diff --git a/.php_cs b/.php_cs
index 981148fc..6143fe04 100644
--- a/.php_cs
+++ b/.php_cs
@@ -13,6 +13,7 @@ EOF;
 
 $config = Config\Factory::fromRuleSet(new Config\RuleSet\Php71($header), [
     'mb_str_functions' => false,
+    'no_unset_on_property' => false,
 ]);
 
 $config->getFinder()->in(__DIR__);
diff --git a/composer.json b/composer.json
index 6c9c3bb2..33a56e43 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
   },
   "require-dev": {
     "infection/infection": "~0.8.1",
-    "localheinz/php-cs-fixer-config": "~1.13.1",
+    "localheinz/php-cs-fixer-config": "~1.14.0",
     "localheinz/test-util": "0.6.1",
     "phpbench/phpbench": "~0.14.0",
     "phpspec/prophecy": "^1.7.1",
diff --git a/composer.lock b/composer.lock
index 3f800747..8846e153 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b23c8a997a4ba79e5851e89571f5e278",
+    "content-hash": "edb53a2bbfdd7fc1ec3d862ad6ff189c",
     "packages": [
         {
             "name": "justinrainbow/json-schema",
@@ -296,6 +296,50 @@
             ],
             "time": "2016-08-30T16:08:34+00:00"
         },
+        {
+            "name": "composer/xdebug-handler",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/xdebug-handler.git",
+                "reference": "c919dc6c62e221fc6406f861ea13433c0aa24f08"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/c919dc6c62e221fc6406f861ea13433c0aa24f08",
+                "reference": "c919dc6c62e221fc6406f861ea13433c0aa24f08",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0",
+                "psr/log": "^1.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Composer\\XdebugHandler\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "John Stevenson",
+                    "email": "john-stevenson@blueyonder.co.uk"
+                }
+            ],
+            "description": "Restarts a process without xdebug.",
+            "keywords": [
+                "Xdebug",
+                "performance"
+            ],
+            "time": "2018-04-11T15:42:36+00:00"
+        },
         {
             "name": "container-interop/container-interop",
             "version": "1.2.0",
@@ -505,20 +549,21 @@
         },
         {
             "name": "friendsofphp/php-cs-fixer",
-            "version": "v2.11.1",
+            "version": "v2.12.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/FriendsOfPHP/PHP-CS-Fixer.git",
-                "reference": "ad94441c17b8ef096e517acccdbf3238af8a2da8"
+                "reference": "a53f39a72cf0baa03909fae779a4de6d3772c74f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/ad94441c17b8ef096e517acccdbf3238af8a2da8",
-                "reference": "ad94441c17b8ef096e517acccdbf3238af8a2da8",
+                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/a53f39a72cf0baa03909fae779a4de6d3772c74f",
+                "reference": "a53f39a72cf0baa03909fae779a4de6d3772c74f",
                 "shasum": ""
             },
             "require": {
                 "composer/semver": "^1.4",
+                "composer/xdebug-handler": "^1.0",
                 "doctrine/annotations": "^1.2",
                 "ext-json": "*",
                 "ext-tokenizer": "*",
@@ -540,16 +585,20 @@
             "require-dev": {
                 "johnkary/phpunit-speedtrap": "^1.1 || ^2.0 || ^3.0",
                 "justinrainbow/json-schema": "^5.0",
-                "keradus/cli-executor": "^1.0",
+                "keradus/cli-executor": "^1.1",
                 "mikey179/vfsstream": "^1.6",
-                "php-coveralls/php-coveralls": "^2.0",
+                "php-coveralls/php-coveralls": "^2.1",
                 "php-cs-fixer/accessible-object": "^1.0",
-                "phpunit/phpunit": "^5.7.23 || ^6.4.3 || ^7.0",
-                "phpunitgoodpractices/traits": "^1.3.1",
-                "symfony/phpunit-bridge": "^3.2.2 || ^4.0"
+                "php-cs-fixer/phpunit-constraint-isidenticalstring": "^1.0",
+                "php-cs-fixer/phpunit-constraint-xmlmatchesxsd": "^1.0",
+                "phpunit/phpunit": "^5.7.27 || ^6.5.8 || ^7.1",
+                "phpunitgoodpractices/traits": "^1.4",
+                "symfony/phpunit-bridge": "^4.0"
             },
             "suggest": {
                 "ext-mbstring": "For handling non-UTF8 characters in cache signature.",
+                "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."
             },
             "bin": [
@@ -558,7 +607,7 @@
             "type": "application",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.11-dev"
+                    "dev-master": "2.12-dev"
                 }
             },
             "autoload": {
@@ -570,9 +619,6 @@
                     "tests/Test/AbstractIntegrationCaseFactory.php",
                     "tests/Test/AbstractIntegrationTestCase.php",
                     "tests/Test/Assert/AssertTokensTrait.php",
-                    "tests/Test/Constraint/SameStringsConstraint.php",
-                    "tests/Test/Constraint/SameStringsConstraintForV5.php",
-                    "tests/Test/Constraint/SameStringsConstraintForV7.php",
                     "tests/Test/IntegrationCase.php",
                     "tests/Test/IntegrationCaseFactory.php",
                     "tests/Test/IntegrationCaseFactoryInterface.php",
@@ -595,7 +641,7 @@
                 }
             ],
             "description": "A tool to automatically fix PHP code style",
-            "time": "2018-03-21T17:41:26+00:00"
+            "time": "2018-06-02T17:33:35+00:00"
         },
         {
             "name": "fzaninotto/faker",
@@ -755,20 +801,20 @@
         },
         {
             "name": "localheinz/php-cs-fixer-config",
-            "version": "1.13.1",
+            "version": "1.14.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/localheinz/php-cs-fixer-config.git",
-                "reference": "19e7775f48fedf7067200909e2761cc487253be0"
+                "reference": "7ba3d0286522dbe15bdd34a78ee4ec865fec56d4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/localheinz/php-cs-fixer-config/zipball/19e7775f48fedf7067200909e2761cc487253be0",
-                "reference": "19e7775f48fedf7067200909e2761cc487253be0",
+                "url": "https://api.github.com/repos/localheinz/php-cs-fixer-config/zipball/7ba3d0286522dbe15bdd34a78ee4ec865fec56d4",
+                "reference": "7ba3d0286522dbe15bdd34a78ee4ec865fec56d4",
                 "shasum": ""
             },
             "require": {
-                "friendsofphp/php-cs-fixer": "^2.11.1",
+                "friendsofphp/php-cs-fixer": "^2.12.0",
                 "php": "^5.6 || ^7.0"
             },
             "require-dev": {
@@ -792,7 +838,7 @@
             ],
             "description": "Provides a configuration factory and multiple rule sets for friendsofphp/php-cs-fixer.",
             "homepage": "https://github.com/localheinz/php-cs-fixer-config",
-            "time": "2018-03-21T21:17:46+00:00"
+            "time": "2018-06-02T22:18:38+00:00"
         },
         {
             "name": "localheinz/test-util",
@@ -2918,16 +2964,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v4.0.8",
+            "version": "v4.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "aad9a6fe47319f22748fd764f52d3a7ca6fa6b64"
+                "reference": "2d5d973bf9933d46802b01010bd25c800c87c242"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/aad9a6fe47319f22748fd764f52d3a7ca6fa6b64",
-                "reference": "aad9a6fe47319f22748fd764f52d3a7ca6fa6b64",
+                "url": "https://api.github.com/repos/symfony/console/zipball/2d5d973bf9933d46802b01010bd25c800c87c242",
+                "reference": "2d5d973bf9933d46802b01010bd25c800c87c242",
                 "shasum": ""
             },
             "require": {
@@ -2947,7 +2993,7 @@
                 "symfony/process": "~3.4|~4.0"
             },
             "suggest": {
-                "psr/log": "For using the console logger",
+                "psr/log-implementation": "For using the console logger",
                 "symfony/event-dispatcher": "",
                 "symfony/lock": "",
                 "symfony/process": ""
@@ -2955,7 +3001,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.0-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
             "autoload": {
@@ -2982,7 +3028,7 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2018-04-03T05:24:00+00:00"
+            "time": "2018-05-30T07:26:09+00:00"
         },
         {
             "name": "symfony/debug",
@@ -3042,16 +3088,16 @@
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v4.0.8",
+            "version": "v4.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
-                "reference": "63353a71073faf08f62caab4e6889b06a787f07b"
+                "reference": "2391ed210a239868e7256eb6921b1bd83f3087b5"
             },
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-                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/63353a71073faf08f62caab4e6889b06a787f07b",
-                "reference": "63353a71073faf08f62caab4e6889b06a787f07b",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/2391ed210a239868e7256eb6921b1bd83f3087b5",
+                "reference": "2391ed210a239868e7256eb6921b1bd83f3087b5",
                 "shasum": ""
             },
             "require": {
@@ -3074,7 +3120,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.0-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
             "autoload": {
@@ -3101,29 +3147,30 @@
             ],
             "description": "Symfony EventDispatcher Component",
             "homepage": "https://symfony.com",
-            "time": "2018-04-06T07:35:43+00:00"
+            "time": "2018-04-06T07:35:57+00:00"
         },
         {
             "name": "symfony/filesystem",
-            "version": "v4.0.8",
+            "version": "v4.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "5d2d655b2c72fc4d9bf7e9bf14f72a447b940f21"
+                "reference": "562bf7005b55fd80d26b582d28e3e10f2dd5ae9c"
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             "dist": {
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-                "url": "https://api.github.com/repos/symfony/filesystem/zipball/5d2d655b2c72fc4d9bf7e9bf14f72a447b940f21",
-                "reference": "5d2d655b2c72fc4d9bf7e9bf14f72a447b940f21",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/562bf7005b55fd80d26b582d28e3e10f2dd5ae9c",
+                "reference": "562bf7005b55fd80d26b582d28e3e10f2dd5ae9c",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3"
+                "php": "^7.1.3",
+                "symfony/polyfill-ctype": "~1.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.0-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
             "autoload": {
@@ -3150,20 +3197,20 @@
             ],
             "description": "Symfony Filesystem Component",
             "homepage": "https://symfony.com",
-            "time": "2018-02-22T10:50:29+00:00"
+            "time": "2018-05-30T07:26:09+00:00"
         },
         {
             "name": "symfony/finder",
-            "version": "v4.0.8",
+            "version": "v4.1.0",
             "source": {
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                 "url": "https://github.com/symfony/finder.git",
-                "reference": "ca27c02b7a3fef4828c998c2ff9ba7aae1641c49"
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-                "reference": "ca27c02b7a3fef4828c998c2ff9ba7aae1641c49",
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+                "reference": "087e2ee0d74464a4c6baac4e90417db7477dc238",
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@@ -3172,7 +3219,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.0-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
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@@ -3199,20 +3246,20 @@
             ],
             "description": "Symfony Finder Component",
             "homepage": "https://symfony.com",
-            "time": "2018-04-04T05:10:37+00:00"
+            "time": "2018-05-16T14:33:22+00:00"
         },
         {
             "name": "symfony/options-resolver",
-            "version": "v4.0.8",
+            "version": "v4.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/options-resolver.git",
-                "reference": "371532a2cfe932f7a3766dd4c45364566def1dd0"
+                "reference": "9b9ab6043c57c8c5571bc846e6ebfd27dff3b589"
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-                "reference": "371532a2cfe932f7a3766dd4c45364566def1dd0",
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@@ -3221,7 +3268,7 @@
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             "extra": {
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-                    "dev-master": "4.0-dev"
+                    "dev-master": "4.1-dev"
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             "autoload": {
@@ -3253,20 +3300,75 @@
                 "configuration",
                 "options"
             ],
-            "time": "2018-01-18T22:19:33+00:00"
+            "time": "2018-05-30T07:26:09+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.8.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "7cc359f1b7b80fc25ed7796be7d96adc9b354bae"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/7cc359f1b7b80fc25ed7796be7d96adc9b354bae",
+                "reference": "7cc359f1b7b80fc25ed7796be7d96adc9b354bae",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                },
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2018-04-30T19:57:29+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.7.0",
+            "version": "v1.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "78be803ce01e55d3491c1397cf1c64beb9c1b63b"
+                "reference": "3296adf6a6454a050679cde90f95350ad604b171"
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@@ -3278,7 +3380,7 @@
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             "extra": {
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-                    "dev-master": "1.7-dev"
+                    "dev-master": "1.8-dev"
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@@ -3312,20 +3414,20 @@
                 "portable",
                 "shim"
             ],
-            "time": "2018-01-30T19:27:44+00:00"
+            "time": "2018-04-26T10:06:28+00:00"
         },
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-            "version": "v1.7.0",
+            "version": "v1.8.0",
             "source": {
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                 "url": "https://github.com/symfony/polyfill-php70.git",
-                "reference": "3532bfcd8f933a7816f3a0a59682fc404776600f"
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@@ -3335,7 +3437,7 @@
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             "extra": {
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-                    "dev-master": "1.7-dev"
+                    "dev-master": "1.8-dev"
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@@ -3371,20 +3473,20 @@
                 "portable",
                 "shim"
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-            "time": "2018-01-30T19:27:44+00:00"
+            "time": "2018-04-26T10:06:28+00:00"
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         {
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-            "version": "v1.7.0",
+            "version": "v1.8.0",
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