas-stdlib": "^3",
         "laminas/laminas-servicemanager": "^3"
     },
     "require-dev": {
-        "jakub-onderka/php-parallel-lint": "^1.0",
         "johnkary/phpunit-speedtrap": "^3.0",
         "squizlabs/php_codesniffer": "^3.0",
-        "phpunit/phpunit": "^7.5.20 || ^8.5.2"
+        "phpunit/phpunit": "^7.5.20 || ^8.5.2 || ^9.5.6",
+        "php-parallel-lint/php-parallel-lint": "^1.3"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
index b2dcc73..cf74889 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": "69559dfb65e9ea2d3e292452ae48bc56",
+    "content-hash": "abd6d0e493d70ae79d6bb48b50af067e",
     "packages": [
         {
             "name": "container-interop/container-interop",
@@ -131,16 +131,16 @@
         },
         {
             "name": "laminas/laminas-stdlib",
-            "version": "3.3.1",
+            "version": "3.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laminas/laminas-stdlib.git",
-                "reference": "d81c7ffe602ed0e6ecb18691019111c0f4bf1efe"
+                "reference": "e89c2268c9cad25099f562f7f015c28c5dd383c9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laminas/laminas-stdlib/zipball/d81c7ffe602ed0e6ecb18691019111c0f4bf1efe",
-                "reference": "d81c7ffe602ed0e6ecb18691019111c0f4bf1efe",
+                "url": "https://api.github.com/repos/laminas/laminas-stdlib/zipball/e89c2268c9cad25099f562f7f015c28c5dd383c9",
+                "reference": "e89c2268c9cad25099f562f7f015c28c5dd383c9",
                 "shasum": ""
             },
             "require": {
@@ -151,9 +151,11 @@
                 "zendframework/zend-stdlib": "^3.2.1"
             },
             "require-dev": {
-                "laminas/laminas-coding-standard": "~1.0.0",
+                "laminas/laminas-coding-standard": "~2.3.0",
                 "phpbench/phpbench": "^0.17.1",
-                "phpunit/phpunit": "~9.3.7"
+                "phpunit/phpunit": "~9.3.7",
+                "psalm/plugin-phpunit": "^0.16.0",
+                "vimeo/psalm": "^4.7"
             },
             "type": "library",
             "autoload": {
@@ -185,7 +187,7 @@
                     "type": "community_bridge"
                 }
             ],
-            "time": "2020-11-19T20:18:59+00:00"
+            "time": "2021-06-28T21:37:31+00:00"
         },
         {
             "name": "laminas/laminas-zendframework-bridge",
@@ -514,59 +516,6 @@
             ],
             "time": "2020-11-10T18:47:58+00:00"
         },
-        {
-            "name": "jakub-onderka/php-parallel-lint",
-            "version": "v1.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/JakubOnderka/PHP-Parallel-Lint.git",
-                "reference": "04fbd3f5fb1c83f08724aa58a23db90bd9086ee8"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/JakubOnderka/PHP-Parallel-Lint/zipball/04fbd3f5fb1c83f08724aa58a23db90bd9086ee8",
-                "reference": "04fbd3f5fb1c83f08724aa58a23db90bd9086ee8",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3"
-            },
-            "require-dev": {
-                "jakub-onderka/php-console-highlighter": "~0.3",
-                "nette/tester": "~1.3",
-                "squizlabs/php_codesniffer": "~2.7"
-            },
-            "suggest": {
-                "jakub-onderka/php-console-highlighter": "Highlight syntax in code snippet"
-            },
-            "bin": [
-                "parallel-lint"
-            ],
-            "type": "library",
-            "autoload": {
-                "classmap": [
-                    "./"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-2-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Jakub Onderka",
-                    "email": "ahoj@jakubonderka.cz"
-                }
-            ],
-            "description": "This tool check syntax of PHP files about 20x faster than serial check.",
-            "homepage": "https://github.com/JakubOnderka/PHP-Parallel-Lint",
-            "support": {
-                "issues": "https://github.com/JakubOnderka/PHP-Parallel-Lint/issues",
-                "source": "https://github.com/JakubOnderka/PHP-Parallel-Lint/tree/master"
-            },
-            "abandoned": "php-parallel-lint/php-parallel-lint",
-            "time": "2018-02-24T15:31:20+00:00"
-        },
         {
             "name": "johnkary/phpunit-speedtrap",
             "version": "v3.3.0",
@@ -677,6 +626,62 @@
             ],
             "time": "2020-11-13T09:40:50+00:00"
         },
+        {
+            "name": "nikic/php-parser",
+            "version": "v4.10.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "4432ba399e47c66624bc73c8c0f811e5c109576f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/4432ba399e47c66624bc73c8c0f811e5c109576f",
+                "reference": "4432ba399e47c66624bc73c8c0f811e5c109576f",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0 || ^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.10.5"
+            },
+            "time": "2021-05-03T19:11:20+00:00"
+        },
         {
             "name": "phar-io/manifest",
             "version": "2.0.1",
@@ -788,6 +793,63 @@
             },
             "time": "2021-02-23T14:00:09+00:00"
         },
+        {
+            "name": "php-parallel-lint/php-parallel-lint",
+            "version": "v1.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-parallel-lint/PHP-Parallel-Lint.git",
+                "reference": "772a954e5f119f6f5871d015b23eabed8cbdadfb"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-parallel-lint/PHP-Parallel-Lint/zipball/772a954e5f119f6f5871d015b23eabed8cbdadfb",
+                "reference": "772a954e5f119f6f5871d015b23eabed8cbdadfb",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "php": ">=5.3.0"
+            },
+            "replace": {
+                "grogy/php-parallel-lint": "*",
+                "jakub-onderka/php-parallel-lint": "*"
+            },
+            "require-dev": {
+                "nette/tester": "^1.3 || ^2.0",
+                "php-parallel-lint/php-console-highlighter": "~0.3",
+                "squizlabs/php_codesniffer": "^3.5"
+            },
+            "suggest": {
+                "php-parallel-lint/php-console-highlighter": "Highlight syntax in code snippet"
+            },
+            "bin": [
+                "parallel-lint"
+            ],
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "./"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-2-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jakub Onderka",
+                    "email": "ahoj@jakubonderka.cz"
+                }
+            ],
+            "description": "This tool check syntax of PHP files about 20x faster than serial check.",
+            "homepage": "https://github.com/php-parallel-lint/PHP-Parallel-Lint",
+            "support": {
+                "issues": "https://github.com/php-parallel-lint/PHP-Parallel-Lint/issues",
+                "source": "https://github.com/php-parallel-lint/PHP-Parallel-Lint/tree/v1.3.0"
+            },
+            "time": "2021-04-07T14:42:48+00:00"
+        },
         {
             "name": "phpdocumentor/reflection-common",
             "version": "2.2.0",
@@ -1015,40 +1077,44 @@
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "7.0.14",
+            "version": "9.2.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "bb7c9a210c72e4709cdde67f8b7362f672f2225c"
+                "reference": "f6293e1b30a2354e8428e004689671b83871edde"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/bb7c9a210c72e4709cdde67f8b7362f672f2225c",
-                "reference": "bb7c9a210c72e4709cdde67f8b7362f672f2225c",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/f6293e1b30a2354e8428e004689671b83871edde",
+                "reference": "f6293e1b30a2354e8428e004689671b83871edde",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
+                "ext-libxml": "*",
                 "ext-xmlwriter": "*",
-                "php": ">=7.2",
-                "phpunit/php-file-iterator": "^2.0.2",
-                "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-token-stream": "^3.1.1 || ^4.0",
-                "sebastian/code-unit-reverse-lookup": "^1.0.1",
-                "sebastian/environment": "^4.2.2",
-                "sebastian/version": "^2.0.1",
-                "theseer/tokenizer": "^1.1.3"
+                "nikic/php-parser": "^4.10.2",
+                "php": ">=7.3",
+                "phpunit/php-file-iterator": "^3.0.3",
+                "phpunit/php-text-template": "^2.0.2",
+                "sebastian/code-unit-reverse-lookup": "^2.0.2",
+                "sebastian/complexity": "^2.0",
+                "sebastian/environment": "^5.1.2",
+                "sebastian/lines-of-code": "^1.0.3",
+                "sebastian/version": "^3.0.1",
+                "theseer/tokenizer": "^1.2.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^8.2.2"
+                "phpunit/phpunit": "^9.3"
             },
             "suggest": {
-                "ext-xdebug": "^2.7.2"
+                "ext-pcov": "*",
+                "ext-xdebug": "*"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "7.0-dev"
+                    "dev-master": "9.2-dev"
                 }
             },
             "autoload": {
@@ -1076,7 +1142,7 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
-                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/7.0.14"
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.6"
             },
             "funding": [
                 {
@@ -1084,32 +1150,32 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-12-02T13:39:03+00:00"
+            "time": "2021-03-28T07:26:59+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
-            "version": "2.0.3",
+            "version": "3.0.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
-                "reference": "4b49fb70f067272b659ef0174ff9ca40fdaa6357"
+                "reference": "aa4be8575f26070b100fccb67faabb28f21f66f8"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/4b49fb70f067272b659ef0174ff9ca40fdaa6357",
-                "reference": "4b49fb70f067272b659ef0174ff9ca40fdaa6357",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/aa4be8575f26070b100fccb67faabb28f21f66f8",
+                "reference": "aa4be8575f26070b100fccb67faabb28f21f66f8",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
+                "php": ">=7.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "^8.5"
+                "phpunit/phpunit": "^9.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "3.0-dev"
                 }
             },
             "autoload": {
@@ -1136,7 +1202,7 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
-                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/2.0.3"
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/3.0.5"
             },
             "funding": [
                 {
@@ -1144,26 +1210,38 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-11-30T08:25:21+00:00"
+            "time": "2020-09-28T05:57:25+00:00"
         },
         {
-            "name": "phpunit/php-text-template",
-            "version": "1.2.1",
+            "name": "phpunit/php-invoker",
+            "version": "3.1.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/sebastianbergmann/php-text-template.git",
-                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686"
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
+                "reference": "5a10147d0aaf65b58940a0b72f71c9ac0423cc67"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/31f8b717e51d9a2afca6c9f046f5d69fc27c8686",
-                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-invoker/zipball/5a10147d0aaf65b58940a0b72f71c9ac0423cc67",
+                "reference": "5a10147d0aaf65b58940a0b72f71c9ac0423cc67",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "ext-pcntl": "*",
+                "phpunit/phpunit": "^9.3"
+            },
+            "suggest": {
+                "ext-pcntl": "*"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.1-dev"
+                }
+            },
             "autoload": {
                 "classmap": [
                     "src/"
@@ -1180,41 +1258,47 @@
                     "role": "lead"
                 }
             ],
-            "description": "Simple template engine.",
-            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
+            "description": "Invoke callables with a timeout",
+            "homepage": "https://github.com/sebastianbergmann/php-invoker/",
             "keywords": [
-                "template"
+                "process"
             ],
             "support": {
-                "issues": "https://github.com/sebastianbergmann/php-text-template/issues",
-                "source": "https://github.com/sebastianbergmann/php-text-template/tree/1.2.1"
+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
+                "source": "https://github.com/sebastianbergmann/php-invoker/tree/3.1.1"
             },
-            "time": "2015-06-21T13:50:34+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T05:58:55+00:00"
         },
         {
-            "name": "phpunit/php-timer",
-            "version": "2.1.3",
+            "name": "phpunit/php-text-template",
+            "version": "2.0.4",
             "source": {
                 "type": "git",
-                "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "2454ae1765516d20c4ffe103d85a58a9a3bd5662"
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
+                "reference": "5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/2454ae1765516d20c4ffe103d85a58a9a3bd5662",
-                "reference": "2454ae1765516d20c4ffe103d85a58a9a3bd5662",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28",
+                "reference": "5da5f67fc95621df9ff4c4e5a84d6a8a2acf7c28",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
+                "php": ">=7.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "^8.5"
+                "phpunit/phpunit": "^9.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.1-dev"
+                    "dev-master": "2.0-dev"
                 }
             },
             "autoload": {
@@ -1233,14 +1317,14 @@
                     "role": "lead"
                 }
             ],
-            "description": "Utility class for timing",
-            "homepage": "https://github.com/sebastianbergmann/php-timer/",
+            "description": "Simple template engine.",
+            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
             "keywords": [
-                "timer"
+                "template"
             ],
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-                "reference": "6b853149eab67d4da22291d36f5b0631c0fd856e",
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+                "php": ">=7.3",
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+                    "dev-master": "4.0-dev"
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@@ -1732,7 +1990,7 @@
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                 "issues": "https://github.com/sebastianbergmann/exporter/issues",
-                "source": "https://github.com/sebastianbergmann/exporter/tree/3.1.3"
+                "source": "https://github.com/sebastianbergmann/exporter/tree/4.0.3"
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@@ -1740,30 +1998,30 @@
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-            "time": "2020-11-30T07:47:53+00:00"
+            "time": "2020-09-28T05:24:23+00:00"
         },
         {
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-            "version": "3.0.1",
+            "version": "5.0.3",
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                 "url": "https://github.com/sebastianbergmann/global-state.git",
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-                "reference": "474fb9edb7ab891665d3bfc6317f42a0a150454b",
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+                "php": ">=7.3",
+                "sebastian/object-reflector": "^2.0",
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             "require-dev": {
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-                "phpunit/phpunit": "^8.0"
+                "phpunit/phpunit": "^9.3"
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@@ -1771,7 +2029,7 @@
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+                    "dev-master": "5.0-dev"
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@@ -1796,7 +2054,64 @@
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                 "issues": "https://github.com/sebastianbergmann/global-state/issues",
-                "source": "https://github.com/sebastianbergmann/global-state/tree/3.0.1"
+                "source": "https://github.com/sebastianbergmann/global-state/tree/5.0.3"
+            },
+            "funding": [
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+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
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+            "time": "2021-06-11T13:31:12+00:00"
+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "1.0.3",
+            "source": {
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+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+                "reference": "c1c2e997aa3146983ed888ad08b15470a2e22ecc"
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+                "reference": "c1c2e997aa3146983ed888ad08b15470a2e22ecc",
+                "shasum": ""
+            },
+            "require": {
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+                "php": ">=7.3"
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+            "require-dev": {
+                "phpunit/phpunit": "^9.3"
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+            "type": "library",
+            "extra": {
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+            "autoload": {
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
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+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/1.0.3"
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@@ -1804,34 +2119,34 @@
                     "type": "github"
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-            "time": "2020-11-30T07:43:24+00:00"
+            "time": "2020-11-28T06:42:11+00:00"
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         {
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-            "version": "3.0.4",
+            "version": "4.0.4",
             "source": {
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                 "url": "https://github.com/sebastianbergmann/object-enumerator.git",
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-                "reference": "e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/5c9eeac41b290a3712d88851518825ad78f45c71",
+                "reference": "5c9eeac41b290a3712d88851518825ad78f45c71",
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-                "php": ">=7.0",
-                "sebastian/object-reflector": "^1.1.1",
-                "sebastian/recursion-context": "^3.0"
+                "php": ">=7.3",
+                "sebastian/object-reflector": "^2.0",
+                "sebastian/recursion-context": "^4.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^9.3"
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             "extra": {
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-                    "dev-master": "3.0.x-dev"
+                    "dev-master": "4.0-dev"
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@@ -1853,7 +2168,7 @@
             "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
             "support": {
                 "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
-                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/3.0.4"
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/4.0.4"
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@@ -1861,32 +2176,32 @@
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                 }
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-            "time": "2020-11-30T07:40:27+00:00"
+            "time": "2020-10-26T13:12:34+00:00"
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-            "version": "1.1.2",
+            "version": "2.0.4",
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                 "url": "https://github.com/sebastianbergmann/object-reflector.git",
-                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d"
+                "reference": "b4f479ebdbf63ac605d183ece17d8d7fe49c15c7"
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-                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/b4f479ebdbf63ac605d183ece17d8d7fe49c15c7",
+                "reference": "b4f479ebdbf63ac605d183ece17d8d7fe49c15c7",
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             "require": {
-                "php": ">=7.0"
+                "php": ">=7.3"
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             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^9.3"
             },
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             "extra": {
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-                    "dev-master": "1.1-dev"
+                    "dev-master": "2.0-dev"
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@@ -1908,7 +2223,7 @@
             "homepage": "https://github.com/sebastianbergmann/object-reflector/",
             "support": {
                 "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
-                "source": "https://github.com/sebastianbergmann/object-reflector/tree/1.1.2"
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/2.0.4"
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@@ -1916,32 +2231,32 @@
                     "type": "github"
                 }
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-            "time": "2020-11-30T07:37:18+00:00"
+            "time": "2020-10-26T13:14:26+00:00"
         },
         {
             "name": "sebastian/recursion-context",
-            "version": "3.0.1",
+            "version": "4.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/recursion-context.git",
-                "reference": "367dcba38d6e1977be014dc4b22f47a484dac7fb"
+                "reference": "cd9d8cf3c5804de4341c283ed787f099f5506172"
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-                "reference": "367dcba38d6e1977be014dc4b22f47a484dac7fb",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/cd9d8cf3c5804de4341c283ed787f099f5506172",
+                "reference": "cd9d8cf3c5804de4341c283ed787f099f5506172",
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             "require": {
-                "php": ">=7.0"
+                "php": ">=7.3"
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+                "phpunit/phpunit": "^9.3"
             },
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             "extra": {
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-                    "dev-master": "3.0.x-dev"
+                    "dev-master": "4.0-dev"
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@@ -1971,7 +2286,7 @@
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
             "support": {
                 "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
-                "source": "https://github.com/sebastianbergmann/recursion-context/tree/3.0.1"
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/4.0.4"
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                 {
@@ -1979,29 +2294,32 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-11-30T07:34:24+00:00"
+            "time": "2020-10-26T13:17:30+00:00"
         },
         {
             "name": "sebastian/resource-operations",
-            "version": "2.0.2",
+            "version": "3.0.3",
             "source": {
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                 "url": "https://github.com/sebastianbergmann/resource-operations.git",
-                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3"
+                "reference": "0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8"
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-                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8",
+                "reference": "0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0-dev"
+                    "dev-master": "3.0-dev"
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@@ -2023,7 +2341,7 @@
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
             "support": {
                 "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
-                "source": "https://github.com/sebastianbergmann/resource-operations/tree/2.0.2"
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.3"
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@@ -2031,32 +2349,32 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-11-30T07:30:19+00:00"
+            "time": "2020-09-28T06:45:17+00:00"
         },
         {
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-            "version": "1.1.4",
+            "version": "2.3.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/type.git",
-                "reference": "0150cfbc4495ed2df3872fb31b26781e4e077eb4"
+                "reference": "b8cd8a1c753c90bc1a0f5372170e3e489136f914"
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-                "reference": "0150cfbc4495ed2df3872fb31b26781e4e077eb4",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/b8cd8a1c753c90bc1a0f5372170e3e489136f914",
+                "reference": "b8cd8a1c753c90bc1a0f5372170e3e489136f914",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2"
+                "php": ">=7.3"
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             "require-dev": {
-                "phpunit/phpunit": "^8.2"
+                "phpunit/phpunit": "^9.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.1-dev"
+                    "dev-master": "2.3-dev"
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@@ -2079,7 +2397,7 @@
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             "support": {
                 "issues": "https://github.com/sebastianbergmann/type/issues",
-                "source": "https://github.com/sebastianbergmann/type/tree/1.1.4"
+                "source": "https://github.com/sebastianbergmann/type/tree/2.3.4"
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@@ -2087,29 +2405,29 @@
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                 }
             ],
-            "time": "2020-11-30T07:25:11+00:00"
+            "time": "2021-06-15T12:49:02+00:00"
         },
         {
             "name": "sebastian/version",
-            "version": "2.0.1",
+            "version": "3.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/version.git",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+                "reference": "c6c1022351a901512170118436c764e473f6de8c"
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-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c6c1022351a901512170118436c764e473f6de8c",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.6"
+                "php": ">=7.3"
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             "extra": {
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-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "3.0-dev"
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@@ -2132,9 +2450,15 @@
             "homepage": "https://github.com/sebastianbergmann/version",
             "support": {
                 "issues": "https://github.com/sebastianbergmann/version/issues",
-                "source": "https://github.com/sebastianbergmann/version/tree/master"
+                "source": "https://github.com/sebastianbergmann/version/tree/3.0.2"
             },
-            "time": "2016-10-03T07:35:21+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T06:39:44+00:00"
         },
         {
             "name": "squizlabs/php_codesniffer",
@@ -2386,7 +2710,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^7.1"
+        "php": "^7.1 || ^8.0"
     },
     "platform-dev": [],
     "plugin-api-version": "2.0.0"
diff --git a/phpunit.xml b/phpunit.xml
index 4ac836f..dec8d29 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -19,9 +19,9 @@
     <listeners>
         <listener class="JohnKary\PHPUnit\Listener\SpeedTrapListener" />
     </listeners>
-    <filter>
-        <whitelist>
+    <coverage>
+        <include>
             <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
+        </include>
+    </coverage>
 </phpunit>