diff --git a/composer.json b/composer.json
index 3c7541dc..f670a270 100644
--- a/composer.json
+++ b/composer.json
@@ -40,10 +40,6 @@
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         "symfony/validator": "^2.7 || ^3.0 || ^4.0 || ^5.0"
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-        "symfony/polyfill-php71": "*"
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     "bin": ["bin/schema"],
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diff --git a/composer.lock b/composer.lock
index 0d4fb7e0..654a7e21 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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+    "content-hash": "2595b2e25491c5228dda7af3eedc490f",
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@@ -373,16 +373,16 @@
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+            "version": "v2.16.1",
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                 "url": "https://github.com/FriendsOfPHP/PHP-CS-Fixer.git",
-                "reference": "ceaff36bee1ed3f1bbbedca36d2528c0826c336d"
+                "reference": "c8afb599858876e95e8ebfcd97812d383fa23f02"
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-                "reference": "ceaff36bee1ed3f1bbbedca36d2528c0826c336d",
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@@ -393,15 +393,15 @@
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-                "symfony/finder": "^3.0 || ^4.0",
-                "symfony/options-resolver": "^3.0 || ^4.0",
+                "symfony/console": "^3.4.17 || ^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",
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                 "symfony/polyfill-php72": "^1.4",
-                "symfony/process": "^3.0 || ^4.0",
-                "symfony/stopwatch": "^3.0 || ^4.0"
+                "symfony/process": "^3.0 || ^4.0 || ^5.0",
+                "symfony/stopwatch": "^3.0 || ^4.0 || ^5.0"
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@@ -414,8 +414,8 @@
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                 "phpunitgoodpractices/traits": "^1.8",
-                "symfony/phpunit-bridge": "^4.3",
-                "symfony/yaml": "^3.0 || ^4.0"
+                "symfony/phpunit-bridge": "^4.3 || ^5.0",
+                "symfony/yaml": "^3.0 || ^4.0 || ^5.0"
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@@ -458,20 +458,20 @@
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+            "time": "2019-11-25T22:10:32+00:00"
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+            "version": "4.9.1",
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                 "url": "https://github.com/thephpleague/html-to-markdown.git",
-                "reference": "71319108e3db506250b8987721b13568fd9fa446"
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@@ -522,7 +522,52 @@
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-            "time": "2019-11-02T14:54:14+00:00"
+            "time": "2019-12-28T01:32:28+00:00"
+        },
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+            "version": "v9.99.99",
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+            "require": {
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+            "require-dev": {
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+                "vimeo/psalm": "^1"
+            },
+            "suggest": {
+                "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
+            },
+            "type": "library",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "name": "Paragon Initiative Enterprises",
+                    "email": "security@paragonie.com",
+                    "homepage": "https://paragonie.com"
+                }
+            ],
+            "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
+            "keywords": [
+                "csprng",
+                "polyfill",
+                "pseudorandom",
+                "random"
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@@ -624,6 +669,52 @@
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+                "url": "https://github.com/php-fig/event-dispatcher.git",
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+                    "Psr\\EventDispatcher\\": "src/"
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
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+            "description": "Standard interfaces for event handling.",
+            "keywords": [
+                "events",
+                "psr",
+                "psr-14"
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+            "time": "2019-01-08T18:20:26+00:00"
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@@ -673,16 +764,16 @@
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-            "version": "v5.0.0",
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                 "url": "https://github.com/symfony/config.git",
-                "reference": "10cb9692805d2152fe2ecb3af018c188c712bba8"
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@@ -733,45 +824,45 @@
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-            "time": "2019-11-18T17:27:11+00:00"
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                 "url": "https://github.com/symfony/console.git",
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-                "symfony/event-dispatcher": "<4.3|>=5",
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-                "symfony/dependency-injection": "^3.4|^4.0|^5.0",
-                "symfony/event-dispatcher": "^4.3",
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+                "symfony/dependency-injection": "^4.4|^5.0",
+                "symfony/event-dispatcher": "^4.4|^5.0",
                 "symfony/lock": "^4.4|^5.0",
-                "symfony/process": "^3.4|^4.0|^5.0",
-                "symfony/var-dumper": "^4.3|^5.0"
+                "symfony/process": "^4.4|^5.0",
+                "symfony/var-dumper": "^4.4|^5.0"
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@@ -782,7 +873,7 @@
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@@ -809,41 +900,41 @@
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+                "symfony/config": "^4.4|^5.0",
+                "symfony/dependency-injection": "^4.4|^5.0",
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@@ -852,7 +943,7 @@
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@@ -879,33 +970,33 @@
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@@ -937,30 +1028,30 @@
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@@ -987,29 +1078,29 @@
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@@ -1036,29 +1127,29 @@
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@@ -1090,20 +1181,20 @@
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                 "url": "https://github.com/symfony/validator.git",
-                "reference": "4c32fbacd1652271be449be4ebc57eb5c4c8793b"
+                "reference": "ff51ce51b3fc4c312039de2cb302e01c17843899"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/validator/zipball/4c32fbacd1652271be449be4ebc57eb5c4c8793b",
-                "reference": "4c32fbacd1652271be449be4ebc57eb5c4c8793b",
+                "url": "https://api.github.com/repos/symfony/validator/zipball/ff51ce51b3fc4c312039de2cb302e01c17843899",
+                "reference": "ff51ce51b3fc4c312039de2cb302e01c17843899",
                 "shasum": ""
             },
             "require": {
@@ -3616,20 +3718,20 @@
             ],
             "description": "Symfony Validator Component",
             "homepage": "https://symfony.com",
-            "time": "2019-11-18T17:27:11+00:00"
+            "time": "2019-12-17T10:33:13+00:00"
         },
         {
             "name": "symfony/var-dumper",
-            "version": "v5.0.0",
+            "version": "v5.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "956b8b6e4c52186695f592286414601abfcec284"
+                "reference": "d7bc61d5d335fa9b1b91e14bb16861e8ca50f53a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/956b8b6e4c52186695f592286414601abfcec284",
-                "reference": "956b8b6e4c52186695f592286414601abfcec284",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/d7bc61d5d335fa9b1b91e14bb16861e8ca50f53a",
+                "reference": "d7bc61d5d335fa9b1b91e14bb16861e8ca50f53a",
                 "shasum": ""
             },
             "require": {
@@ -3691,11 +3793,11 @@
                 "debug",
                 "dump"
             ],
-            "time": "2019-11-18T17:27:11+00:00"
+            "time": "2019-12-18T13:50:31+00:00"
         },
         {
             "name": "symfony/web-link",
-            "version": "v5.0.0",
+            "version": "v5.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/web-link.git",
diff --git a/phpstan.neon b/phpstan.neon
index afa346b9..e2ca1abc 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,6 +1,7 @@
 parameters:
     inferPrivatePropertyTypeFromConstructor: true
     ignoreErrors:
-    - '#Call to an undefined method Symfony\\Component\\Config\\Definition\\Builder\\NodeDefinition::children\(\)\.#'
     # BC layer
     - '#Call to function method_exists\(\).*getRootNode. will always evaluate to false\.#'
+    - '#Class Symfony\\Component\\Config\\Definition\\Builder\\TreeBuilder constructor invoked with 0 parameters, 1-3 required\.#'
+    - '#Call to an undefined method Symfony\\Component\\Config\\Definition\\Builder\\TreeBuilder::root\(\)\.#'