diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a7e6fa4..4a6f968 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,7 +15,7 @@ before_script:
       apt-get update -yqq && apt-get upgrade -yqq && apt-get install -yqq git libzip-dev unzip zip libpcre3-dev && docker-php-ext-install zip && pecl install xdebug && docker-php-ext-enable xdebug
     fi
   - > 
-    if [ "$CI_JOB_NAME" == "test:7.4" ] || [ "$CI_JOB_NAME" == "test:8.0" ]; then
+    if [ "$CI_JOB_NAME" == "test:8.1" ]; then
         pecl install ds && docker-php-ext-enable ds
     fi
   - >
@@ -23,36 +23,20 @@ before_script:
       curl -sS https://getcomposer.org/installer | php
       php composer.phar install
     fi
-test:7.4:
+test:8.1:
   only:
   - branches
   tags:
   - default
-  image: php:7.4
+  image: php:8.1
   script:
   - vendor/bin/phpunit --configuration phpunit.xml --coverage-text --colors=never
-test:7.4-without-ext-ds:
+test:8.1-without-ext-ds:
   only:
   - branches
   tags:
   - default
-  image: php:7.4
-  script:
-  - vendor/bin/phpunit --configuration phpunit.xml --coverage-text --colors=never
-test:8.0:
-  only:
-  - branches
-  tags:
-  - default
-  image: php:8.0
-  script:
-  - vendor/bin/phpunit --configuration phpunit.xml --coverage-text --colors=never
-test:8.0-without-ext-ds:
-  only:
-  - branches
-  tags:
-  - default
-  image: php:8.0
+  image: php:8.1
   script:
   - vendor/bin/phpunit --configuration phpunit.xml --coverage-text --colors=never
 stages:
diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
new file mode 100644
index 0000000..19e62e8
--- /dev/null
+++ b/.php-cs-fixer.php
@@ -0,0 +1,77 @@
+<?php declare(strict_types=1);
+
+/*
+ * Copyright (c) 2020  https://rewiv.com sikofitt@gmail.com
+ *
+ * This file is a part of Olive BBS
+ *
+ * This Source Code Form is subject to the
+ * terms of the Mozilla Public License, v. 2.0.
+ *
+ * If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ *         ___                   ___    ___
+ *        (   ).-.              (   )  (   )
+ *    .--. | |( __)___  ___ .--. | |.-. | |.-.     .--.
+ *   /    \| |(''"(   )(   /    \| /   \| /   \  /  _  \
+ *  |  .-. | | | | | |  | |  .-. |  .-. |  .-. |. .' `. ;
+ *  | |  | | | | | | |  | |  | | | |  | | |  | || '   | |
+ *  | |  | | | | | | |  | |  |/  | |  | | |  | |_\_`.(___)
+ *  | |  | | | | | | |  | |  ' _.| |  | | |  | (   ). '.
+ *  | '  | | | | | ' '  ; |  .'.-| '  | | '  | || |  `\ |
+ *  '  `-' | | | |  \ `' /'  `-' ' `-' ;' `-' ; ; '._,' '
+ *   `.__.(___(___)  '_.'  `.__.' `.__.  `.__.   '.___.'
+ *
+ */
+
+$header = '';
+
+if (file_exists(__DIR__.'/header.txt')) {
+    $header = file_get_contents('header.txt');
+}
+return (new \PhpCsFixer\Config())
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@PSR2' => true,
+        '@PHP80Migration' => true,
+        '@PHP80Migration:risky' => true,
+        '@PHP81Migration' => true,
+        'header_comment' => ['header' => $header],
+        'ordered_class_elements' => true,
+        'ordered_imports' => true,
+        'no_mixed_echo_print' => ['use' => 'print'],
+        'strict_param' => true,
+        'strict_comparison' => true,
+        'single_import_per_statement' => false,
+        'phpdoc_order' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'phpdoc_add_missing_param_annotation' => true,
+        'psr_autoloading' => true,
+        'phpdoc_var_without_name' => false,
+        'no_unused_imports' => true,
+        'no_useless_else' => true,
+        'no_useless_return' => true,
+        'no_extra_blank_lines' => [
+            'tokens' => [
+                'break',
+                'continue',
+                'extra',
+                'return',
+                'throw',
+                'parenthesis_brace_block',
+                'square_brace_block',
+                'curly_brace_block',
+            ],
+        ],
+    ])->setFinder(
+        (new \PhpCsFixer\Finder())
+            ->ignoreDotFiles(true)
+            ->ignoreVCS(true)
+            ->name('*.php')
+            ->in([
+                'src',
+                'tests',
+                __DIR__,
+            ])
+    );
diff --git a/.php_cs.dist b/.php_cs.dist
deleted file mode 100644
index 4bf445f..0000000
--- a/.php_cs.dist
+++ /dev/null
@@ -1,58 +0,0 @@
-<?php
-
-$header = '';
-
-if(file_exists(__DIR__.'/header.txt')) {
-    $header = file_get_contents('header.txt');
-}
-
-return PhpCsFixer\Config::create()
-  ->setRiskyAllowed(true)
-  ->setRules(
-    [
-      '@PSR2' => true,
-      '@PHP70Migration' => true,
-      '@PHP70Migration:risky' => true,
-      '@PHP71Migration' => true,
-      '@PHP71Migration:risky' => true,
-      '@PHP73Migration' => true,
-      '@PHP74Migration' => true,
-      '@PHP74Migration:risky' => true,
-      '@PHP80Migration' => true,
-      '@PHP80Migration:risky' => true,
-      'header_comment' => ['header' => $header],
-      'ordered_class_elements' => true,
-      'ordered_imports' => true,
-      'no_mixed_echo_print' => ['use' => 'print'],
-      'strict_param' => true,
-      'strict_comparison' => true,
-      'single_import_per_statement' => false,
-      'phpdoc_order' => true,
-      'array_syntax' => ['syntax' => 'short'],
-      'phpdoc_add_missing_param_annotation' => true,
-      'psr4' => true,
-      'phpdoc_var_without_name' => false,
- 	'no_unused_imports' => true,
-	'no_useless_else' => true,
-	'no_useless_return' => true,
-       'no_extra_consecutive_blank_lines' => [
-        'break',
-        'continue',
-        'extra',
-        'return',
-        'throw',
-        'parenthesis_brace_block',
-        'square_brace_block',
-        'curly_brace_block',
-      ],
-    ]
-  )->setFinder(
-    PhpCsFixer\Finder::create()
-      ->ignoreDotFiles(true)
-      ->ignoreVCS(true)
-      ->name('*.php')
-      ->in([
-        'src',
-	'tests',
-      ])
-  );
\ No newline at end of file
diff --git a/composer.json b/composer.json
index c9f5c2b..ba8f7ff 100644
--- a/composer.json
+++ b/composer.json
@@ -1,14 +1,13 @@
 {
-    "name": "olivebbs/map",
+    "name": "olive/map",
     "description": "Generic map for PHP",
     "type": "library",
     "require": {
-        "php": ">=7.4",
-        "php-ds/php-ds": "^1.3",
-        "symfony/polyfill-php80": "^1.22"
+        "php": ">=8.1",
+        "php-ds/php-ds": "^1.4"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^2.18",
+        "friendsofphp/php-cs-fixer": "^3.8",
         "phpunit/phpunit": "^9.5"
     },
     "license": "MPL-2.0",
@@ -19,7 +18,7 @@
         }
     ],
     "suggest": {
-         "ext-ds": "ext-ds"   
+         "ext-ds": "To use the Data structure extension instead of polyfill."
     },
   "autoload": {
     "psr-4": {
diff --git a/composer.lock b/composer.lock
index 82b993a..d699f75 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": "a566fdaf6ff9f571687f26e3dc7a8a62",
+    "content-hash": "7280268dab0ec0a2dcc7cd9f97171217",
     "packages": [
         {
             "name": "php-ds/php-ds",
@@ -60,118 +60,35 @@
                 "source": "https://github.com/php-ds/polyfill/tree/v1.4.1"
             },
             "time": "2022-03-09T20:39:30+00:00"
-        },
-        {
-            "name": "symfony/polyfill-php80",
-            "version": "v1.25.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-php80.git",
-                "reference": "4407588e0d3f1f52efb65fbe92babe41f37fe50c"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/4407588e0d3f1f52efb65fbe92babe41f37fe50c",
-                "reference": "4407588e0d3f1f52efb65fbe92babe41f37fe50c",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.1"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-main": "1.23-dev"
-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "files": [
-                    "bootstrap.php"
-                ],
-                "psr-4": {
-                    "Symfony\\Polyfill\\Php80\\": ""
-                },
-                "classmap": [
-                    "Resources/stubs"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Ion Bazan",
-                    "email": "ion.bazan@gmail.com"
-                },
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "support": {
-                "source": "https://github.com/symfony/polyfill-php80/tree/v1.25.0"
-            },
-            "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": "2022-03-04T08:16:47+00:00"
         }
     ],
     "packages-dev": [
         {
             "name": "composer/pcre",
-            "version": "1.0.1",
+            "version": "3.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/pcre.git",
-                "reference": "67a32d7d6f9f560b726ab25a061b38ff3a80c560"
+                "reference": "e300eb6c535192decd27a85bc72a9290f0d6b3bd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/pcre/zipball/67a32d7d6f9f560b726ab25a061b38ff3a80c560",
-                "reference": "67a32d7d6f9f560b726ab25a061b38ff3a80c560",
+                "url": "https://api.github.com/repos/composer/pcre/zipball/e300eb6c535192decd27a85bc72a9290f0d6b3bd",
+                "reference": "e300eb6c535192decd27a85bc72a9290f0d6b3bd",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.2 || ^7.0 || ^8.0"
+                "php": "^7.4 || ^8.0"
             },
             "require-dev": {
                 "phpstan/phpstan": "^1.3",
                 "phpstan/phpstan-strict-rules": "^1.1",
-                "symfony/phpunit-bridge": "^4.2 || ^5"
+                "symfony/phpunit-bridge": "^5"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "1.x-dev"
+                    "dev-main": "3.x-dev"
                 }
             },
             "autoload": {
@@ -199,7 +116,7 @@
             ],
             "support": {
                 "issues": "https://github.com/composer/pcre/issues",
-                "source": "https://github.com/composer/pcre/tree/1.0.1"
+                "source": "https://github.com/composer/pcre/tree/3.0.0"
             },
             "funding": [
                 {
@@ -215,7 +132,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-01-21T20:24:37+00:00"
+            "time": "2022-02-25T20:21:48+00:00"
         },
         {
             "name": "composer/semver",
@@ -300,27 +217,27 @@
         },
         {
             "name": "composer/xdebug-handler",
-            "version": "2.0.5",
+            "version": "3.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/xdebug-handler.git",
-                "reference": "9e36aeed4616366d2b690bdce11f71e9178c579a"
+                "reference": "ced299686f41dce890debac69273b47ffe98a40c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/9e36aeed4616366d2b690bdce11f71e9178c579a",
-                "reference": "9e36aeed4616366d2b690bdce11f71e9178c579a",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/ced299686f41dce890debac69273b47ffe98a40c",
+                "reference": "ced299686f41dce890debac69273b47ffe98a40c",
                 "shasum": ""
             },
             "require": {
-                "composer/pcre": "^1",
-                "php": "^5.3.2 || ^7.0 || ^8.0",
+                "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",
-                "symfony/phpunit-bridge": "^4.2 || ^5.0 || ^6.0"
+                "symfony/phpunit-bridge": "^6.0"
             },
             "type": "library",
             "autoload": {
@@ -346,7 +263,7 @@
             "support": {
                 "irc": "irc://irc.freenode.org/composer",
                 "issues": "https://github.com/composer/xdebug-handler/issues",
-                "source": "https://github.com/composer/xdebug-handler/tree/2.0.5"
+                "source": "https://github.com/composer/xdebug-handler/tree/3.0.3"
             },
             "funding": [
                 {
@@ -362,7 +279,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-02-24T20:20:32+00:00"
+            "time": "2022-02-25T21:32:43+00:00"
         },
         {
             "name": "doctrine/annotations",
@@ -584,85 +501,65 @@
         },
         {
             "name": "friendsofphp/php-cs-fixer",
-            "version": "v2.19.3",
+            "version": "v3.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/FriendsOfPHP/PHP-CS-Fixer.git",
-                "reference": "75ac86f33fab4714ea5a39a396784d83ae3b5ed8"
+                "reference": "cbad1115aac4b5c3c5540e7210d3c9fba2f81fa3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/75ac86f33fab4714ea5a39a396784d83ae3b5ed8",
-                "reference": "75ac86f33fab4714ea5a39a396784d83ae3b5ed8",
+                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/cbad1115aac4b5c3c5540e7210d3c9fba2f81fa3",
+                "reference": "cbad1115aac4b5c3c5540e7210d3c9fba2f81fa3",
                 "shasum": ""
             },
             "require": {
-                "composer/semver": "^1.4 || ^2.0 || ^3.0",
-                "composer/xdebug-handler": "^1.2 || ^2.0",
-                "doctrine/annotations": "^1.2",
+                "composer/semver": "^3.2",
+                "composer/xdebug-handler": "^3.0.3",
+                "doctrine/annotations": "^1.13",
                 "ext-json": "*",
                 "ext-tokenizer": "*",
-                "php": "^5.6 || ^7.0 || ^8.0",
-                "php-cs-fixer/diff": "^1.3",
-                "symfony/console": "^3.4.43 || ^4.1.6 || ^5.0",
-                "symfony/event-dispatcher": "^3.0 || ^4.0 || ^5.0",
-                "symfony/filesystem": "^3.0 || ^4.0 || ^5.0",
-                "symfony/finder": "^3.0 || ^4.0 || ^5.0",
-                "symfony/options-resolver": "^3.0 || ^4.0 || ^5.0",
-                "symfony/polyfill-php70": "^1.0",
-                "symfony/polyfill-php72": "^1.4",
-                "symfony/process": "^3.0 || ^4.0 || ^5.0",
-                "symfony/stopwatch": "^3.0 || ^4.0 || ^5.0"
+                "php": "^7.4 || ^8.0",
+                "php-cs-fixer/diff": "^2.0",
+                "symfony/console": "^5.4 || ^6.0",
+                "symfony/event-dispatcher": "^5.4 || ^6.0",
+                "symfony/filesystem": "^5.4 || ^6.0",
+                "symfony/finder": "^5.4 || ^6.0",
+                "symfony/options-resolver": "^5.4 || ^6.0",
+                "symfony/polyfill-mbstring": "^1.23",
+                "symfony/polyfill-php80": "^1.25",
+                "symfony/polyfill-php81": "^1.25",
+                "symfony/process": "^5.4 || ^6.0",
+                "symfony/stopwatch": "^5.4 || ^6.0"
             },
             "require-dev": {
-                "justinrainbow/json-schema": "^5.0",
-                "keradus/cli-executor": "^1.4",
-                "mikey179/vfsstream": "^1.6",
-                "php-coveralls/php-coveralls": "^2.4.2",
-                "php-cs-fixer/accessible-object": "^1.0",
+                "justinrainbow/json-schema": "^5.2",
+                "keradus/cli-executor": "^1.5",
+                "mikey179/vfsstream": "^1.6.10",
+                "php-coveralls/php-coveralls": "^2.5.2",
+                "php-cs-fixer/accessible-object": "^1.1",
                 "php-cs-fixer/phpunit-constraint-isidenticalstring": "^1.2",
                 "php-cs-fixer/phpunit-constraint-xmlmatchesxsd": "^1.2.1",
-                "phpspec/prophecy-phpunit": "^1.1 || ^2.0",
-                "phpunit/phpunit": "^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.13 || ^9.5",
+                "phpspec/prophecy": "^1.15",
+                "phpspec/prophecy-phpunit": "^2.0",
+                "phpunit/phpunit": "^9.5",
                 "phpunitgoodpractices/polyfill": "^1.5",
                 "phpunitgoodpractices/traits": "^1.9.1",
-                "sanmai/phpunit-legacy-adapter": "^6.4 || ^8.2.1",
-                "symfony/phpunit-bridge": "^5.2.1",
-                "symfony/yaml": "^3.0 || ^4.0 || ^5.0"
+                "symfony/phpunit-bridge": "^6.0",
+                "symfony/yaml": "^5.4 || ^6.0"
             },
             "suggest": {
                 "ext-dom": "For handling output formats in XML",
-                "ext-mbstring": "For handling non-UTF8 characters.",
-                "php-cs-fixer/phpunit-constraint-isidenticalstring": "For IsIdenticalString constraint.",
-                "php-cs-fixer/phpunit-constraint-xmlmatchesxsd": "For XmlMatchesXsd constraint.",
-                "symfony/polyfill-mbstring": "When enabling `ext-mbstring` is not possible."
+                "ext-mbstring": "For handling non-UTF8 characters."
             },
             "bin": [
                 "php-cs-fixer"
             ],
             "type": "application",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.19-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "PhpCsFixer\\": "src/"
-                },
-                "classmap": [
-                    "tests/Test/AbstractFixerTestCase.php",
-                    "tests/Test/AbstractIntegrationCaseFactory.php",
-                    "tests/Test/AbstractIntegrationTestCase.php",
-                    "tests/Test/Assert/AssertTokensTrait.php",
-                    "tests/Test/IntegrationCase.php",
-                    "tests/Test/IntegrationCaseFactory.php",
-                    "tests/Test/IntegrationCaseFactoryInterface.php",
-                    "tests/Test/InternalIntegrationCaseFactory.php",
-                    "tests/Test/IsIdenticalConstraint.php",
-                    "tests/Test/TokensWithObservedTransformers.php",
-                    "tests/TestCase.php"
-                ]
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -681,7 +578,7 @@
             "description": "A tool to automatically fix PHP code style",
             "support": {
                 "issues": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/issues",
-                "source": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/tree/v2.19.3"
+                "source": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/tree/v3.8.0"
             },
             "funding": [
                 {
@@ -689,7 +586,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-11-15T17:17:55+00:00"
+            "time": "2022-03-18T17:20:59+00:00"
         },
         {
             "name": "myclabs/deep-copy",
@@ -919,16 +816,16 @@
         },
         {
             "name": "php-cs-fixer/diff",
-            "version": "v1.3.1",
+            "version": "v2.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHP-CS-Fixer/diff.git",
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-                "url": "https://api.github.com/repos/symfony/options-resolver/zipball/cc1147cb11af1b43f503ac18f31aa3bec213aba8",
-                "reference": "cc1147cb11af1b43f503ac18f31aa3bec213aba8",
+                "url": "https://api.github.com/repos/symfony/options-resolver/zipball/51f7006670febe4cbcbae177cbffe93ff833250d",
+                "reference": "51f7006670febe4cbcbae177cbffe93ff833250d",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
-                "symfony/deprecation-contracts": "^2.1|^3",
-                "symfony/polyfill-php73": "~1.0",
-                "symfony/polyfill-php80": "^1.16"
+                "php": ">=8.0.2",
+                "symfony/deprecation-contracts": "^2.1|^3"
             },
             "type": "library",
             "autoload": {
@@ -3289,7 +3177,7 @@
                 "options"
             ],
             "support": {
-                "source": "https://github.com/symfony/options-resolver/tree/v5.4.3"
+                "source": "https://github.com/symfony/options-resolver/tree/v6.0.3"
             },
             "funding": [
                 {
@@ -3305,7 +3193,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-01-02T09:53:40+00:00"
+            "time": "2022-01-02T09:55:41+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
@@ -3638,85 +3526,17 @@
             "time": "2021-11-30T18:21:41+00:00"
         },
         {
-            "name": "symfony/polyfill-php70",
-            "version": "v1.20.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-php70.git",
-                "reference": "5f03a781d984aae42cebd18e7912fa80f02ee644"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php70/zipball/5f03a781d984aae42cebd18e7912fa80f02ee644",
-                "reference": "5f03a781d984aae42cebd18e7912fa80f02ee644",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.1"
-            },
-            "type": "metapackage",
-            "extra": {
-                "branch-alias": {
-                    "dev-main": "1.20-dev"
-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
-                }
-            },
-            "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 backporting some PHP 7.0+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "support": {
-                "source": "https://github.com/symfony/polyfill-php70/tree/v1.20.0"
-            },
-            "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": "2020-10-23T14:02:19+00:00"
-        },
-        {
-            "name": "symfony/polyfill-php72",
+            "name": "symfony/polyfill-php80",
             "version": "v1.25.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/polyfill-php72.git",
-                "reference": "9a142215a36a3888e30d0a9eeea9766764e96976"
+                "url": "https://github.com/symfony/polyfill-php80.git",
+                "reference": "4407588e0d3f1f52efb65fbe92babe41f37fe50c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/9a142215a36a3888e30d0a9eeea9766764e96976",
-                "reference": "9a142215a36a3888e30d0a9eeea9766764e96976",
+                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/4407588e0d3f1f52efb65fbe92babe41f37fe50c",
+                "reference": "4407588e0d3f1f52efb65fbe92babe41f37fe50c",
                 "shasum": ""
             },
             "require": {
@@ -3737,14 +3557,21 @@
                     "bootstrap.php"
                 ],
                 "psr-4": {
-                    "Symfony\\Polyfill\\Php72\\": ""
-                }
+                    "Symfony\\Polyfill\\Php80\\": ""
+                },
+                "classmap": [
+                    "Resources/stubs"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "MIT"
             ],
             "authors": [
+                {
+                    "name": "Ion Bazan",
+                    "email": "ion.bazan@gmail.com"
+                },
                 {
                     "name": "Nicolas Grekas",
                     "email": "p@tchwork.com"
@@ -3754,7 +3581,7 @@
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions",
+            "description": "Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions",
             "homepage": "https://symfony.com",
             "keywords": [
                 "compatibility",
@@ -3763,7 +3590,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-php72/tree/v1.25.0"
+                "source": "https://github.com/symfony/polyfill-php80/tree/v1.25.0"
             },
             "funding": [
                 {
@@ -3779,20 +3606,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-27T09:17:38+00:00"
+            "time": "2022-03-04T08:16:47+00:00"
         },
         {
-            "name": "symfony/polyfill-php73",
+            "name": "symfony/polyfill-php81",
             "version": "v1.25.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/polyfill-php73.git",
-                "reference": "cc5db0e22b3cb4111010e48785a97f670b350ca5"
+                "url": "https://github.com/symfony/polyfill-php81.git",
+                "reference": "5de4ba2d41b15f9bd0e19b2ab9674135813ec98f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/cc5db0e22b3cb4111010e48785a97f670b350ca5",
-                "reference": "cc5db0e22b3cb4111010e48785a97f670b350ca5",
+                "url": "https://api.github.com/repos/symfony/polyfill-php81/zipball/5de4ba2d41b15f9bd0e19b2ab9674135813ec98f",
+                "reference": "5de4ba2d41b15f9bd0e19b2ab9674135813ec98f",
                 "shasum": ""
             },
             "require": {
@@ -3813,7 +3640,7 @@
                     "bootstrap.php"
                 ],
                 "psr-4": {
-                    "Symfony\\Polyfill\\Php73\\": ""
+                    "Symfony\\Polyfill\\Php81\\": ""
                 },
                 "classmap": [
                     "Resources/stubs"
@@ -3833,7 +3660,7 @@
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony polyfill backporting some PHP 7.3+ features to lower PHP versions",
+            "description": "Symfony polyfill backporting some PHP 8.1+ features to lower PHP versions",
             "homepage": "https://symfony.com",
             "keywords": [
                 "compatibility",
@@ -3842,7 +3669,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-php73/tree/v1.25.0"
+                "source": "https://github.com/symfony/polyfill-php81/tree/v1.25.0"
             },
             "funding": [
                 {
@@ -3858,25 +3685,24 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-06-05T21:20:04+00:00"
+            "time": "2021-09-13T13:58:11+00:00"
         },
         {
             "name": "symfony/process",
-            "version": "v5.4.8",
+            "version": "v6.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "597f3fff8e3e91836bb0bd38f5718b56ddbde2f3"
+                "reference": "d074154ea8b1443a96391f6e39f9e547b2dd01b9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/597f3fff8e3e91836bb0bd38f5718b56ddbde2f3",
-                "reference": "597f3fff8e3e91836bb0bd38f5718b56ddbde2f3",
+                "url": "https://api.github.com/repos/symfony/process/zipball/d074154ea8b1443a96391f6e39f9e547b2dd01b9",
+                "reference": "d074154ea8b1443a96391f6e39f9e547b2dd01b9",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
-                "symfony/polyfill-php80": "^1.16"
+                "php": ">=8.0.2"
             },
             "type": "library",
             "autoload": {
@@ -3904,7 +3730,7 @@
             "description": "Executes commands in sub-processes",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/process/tree/v5.4.8"
+                "source": "https://github.com/symfony/process/tree/v6.0.8"
             },
             "funding": [
                 {
@@ -3920,26 +3746,25 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-04-08T05:07:18+00:00"
+            "time": "2022-04-12T16:11:42+00:00"
         },
         {
             "name": "symfony/service-contracts",
-            "version": "v2.5.1",
+            "version": "v3.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/service-contracts.git",
-                "reference": "24d9dc654b83e91aa59f9d167b131bc3b5bea24c"
+                "reference": "e517458f278c2131ca9f262f8fbaf01410f2c65c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/24d9dc654b83e91aa59f9d167b131bc3b5bea24c",
-                "reference": "24d9dc654b83e91aa59f9d167b131bc3b5bea24c",
+                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/e517458f278c2131ca9f262f8fbaf01410f2c65c",
+                "reference": "e517458f278c2131ca9f262f8fbaf01410f2c65c",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
-                "psr/container": "^1.1",
-                "symfony/deprecation-contracts": "^2.1|^3"
+                "php": ">=8.0.2",
+                "psr/container": "^2.0"
             },
             "conflict": {
                 "ext-psr": "<1.1|>=2"
@@ -3950,7 +3775,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "2.5-dev"
+                    "dev-main": "3.0-dev"
                 },
                 "thanks": {
                     "name": "symfony/contracts",
@@ -3987,7 +3812,7 @@
                 "standards"
             ],
             "support": {
-                "source": "https://github.com/symfony/service-contracts/tree/v2.5.1"
+                "source": "https://github.com/symfony/service-contracts/tree/v3.0.1"
             },
             "funding": [
                 {
@@ -4003,24 +3828,24 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-03-13T20:07:29+00:00"
+            "time": "2022-03-13T20:10:05+00:00"
         },
         {
             "name": "symfony/stopwatch",
-            "version": "v5.4.5",
+            "version": "v6.0.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "4d04b5c24f3c9a1a168a131f6cbe297155bc0d30"
+                "reference": "f2c1780607ec6502f2121d9729fd8150a655d337"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/4d04b5c24f3c9a1a168a131f6cbe297155bc0d30",
-                "reference": "4d04b5c24f3c9a1a168a131f6cbe297155bc0d30",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/f2c1780607ec6502f2121d9729fd8150a655d337",
+                "reference": "f2c1780607ec6502f2121d9729fd8150a655d337",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
+                "php": ">=8.0.2",
                 "symfony/service-contracts": "^1|^2|^3"
             },
             "type": "library",
@@ -4049,7 +3874,7 @@
             "description": "Provides a way to profile code",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/stopwatch/tree/v5.4.5"
+                "source": "https://github.com/symfony/stopwatch/tree/v6.0.5"
             },
             "funding": [
                 {
@@ -4065,38 +3890,37 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-02-18T16:06:09+00:00"
+            "time": "2022-02-21T17:15:17+00:00"
         },
         {
             "name": "symfony/string",
-            "version": "v5.4.8",
+            "version": "v6.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/string.git",
-                "reference": "3c061a76bff6d6ea427d85e12ad1bb8ed8cd43e8"
+                "reference": "ac0aa5c2282e0de624c175b68d13f2c8f2e2649d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/string/zipball/3c061a76bff6d6ea427d85e12ad1bb8ed8cd43e8",
-                "reference": "3c061a76bff6d6ea427d85e12ad1bb8ed8cd43e8",
+                "url": "https://api.github.com/repos/symfony/string/zipball/ac0aa5c2282e0de624c175b68d13f2c8f2e2649d",
+                "reference": "ac0aa5c2282e0de624c175b68d13f2c8f2e2649d",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
+                "php": ">=8.0.2",
                 "symfony/polyfill-ctype": "~1.8",
                 "symfony/polyfill-intl-grapheme": "~1.0",
                 "symfony/polyfill-intl-normalizer": "~1.0",
-                "symfony/polyfill-mbstring": "~1.0",
-                "symfony/polyfill-php80": "~1.15"
+                "symfony/polyfill-mbstring": "~1.0"
             },
             "conflict": {
-                "symfony/translation-contracts": ">=3.0"
+                "symfony/translation-contracts": "<2.0"
             },
             "require-dev": {
-                "symfony/error-handler": "^4.4|^5.0|^6.0",
-                "symfony/http-client": "^4.4|^5.0|^6.0",
-                "symfony/translation-contracts": "^1.1|^2",
-                "symfony/var-exporter": "^4.4|^5.0|^6.0"
+                "symfony/error-handler": "^5.4|^6.0",
+                "symfony/http-client": "^5.4|^6.0",
+                "symfony/translation-contracts": "^2.0|^3.0",
+                "symfony/var-exporter": "^5.4|^6.0"
             },
             "type": "library",
             "autoload": {
@@ -4135,7 +3959,7 @@
                 "utf8"
             ],
             "support": {
-                "source": "https://github.com/symfony/string/tree/v5.4.8"
+                "source": "https://github.com/symfony/string/tree/v6.0.8"
             },
             "funding": [
                 {
@@ -4151,7 +3975,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-04-19T10:40:37+00:00"
+            "time": "2022-04-22T08:18:02+00:00"
         },
         {
             "name": "theseer/tokenizer",
@@ -4268,7 +4092,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.4"
+        "php": ">=8.1"
     },
     "platform-dev": [],
     "plugin-api-version": "2.3.0"
diff --git a/src/Olivebbs/Map/CharMap.php b/src/Olivebbs/Map/CharMap.php
index 5ddbb39..a6f961c 100644
--- a/src/Olivebbs/Map/CharMap.php
+++ b/src/Olivebbs/Map/CharMap.php
@@ -34,14 +34,15 @@ class CharMap extends GenericMap
 {
     public function __construct(array $initialValues = [])
     {
-        parent::__construct(self::CHAR, self::CHAR);
+        parent::__construct(keyType: self::CHAR, valueType: self::CHAR);
 
-        $this->map->putAll($initialValues);
+        $this->map->putAll(values: $initialValues);
     }
 
-    public static function fromString(string $string): CharMap
+    public static function fromString(string $string): static
     {
-        $values = str_split($string);
-        return new self(array_combine($values, $values));
+        $values = str_split(string: $string);
+
+        return new static(initialValues: array_combine(keys: $values, values: $values));
     }
 }
diff --git a/src/Olivebbs/Map/GenericMap.php b/src/Olivebbs/Map/GenericMap.php
index a438344..a33a257 100644
--- a/src/Olivebbs/Map/GenericMap.php
+++ b/src/Olivebbs/Map/GenericMap.php
@@ -28,15 +28,19 @@
 namespace Olivebbs\Map;
 
 use ArrayAccess;
+use function class_exists;
 use Countable;
 use Ds\Map;
+use function enum_exists;
+use function in_array;
 use function is_array;
 use function is_callable;
 use function is_int;
 use function is_object;
 use function is_string;
+use function mb_strlen;
 use Olivebbs\Map\Exception\InvalidArgumentException;
-
+use function sprintf;
 use function strtolower;
 use TypeError;
 use ValueError;
@@ -50,24 +54,23 @@ class GenericMap implements ArrayAccess, Countable
     public const INTEGER = 'integer';
     public const STRING = 'string';
     public const CHAR = 'char';
+    public const ENUM = 'enum';
     public const ANY = 'any';
 
     protected Map $map;
-    protected string $keyType;
-    protected string $valueType;
 
-    public function __construct(string $keyType = self::ANY, string $valueType = self::ANY)
+    public function __construct(protected string $keyType = self::ANY, protected string $valueType = self::ANY)
     {
-        $this->keyType = strtolower($keyType);
+        $this->keyType = strtolower(string: $keyType);
 
-        $this->valueType = class_exists($valueType) ? $valueType : strtolower($valueType);
+        $this->valueType = class_exists(class: $valueType) ? $valueType : strtolower(string: $valueType);
 
-        if (!$this->isValidKeyType($this->keyType)) {
-            throw new InvalidArgumentException(sprintf('Invalid key type (%s)', $this->keyType));
+        if (!$this->isValidKeyType(type: $this->keyType)) {
+            throw new InvalidArgumentException(message: sprintf('Invalid key type (%s)', $this->keyType));
         }
 
-        if (!$this->isValidValueType($this->valueType)) {
-            throw new InvalidArgumentException(sprintf('Invalid value type (%s)', $this->valueType));
+        if (!$this->isValidValueType(type: $this->valueType)) {
+            throw new InvalidArgumentException(message: sprintf('Invalid value type (%s)', $this->valueType));
         }
 
         $this->map = new Map();
@@ -86,71 +89,45 @@ class GenericMap implements ArrayAccess, Countable
     /**
      * @inheritDoc
      */
-    public function offsetExists($offset): bool
+    public function offsetExists(mixed $offset): bool
     {
-        if (is_array($offset) || is_object($offset)) {
-            throw new InvalidArgumentException('Map keys cannot be objects or arrays');
-        }
+        $this->checkTypes(offset: $offset);
 
-        if (!$this->checkType($this->keyType, $offset)) {
-            throw new TypeError(sprintf('Key should be of value %s.', $this->keyType));
-        }
-
-        return $this->map->offsetExists($offset);
+        return $this->map->offsetExists(offset: $offset);
     }
 
     /**
      * @inheritDoc
      */
-    public function offsetGet($offset)
+    public function offsetGet(mixed $offset): mixed
     {
-        if (is_array($offset) || is_object($offset)) {
-            throw new InvalidArgumentException('Map keys cannot be objects or arrays');
-        }
+        $this->checkTypes(offset: $offset);
 
-        if (!$this->checkType($this->keyType, $offset)) {
-            throw new TypeError(sprintf('Key should be of value %s.', $this->keyType));
-        }
-        if (!$this->map->offsetExists($offset)) {
+        if (!$this->map->offsetExists(offset: $offset)) {
             return null;
         }
-        return $this->map->offsetGet($offset);
+
+        return $this->map->offsetGet(offset: $offset);
     }
 
     /**
      * @inheritDoc
      */
-    public function offsetSet($offset, $value): void
+    public function offsetSet(mixed $offset, mixed $value): void
     {
-        if (is_array($offset) || is_object($offset)) {
-            throw new InvalidArgumentException('Map keys cannot be objects or arrays');
-        }
+        $this->checkTypes($offset, $value);
 
-        if (!$this->checkType($this->keyType, $offset)) {
-            throw new TypeError(sprintf('Key should be of value %s.', $this->keyType));
-        }
-
-        if (!$this->checkType($this->valueType, $value)) {
-            throw new ValueError(sprintf('Value should be of type %s.', $this->valueType));
-        }
-
-        $this->map->offsetSet($offset, $value);
+        $this->map->offsetSet(offset: $offset, value: $value);
     }
 
     /**
      * @inheritDoc
      */
-    public function offsetUnset($offset): void
+    public function offsetUnset(mixed $offset): void
     {
-        if (is_array($offset) || is_object($offset)) {
-            throw new InvalidArgumentException('Map keys cannot be objects or arrays');
-        }
+        $this->checkTypes(offset: $offset);
 
-        if (!$this->checkType($this->keyType, $offset)) {
-            throw new TypeError(sprintf('Key should be of value %s.', $this->keyType));
-        }
-
-        $this->map->offsetUnset($offset);
+        $this->map->offsetUnset(offset: $offset);
     }
 
     /**
@@ -175,61 +152,69 @@ class GenericMap implements ArrayAccess, Countable
     protected function assertInitialValues(array $initialValues): bool
     {
         foreach ($initialValues as $key => $value) {
-            if (!$this->checkType($this->keyType, $key) || !$this->checkType($this->valueType, $value)) {
-                throw new InvalidArgumentException(sprintf('Invalid types for map [%s => %s], they should be [%s => %s]', get_debug_type($key), get_debug_type($value), $this->keyType, $this->valueType));
+            if (!$this->checkType(type: $this->keyType, var: $key) || !$this->checkType(type: $this->valueType, var: $value)) {
+                throw new InvalidArgumentException(message: sprintf('Invalid types for map [%s => %s], they should be [%s => %s]', get_debug_type(value: $key), get_debug_type(value: $value), $this->keyType, $this->valueType));
             }
         }
         
         return true;
     }
 
+    private function checkTypes(mixed $offset, mixed $value = null): void
+    {
+        if (is_array(value: $offset) || is_object(value: $offset)) {
+            throw new InvalidArgumentException(message: 'Map keys cannot be objects or arrays');
+        }
+
+        if (!$this->checkType(type: $this->keyType, var: $offset)) {
+            throw new TypeError(message: sprintf('Key should be of value %s.', $this->keyType));
+        }
+
+        if (null !== $value && !$this->checkType(type: $this->valueType, var: $value)) {
+            throw new ValueError(message: sprintf('Value should be of type %s.', $this->valueType));
+        }
+    }
+
     /**
      * @codeCoverageIgnore
      * @param string $type
-     * @param        $var
+     * @param mixed  $var
      *
      * @return bool
      */
-    private function checkType(string $type, $var): bool
+    private function checkType(string $type, mixed $var): bool
     {
-        switch ($type) {
-            case self::OBJECT:
-                return is_object($var);
-            case self::CALLABLE:
-                return is_callable($var);
-            case self::ARRAY:
-                return is_array($var);
-            case self::INT:
-            case self::INTEGER:
-                return is_int($var);
-            case self::STRING:
-                return is_string($var);
-            case self::CHAR:
-                return is_string($var) && \mb_strlen($var) === 1;
-            case self::ANY:
-                return true;
-            default:
-                return $var instanceof $type;
-        }
+        return match ($type) {
+            self::OBJECT => is_object(value: $var),
+            self::CALLABLE => is_callable(value: $var),
+            self::ARRAY => is_array(value: $var),
+            self::INT, self::INTEGER => is_int(value: $var),
+            self::STRING => is_string(value: $var),
+            self::CHAR => is_string(value: $var) && (function_exists('mb_strlen') ? mb_strlen(string: $var) === 1 : strlen(string: $var) === 1),
+            self::ENUM => is_object(value: $var) && enum_exists(enum: $var::class),
+            self::ANY => true,
+            default => $var instanceof $type,
+        };
     }
+
     private function isValidKeyType(string $type): bool
     {
-        return in_array($type, [
+        return in_array(needle: $type, haystack: [
             self::INT,
             self::INTEGER,
             self::STRING,
             self::CHAR,
             self::ANY,
-        ], true);
+        ], strict: true);
     }
 
     private function isValidValueType(string $type): bool
     {
-        if (class_exists($type)) {
+        if (class_exists(class: $type)) {
             return true;
         }
 
-        return in_array($type, [
+        return in_array(needle: $type, haystack: [
           self::OBJECT,
           self::CALLABLE,
           self::ARRAY,
@@ -237,7 +222,8 @@ class GenericMap implements ArrayAccess, Countable
           self::INTEGER,
           self::STRING,
           self::CHAR,
+          self::ENUM,
           self::ANY,
-        ], true);
+        ], strict: true);
     }
 }
diff --git a/src/Olivebbs/Map/ImmutableMap.php b/src/Olivebbs/Map/ImmutableMap.php
index 0920980..9e5aebd 100644
--- a/src/Olivebbs/Map/ImmutableMap.php
+++ b/src/Olivebbs/Map/ImmutableMap.php
@@ -32,28 +32,28 @@ use Olivebbs\Map\Exception\ImmutableMapException;
 class ImmutableMap extends GenericMap
 {
     private function __construct(
-      ?string $keyType,
-      ?string $valueType,
-      array $values
+        string $keyType,
+        string $valueType,
+        array $values
     ) {
-        parent::__construct($keyType, $valueType);
+        parent::__construct(keyType: $keyType, valueType: $valueType);
 
-        $this->assertInitialValues($values);
-        $this->map->putAll($values);
+        $this->assertInitialValues(initialValues: $values);
+        $this->map->putAll(values: $values);
     }
 
-    public function offsetSet($offset, $value): void
+    public function offsetSet(mixed $offset, mixed $value): void
     {
-        throw new ImmutableMapException(sprintf('Cannot change values in %s', __CLASS__));
+        throw new ImmutableMapException(message: sprintf('Cannot change values in %s', __CLASS__));
     }
 
-    public function offsetUnset($offset): void
+    public function offsetUnset(mixed $offset): void
     {
-        throw new ImmutableMapException(sprintf('Cannot unset values in %s', __CLASS__));
+        throw new ImmutableMapException(message: sprintf('Cannot unset values in %s', __CLASS__));
     }
 
-    public static function create(string $keyType, string $valueType, array $values): ImmutableMap
+    public static function create(string $keyType, string $valueType, array $values): static
     {
-        return new self($keyType, $valueType, $values);
+        return new static(keyType: $keyType, valueType: $valueType, values: $values);
     }
 }
diff --git a/src/Olivebbs/Map/IntCharMap.php b/src/Olivebbs/Map/IntCharMap.php
index f78cdc4..86bcb18 100644
--- a/src/Olivebbs/Map/IntCharMap.php
+++ b/src/Olivebbs/Map/IntCharMap.php
@@ -33,14 +33,14 @@ class IntCharMap extends GenericMap
 {
     public function __construct(array $initialValues = [])
     {
-        parent::__construct(self::INT, self::CHAR);
+        parent::__construct(keyType: self::INT, valueType: self::CHAR);
 
-        $this->map->putAll($initialValues);
+        $this->map->putAll(values: $initialValues);
     }
 
-    public static function fromString(string $string): IntCharMap
+    public static function fromString(string $string): static
     {
-        $values = str_split($string);
-        return new self($values);
+        $values = str_split(string: $string);
+        return new static(initialValues: $values);
     }
 }
diff --git a/tests/GenericMapTest.php b/tests/GenericMapTest.php
index 77379e6..99e6768 100644
--- a/tests/GenericMapTest.php
+++ b/tests/GenericMapTest.php
@@ -167,6 +167,22 @@ class GenericMapTest extends TestCase
         $genericMap[$object] = 1;
     }
 
+    public function testEnumMap(): void
+    {
+        $enumMap = new class(TestEnum::cases()) extends GenericMap {
+            public function __construct(array $values = [])
+            {
+                parent::__construct(self::INT, self::ENUM);
+                $this->assertInitialValues($values);
+                $this->map->putAll($values);
+            }
+        };
+
+        self::assertCount(8, $enumMap->toArray());
+        self::assertSame(TestEnum::a, $enumMap[0]);
+        self::assertSame(TestEnum::h, $enumMap[7]);
+    }
+
     private function resetGenericMap(): void
     {
         $this->genericMap = $this->getGenericMap();
diff --git a/tests/TestEnum.php b/tests/TestEnum.php
new file mode 100644
index 0000000..d05d16f
--- /dev/null
+++ b/tests/TestEnum.php
@@ -0,0 +1,40 @@
+<?php declare(strict_types=1);
+
+/*
+ * Copyright (c) 2020  https://rewiv.com sikofitt@gmail.com
+ *
+ * This file is a part of Olive BBS
+ *
+ * This Source Code Form is subject to the
+ * terms of the Mozilla Public License, v. 2.0.
+ *
+ * If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ *         ___                   ___    ___
+ *        (   ).-.              (   )  (   )
+ *    .--. | |( __)___  ___ .--. | |.-. | |.-.     .--.
+ *   /    \| |(''"(   )(   /    \| /   \| /   \  /  _  \
+ *  |  .-. | | | | | |  | |  .-. |  .-. |  .-. |. .' `. ;
+ *  | |  | | | | | | |  | |  | | | |  | | |  | || '   | |
+ *  | |  | | | | | | |  | |  |/  | |  | | |  | |_\_`.(___)
+ *  | |  | | | | | | |  | |  ' _.| |  | | |  | (   ). '.
+ *  | '  | | | | | ' '  ; |  .'.-| '  | | '  | || |  `\ |
+ *  '  `-' | | | |  \ `' /'  `-' ' `-' ;' `-' ; ; '._,' '
+ *   `.__.(___(___)  '_.'  `.__.' `.__.  `.__.   '.___.'
+ *
+ */
+
+namespace Olivebbs\Tests\Map;
+
+enum TestEnum
+{
+    case a;
+    case b;
+    case c;
+    case d;
+    case e;
+    case f;
+    case g;
+    case h;
+}