diff --git a/.docker/php72 b/.docker/php72
index 35deebd53..7ba538513 100644
--- a/.docker/php72
+++ b/.docker/php72
@@ -1 +1,7 @@
 FROM php:7.2-cli
+
+RUN echo '' | \
+    apt-get -y update; \
+    apt-get install -y --no-install-recommends libicu-dev; \
+    docker-php-ext-configure intl; \
+    docker-php-ext-install intl;
diff --git a/.docker/php72_xdebug b/.docker/php72_xdebug
index cf309df3e..eb0812a08 100644
--- a/.docker/php72_xdebug
+++ b/.docker/php72_xdebug
@@ -1,5 +1,9 @@
 FROM php:7.2-cli
 
 RUN echo '' | \
+    apt-get -y update; \
+    apt-get install -y --no-install-recommends libicu-dev; \
+    docker-php-ext-configure intl; \
+    docker-php-ext-install intl; \
     pecl install xdebug; \
     docker-php-ext-enable xdebug;
diff --git a/requirement-checker/composer.lock b/requirement-checker/composer.lock
index 8d465cf28..49f490c70 100644
--- a/requirement-checker/composer.lock
+++ b/requirement-checker/composer.lock
@@ -128,16 +128,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.1",
+            "version": "1.9.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72"
+                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72",
-                "reference": "e6828efaba2c9b79f4499dae1d66ef8bfa7b2b72",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/007c053ae6f31bba39dfa19a7726f56e9763bbea",
+                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea",
                 "shasum": ""
             },
             "require": {
@@ -172,7 +172,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2019-04-07T13:18:21+00:00"
+            "time": "2019-08-09T12:45:53+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -278,35 +278,33 @@
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "1.0.1",
+            "version": "2.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
+                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
-                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/63a995caa1ca9e5590304cd845c15ad6d482a62a",
+                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5"
+                "php": ">=7.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.6"
+                "phpunit/phpunit": "~6"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "2.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "phpDocumentor\\Reflection\\": [
-                        "src"
-                    ]
+                    "phpDocumentor\\Reflection\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -328,30 +326,30 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2017-09-11T18:02:19+00:00"
+            "time": "2018-08-07T13:53:10+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "4.3.1",
+            "version": "4.3.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "bdd9f737ebc2a01c06ea7ff4308ec6697db9b53c"
+                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/bdd9f737ebc2a01c06ea7ff4308ec6697db9b53c",
-                "reference": "bdd9f737ebc2a01c06ea7ff4308ec6697db9b53c",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/b83ff7cfcfee7827e1e78b637a5904fe6a96698e",
+                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.0",
-                "phpdocumentor/reflection-common": "^1.0.0",
-                "phpdocumentor/type-resolver": "^0.4.0",
+                "phpdocumentor/reflection-common": "^1.0.0 || ^2.0.0",
+                "phpdocumentor/type-resolver": "~0.4 || ^1.0.0",
                 "webmozart/assert": "^1.0"
             },
             "require-dev": {
-                "doctrine/instantiator": "~1.0.5",
+                "doctrine/instantiator": "^1.0.5",
                 "mockery/mockery": "^1.0",
                 "phpunit/phpunit": "^6.4"
             },
@@ -379,41 +377,40 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2019-04-30T17:48:53+00:00"
+            "time": "2019-09-12T14:27:41+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "0.4.0",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "9c977708995954784726e25d0cd1dddf4e65b0f7"
+                "reference": "2e32a6d48972b2c1976ed5d8967145b6cec4a4a9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/9c977708995954784726e25d0cd1dddf4e65b0f7",
-                "reference": "9c977708995954784726e25d0cd1dddf4e65b0f7",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/2e32a6d48972b2c1976ed5d8967145b6cec4a4a9",
+                "reference": "2e32a6d48972b2c1976ed5d8967145b6cec4a4a9",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5 || ^7.0",
-                "phpdocumentor/reflection-common": "^1.0"
+                "php": "^7.1",
+                "phpdocumentor/reflection-common": "^2.0"
             },
             "require-dev": {
-                "mockery/mockery": "^0.9.4",
-                "phpunit/phpunit": "^5.2||^4.8.24"
+                "ext-tokenizer": "^7.1",
+                "mockery/mockery": "~1",
+                "phpunit/phpunit": "^7.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "1.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "phpDocumentor\\Reflection\\": [
-                        "src/"
-                    ]
+                    "phpDocumentor\\Reflection\\": "src"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -426,20 +423,21 @@
                     "email": "me@mikevanriel.com"
                 }
             ],
-            "time": "2017-07-14T14:27:02+00:00"
+            "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
+            "time": "2019-08-22T18:11:29+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.8.0",
+            "version": "1.8.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "4ba436b55987b4bf311cb7c6ba82aa528aac0a06"
+                "reference": "1927e75f4ed19131ec9bcc3b002e07fb1173ee76"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/4ba436b55987b4bf311cb7c6ba82aa528aac0a06",
-                "reference": "4ba436b55987b4bf311cb7c6ba82aa528aac0a06",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/1927e75f4ed19131ec9bcc3b002e07fb1173ee76",
+                "reference": "1927e75f4ed19131ec9bcc3b002e07fb1173ee76",
                 "shasum": ""
             },
             "require": {
@@ -460,8 +458,8 @@
                 }
             },
             "autoload": {
-                "psr-0": {
-                    "Prophecy\\": "src/"
+                "psr-4": {
+                    "Prophecy\\": "src/Prophecy"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -489,20 +487,20 @@
                 "spy",
                 "stub"
             ],
-            "time": "2018-08-05T17:53:17+00:00"
+            "time": "2019-06-13T12:50:23+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "7.0.3",
+            "version": "7.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "0317a769a81845c390e19684d9ba25d7f6aa4707"
+                "reference": "aa0d179a13284c7420fc281fc32750e6cc7c9e2f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/0317a769a81845c390e19684d9ba25d7f6aa4707",
-                "reference": "0317a769a81845c390e19684d9ba25d7f6aa4707",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/aa0d179a13284c7420fc281fc32750e6cc7c9e2f",
+                "reference": "aa0d179a13284c7420fc281fc32750e6cc7c9e2f",
                 "shasum": ""
             },
             "require": {
@@ -511,17 +509,17 @@
                 "php": "^7.2",
                 "phpunit/php-file-iterator": "^2.0.2",
                 "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-token-stream": "^3.0.1",
+                "phpunit/php-token-stream": "^3.1.1",
                 "sebastian/code-unit-reverse-lookup": "^1.0.1",
-                "sebastian/environment": "^4.1",
+                "sebastian/environment": "^4.2.2",
                 "sebastian/version": "^2.0.1",
-                "theseer/tokenizer": "^1.1"
+                "theseer/tokenizer": "^1.1.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "^8.0"
+                "phpunit/phpunit": "^8.2.2"
             },
             "suggest": {
-                "ext-xdebug": "^2.6.1"
+                "ext-xdebug": "^2.7.2"
             },
             "type": "library",
             "extra": {
@@ -552,7 +550,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2019-02-26T07:38:26+00:00"
+            "time": "2019-09-17T06:24:36+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -647,16 +645,16 @@
         },
         {
             "name": "phpunit/php-timer",
-            "version": "2.1.1",
+            "version": "2.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "8b389aebe1b8b0578430bda0c7c95a829608e059"
+                "reference": "1038454804406b0b5f5f520358e78c1c2f71501e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/8b389aebe1b8b0578430bda0c7c95a829608e059",
-                "reference": "8b389aebe1b8b0578430bda0c7c95a829608e059",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/1038454804406b0b5f5f520358e78c1c2f71501e",
+                "reference": "1038454804406b0b5f5f520358e78c1c2f71501e",
                 "shasum": ""
             },
             "require": {
@@ -692,20 +690,20 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2019-02-20T10:12:59+00:00"
+            "time": "2019-06-07T04:22:29+00:00"
         },
         {
             "name": "phpunit/php-token-stream",
-            "version": "3.0.1",
+            "version": "3.1.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-token-stream.git",
-                "reference": "c99e3be9d3e85f60646f152f9002d46ed7770d18"
+                "reference": "995192df77f63a59e47f025390d2d1fdf8f425ff"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/c99e3be9d3e85f60646f152f9002d46ed7770d18",
-                "reference": "c99e3be9d3e85f60646f152f9002d46ed7770d18",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/995192df77f63a59e47f025390d2d1fdf8f425ff",
+                "reference": "995192df77f63a59e47f025390d2d1fdf8f425ff",
                 "shasum": ""
             },
             "require": {
@@ -718,7 +716,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.0-dev"
+                    "dev-master": "3.1-dev"
                 }
             },
             "autoload": {
@@ -741,46 +739,47 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2018-10-30T05:52:18+00:00"
+            "time": "2019-09-17T06:23:10+00:00"
         },
         {
             "name": "phpunit/phpunit",
-            "version": "8.1.5",
+            "version": "8.3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "01392d4b5878aa617e8d9bc7a529e5febc8fe956"
+                "reference": "302faed7059fde575cf3403a78c730c5e3a62750"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/01392d4b5878aa617e8d9bc7a529e5febc8fe956",
-                "reference": "01392d4b5878aa617e8d9bc7a529e5febc8fe956",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/302faed7059fde575cf3403a78c730c5e3a62750",
+                "reference": "302faed7059fde575cf3403a78c730c5e3a62750",
                 "shasum": ""
             },
             "require": {
-                "doctrine/instantiator": "^1.1",
+                "doctrine/instantiator": "^1.2.0",
                 "ext-dom": "*",
                 "ext-json": "*",
                 "ext-libxml": "*",
                 "ext-mbstring": "*",
                 "ext-xml": "*",
                 "ext-xmlwriter": "*",
-                "myclabs/deep-copy": "^1.7",
-                "phar-io/manifest": "^1.0.2",
-                "phar-io/version": "^2.0",
+                "myclabs/deep-copy": "^1.9.1",
+                "phar-io/manifest": "^1.0.3",
+                "phar-io/version": "^2.0.1",
                 "php": "^7.2",
-                "phpspec/prophecy": "^1.7",
-                "phpunit/php-code-coverage": "^7.0",
-                "phpunit/php-file-iterator": "^2.0.1",
+                "phpspec/prophecy": "^1.8.1",
+                "phpunit/php-code-coverage": "^7.0.7",
+                "phpunit/php-file-iterator": "^2.0.2",
                 "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-timer": "^2.1",
-                "sebastian/comparator": "^3.0",
-                "sebastian/diff": "^3.0",
-                "sebastian/environment": "^4.1",
-                "sebastian/exporter": "^3.1",
-                "sebastian/global-state": "^3.0",
+                "phpunit/php-timer": "^2.1.2",
+                "sebastian/comparator": "^3.0.2",
+                "sebastian/diff": "^3.0.2",
+                "sebastian/environment": "^4.2.2",
+                "sebastian/exporter": "^3.1.1",
+                "sebastian/global-state": "^3.0.0",
                 "sebastian/object-enumerator": "^3.0.3",
-                "sebastian/resource-operations": "^2.0",
+                "sebastian/resource-operations": "^2.0.1",
+                "sebastian/type": "^1.1.3",
                 "sebastian/version": "^2.0.1"
             },
             "require-dev": {
@@ -789,7 +788,7 @@
             "suggest": {
                 "ext-soap": "*",
                 "ext-xdebug": "*",
-                "phpunit/php-invoker": "^2.0"
+                "phpunit/php-invoker": "^2.0.0"
             },
             "bin": [
                 "phpunit"
@@ -797,7 +796,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "8.1-dev"
+                    "dev-master": "8.3-dev"
                 }
             },
             "autoload": {
@@ -823,7 +822,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2019-05-14T04:57:31+00:00"
+            "time": "2019-09-14T09:12:03+00:00"
         },
         {
             "name": "sebastian/code-unit-reverse-lookup",
@@ -1045,16 +1044,16 @@
         },
         {
             "name": "sebastian/exporter",
-            "version": "3.1.0",
+            "version": "3.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/exporter.git",
-                "reference": "234199f4528de6d12aaa58b612e98f7d36adb937"
+                "reference": "68609e1261d215ea5b21b7987539cbfbe156ec3e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/234199f4528de6d12aaa58b612e98f7d36adb937",
-                "reference": "234199f4528de6d12aaa58b612e98f7d36adb937",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/68609e1261d215ea5b21b7987539cbfbe156ec3e",
+                "reference": "68609e1261d215ea5b21b7987539cbfbe156ec3e",
                 "shasum": ""
             },
             "require": {
@@ -1081,6 +1080,10 @@
                 "BSD-3-Clause"
             ],
             "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
                 {
                     "name": "Jeff Welch",
                     "email": "whatthejeff@gmail.com"
@@ -1089,17 +1092,13 @@
                     "name": "Volker Dusch",
                     "email": "github@wallbash.com"
                 },
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@2bepublished.at"
-                },
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                },
                 {
                     "name": "Adam Harvey",
                     "email": "aharvey@php.net"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
                 }
             ],
             "description": "Provides the functionality to export PHP variables for visualization",
@@ -1108,7 +1107,7 @@
                 "export",
                 "exporter"
             ],
-            "time": "2017-04-03T13:19:02+00:00"
+            "time": "2019-09-14T09:02:43+00:00"
         },
         {
             "name": "sebastian/global-state",
@@ -1351,6 +1350,52 @@
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
             "time": "2018-10-04T04:07:39+00:00"
         },
+        {
+            "name": "sebastian/type",
+            "version": "1.1.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "3aaaa15fa71d27650d62a948be022fe3b48541a3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/3aaaa15fa71d27650d62a948be022fe3b48541a3",
+                "reference": "3aaaa15fa71d27650d62a948be022fe3b48541a3",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "time": "2019-07-02T08:10:15+00:00"
+        },
         {
             "name": "sebastian/version",
             "version": "2.0.1",
@@ -1396,16 +1441,16 @@
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "v1.11.0",
+            "version": "v1.12.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
-                "reference": "82ebae02209c21113908c229e9883c419720738a"
+                "reference": "550ebaac289296ce228a706d0867afc34687e3f4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/82ebae02209c21113908c229e9883c419720738a",
-                "reference": "82ebae02209c21113908c229e9883c419720738a",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/550ebaac289296ce228a706d0867afc34687e3f4",
+                "reference": "550ebaac289296ce228a706d0867afc34687e3f4",
                 "shasum": ""
             },
             "require": {
@@ -1417,7 +1462,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.11-dev"
+                    "dev-master": "1.12-dev"
                 }
             },
             "autoload": {
@@ -1433,13 +1478,13 @@
                 "MIT"
             ],
             "authors": [
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                },
                 {
                     "name": "Gert de Pagter",
                     "email": "BackEndTea@gmail.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
                 }
             ],
             "description": "Symfony polyfill for ctype functions",
@@ -1450,20 +1495,20 @@
                 "polyfill",
                 "portable"
             ],
-            "time": "2019-02-06T07:57:58+00:00"
+            "time": "2019-08-06T08:03:45+00:00"
         },
         {
             "name": "theseer/tokenizer",
-            "version": "1.1.2",
+            "version": "1.1.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "1c42705be2b6c1de5904f8afacef5895cab44bf8"
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/1c42705be2b6c1de5904f8afacef5895cab44bf8",
-                "reference": "1c42705be2b6c1de5904f8afacef5895cab44bf8",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
                 "shasum": ""
             },
             "require": {
@@ -1490,20 +1535,20 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2019-04-04T09:56:43+00:00"
+            "time": "2019-06-13T22:48:21+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.4.0",
+            "version": "1.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9"
+                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/83e253c8e0be5b0257b881e1827274667c5c17a9",
-                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/88e6d84706d09a236046d686bbea96f07b3a34f4",
+                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4",
                 "shasum": ""
             },
             "require": {
@@ -1511,8 +1556,7 @@
                 "symfony/polyfill-ctype": "^1.8"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
+                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
             },
             "type": "library",
             "extra": {
@@ -1541,7 +1585,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2018-12-25T11:19:39+00:00"
+            "time": "2019-08-24T08:43:50+00:00"
         }
     ],
     "aliases": [],
diff --git a/requirement-checker/expected_terminal_diff b/requirement-checker/expected_terminal_diff
index 8b0a0eefa..d4d819fc9 100644
--- a/requirement-checker/expected_terminal_diff
+++ b/requirement-checker/expected_terminal_diff
@@ -24,42 +24,11 @@
 >  *
 >  * @license MIT (c) Fabien Potencier <fabien@symfony.com>
 >  */
-86c93
-<      * @return int[]|null An array composed of the width and the height or null if it could not be parsed
+96c103
+<         return [(int) $matches[2], (int) $matches[1]];
 ---
->      * @return null|int[] An array composed of the width and the height or null if it could not be parsed
-91c98
-<             return;
----
->             return null;
-94,98c101,105
-<         $descriptorspec = [
-<             1 => ['pipe', 'w'],
-<             2 => ['pipe', 'w'],
-<         ];
-<         $process = proc_open('mode CON', $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);
----
->         $descriptorspec = array(
->             1 => array('pipe', 'w'),
->             2 => array('pipe', 'w'),
->         );
->         $process = proc_open('mode CON', $descriptorspec, $pipes, null, null, array('suppress_errors' => true));
-106c113
-<                 return [(int) $matches[2], (int) $matches[1]];
----
->                 return array((int) $matches[2], (int) $matches[1]);
-108a116,117
-> 
->         return null;
-114c123
-<      * @return string|null
----
->      * @return null|string
-119c128
-<             return;
----
->             return null;
-122,125c131,134
+>         return array((int) $matches[2], (int) $matches[1]);
+120,123c127,130
 <         $descriptorspec = [
 <             1 => ['pipe', 'w'],
 <             2 => ['pipe', 'w'],
@@ -69,10 +38,7 @@
 >             1 => array('pipe', 'w'),
 >             2 => array('pipe', 'w'),
 >         );
-127c136
-<         $process = proc_open('stty -a | grep columns', $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);
+125c132
+<         $process = proc_open($command, $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);
 ---
->         $process = proc_open('stty -a | grep columns', $descriptorspec, $pipes, null, null, array('suppress_errors' => true));
-135a145,146
-> 
->         return null;
+>         $process = proc_open($command, $descriptorspec, $pipes, null, null, array('suppress_errors' => true));
diff --git a/requirement-checker/src/Terminal.php b/requirement-checker/src/Terminal.php
index 25fc004ee..483261835 100644
--- a/requirement-checker/src/Terminal.php
+++ b/requirement-checker/src/Terminal.php
@@ -90,39 +90,35 @@ private static function initDimensions()
     /**
      * Runs and parses mode CON if it's available, suppressing any error output.
      *
-     * @return null|int[] An array composed of the width and the height or null if it could not be parsed
+     * @return int[]|null An array composed of the width and the height or null if it could not be parsed
      */
     private static function getConsoleMode()
     {
-        if (!\function_exists('proc_open')) {
-            return null;
-        }
+        $info = self::readFromProcess('mode CON');
 
-        $descriptorspec = array(
-            1 => array('pipe', 'w'),
-            2 => array('pipe', 'w'),
-        );
-        $process = proc_open('mode CON', $descriptorspec, $pipes, null, null, array('suppress_errors' => true));
-        if (\is_resource($process)) {
-            $info = stream_get_contents($pipes[1]);
-            fclose($pipes[1]);
-            fclose($pipes[2]);
-            proc_close($process);
-
-            if (preg_match('/--------+\r?\n.+?(\d+)\r?\n.+?(\d+)\r?\n/', $info, $matches)) {
-                return array((int) $matches[2], (int) $matches[1]);
-            }
+        if (null === $info || !preg_match('/--------+\r?\n.+?(\d+)\r?\n.+?(\d+)\r?\n/', $info, $matches)) {
+            return null;
         }
 
-        return null;
+        return array((int) $matches[2], (int) $matches[1]);
     }
 
     /**
      * Runs and parses stty -a if it's available, suppressing any error output.
      *
-     * @return null|string
+     * @return string|null
      */
     private static function getSttyColumns()
+    {
+        return self::readFromProcess('stty -a | grep columns');
+    }
+
+    /**
+     * @param string $command
+     *
+     * @return string|null
+     */
+    private static function readFromProcess($command)
     {
         if (!\function_exists('proc_open')) {
             return null;
@@ -133,16 +129,16 @@ private static function getSttyColumns()
             2 => array('pipe', 'w'),
         );
 
-        $process = proc_open('stty -a | grep columns', $descriptorspec, $pipes, null, null, array('suppress_errors' => true));
-        if (\is_resource($process)) {
-            $info = stream_get_contents($pipes[1]);
-            fclose($pipes[1]);
-            fclose($pipes[2]);
-            proc_close($process);
-
-            return $info;
+        $process = proc_open($command, $descriptorspec, $pipes, null, null, array('suppress_errors' => true));
+        if (!\is_resource($process)) {
+            return null;
         }
 
-        return null;
+        $info = stream_get_contents($pipes[1]);
+        fclose($pipes[1]);
+        fclose($pipes[2]);
+        proc_close($process);
+
+        return $info;
     }
 }
diff --git a/tests/Composer/ComposerOrchestratorTest.php b/tests/Composer/ComposerOrchestratorTest.php
index 63450c5c3..13a902e7f 100644
--- a/tests/Composer/ComposerOrchestratorTest.php
+++ b/tests/Composer/ComposerOrchestratorTest.php
@@ -515,7 +515,9 @@ public function provideComposerAutoload(): Generator
 
 // Aliases for the whitelisted classes. For more information see:
 // https://github.com/humbug/php-scoper/blob/master/README.md#class-whitelisting
-class_exists('_Box\Acme\Foo');
+if (!class_exists('Acme\Foo', false)) {
+    class_exists('_Box\Acme\Foo');
+}
 
 return \$loader;