diff --git a/composer.lock b/composer.lock
index 30605d08..645b8e71 100644
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+            "version": "v5.2.1",
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                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "fd8305521692f27eae3263895d1ef1571c71a78d"
+                "reference": "0b9231a5922fd7287ba5b411893c0ecd2733e5ba"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/fd8305521692f27eae3263895d1ef1571c71a78d",
-                "reference": "fd8305521692f27eae3263895d1ef1571c71a78d",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/0b9231a5922fd7287ba5b411893c0ecd2733e5ba",
+                "reference": "0b9231a5922fd7287ba5b411893c0ecd2733e5ba",
                 "shasum": ""
             },
             "require": {
@@ -2631,7 +2623,7 @@
             "description": "Symfony Finder Component",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/finder/tree/v5.2.0"
+                "source": "https://github.com/symfony/finder/tree/v5.2.1"
             },
             "funding": [
                 {
@@ -2647,20 +2639,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-11-18T09:42:36+00:00"
+            "time": "2020-12-08T17:02:38+00:00"
         },
         {
             "name": "symfony/phpunit-bridge",
-            "version": "v5.2.0",
+            "version": "v5.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/phpunit-bridge.git",
-                "reference": "92a76ca5e64effd41ce111b8f476144dfa29f1f0"
+                "reference": "235823f6d215c9bd930a47a496e62c1354cde55b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/phpunit-bridge/zipball/92a76ca5e64effd41ce111b8f476144dfa29f1f0",
-                "reference": "92a76ca5e64effd41ce111b8f476144dfa29f1f0",
+                "url": "https://api.github.com/repos/symfony/phpunit-bridge/zipball/235823f6d215c9bd930a47a496e62c1354cde55b",
+                "reference": "235823f6d215c9bd930a47a496e62c1354cde55b",
                 "shasum": ""
             },
             "require": {
@@ -2714,7 +2706,7 @@
             "description": "Symfony PHPUnit Bridge",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/phpunit-bridge/tree/v5.2.0"
+                "source": "https://github.com/symfony/phpunit-bridge/tree/v5.2.1"
             },
             "funding": [
                 {
@@ -2730,20 +2722,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-11-27T00:39:34+00:00"
+            "time": "2020-12-14T22:27:17+00:00"
         },
         {
             "name": "symfony/polyfill-intl-grapheme",
-            "version": "v1.20.0",
+            "version": "v1.22.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-intl-grapheme.git",
-                "reference": "c7cf3f858ec7d70b89559d6e6eb1f7c2517d479c"
+                "reference": "267a9adeb8ecb8071040a740930e077cdfb987af"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-intl-grapheme/zipball/c7cf3f858ec7d70b89559d6e6eb1f7c2517d479c",
-                "reference": "c7cf3f858ec7d70b89559d6e6eb1f7c2517d479c",
+                "url": "https://api.github.com/repos/symfony/polyfill-intl-grapheme/zipball/267a9adeb8ecb8071040a740930e077cdfb987af",
+                "reference": "267a9adeb8ecb8071040a740930e077cdfb987af",
                 "shasum": ""
             },
             "require": {
@@ -2755,7 +2747,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "1.20-dev"
+                    "dev-main": "1.22-dev"
                 },
                 "thanks": {
                     "name": "symfony/polyfill",
@@ -2795,7 +2787,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-intl-grapheme/tree/v1.20.0"
+                "source": "https://github.com/symfony/polyfill-intl-grapheme/tree/v1.22.0"
             },
             "funding": [
                 {
@@ -2811,20 +2803,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-10-23T14:02:19+00:00"
+            "time": "2021-01-07T16:49:33+00:00"
         },
         {
             "name": "symfony/polyfill-intl-normalizer",
-            "version": "v1.20.0",
+            "version": "v1.22.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-intl-normalizer.git",
-                "reference": "727d1096295d807c309fb01a851577302394c897"
+                "reference": "6e971c891537eb617a00bb07a43d182a6915faba"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/727d1096295d807c309fb01a851577302394c897",
-                "reference": "727d1096295d807c309fb01a851577302394c897",
+                "url": "https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/6e971c891537eb617a00bb07a43d182a6915faba",
+                "reference": "6e971c891537eb617a00bb07a43d182a6915faba",
                 "shasum": ""
             },
             "require": {
@@ -2836,7 +2828,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "1.20-dev"
+                    "dev-main": "1.22-dev"
                 },
                 "thanks": {
                     "name": "symfony/polyfill",
@@ -2879,7 +2871,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.20.0"
+                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.22.0"
             },
             "funding": [
                 {
@@ -2895,20 +2887,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-10-23T14:02:19+00:00"
+            "time": "2021-01-07T17:09:11+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.20.0",
+            "version": "v1.22.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "39d483bdf39be819deabf04ec872eb0b2410b531"
+                "reference": "f377a3dd1fde44d37b9831d68dc8dea3ffd28e13"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/39d483bdf39be819deabf04ec872eb0b2410b531",
-                "reference": "39d483bdf39be819deabf04ec872eb0b2410b531",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/f377a3dd1fde44d37b9831d68dc8dea3ffd28e13",
+                "reference": "f377a3dd1fde44d37b9831d68dc8dea3ffd28e13",
                 "shasum": ""
             },
             "require": {
@@ -2920,7 +2912,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "1.20-dev"
+                    "dev-main": "1.22-dev"
                 },
                 "thanks": {
                     "name": "symfony/polyfill",
@@ -2959,7 +2951,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.20.0"
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.22.0"
             },
             "funding": [
                 {
@@ -2975,20 +2967,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-10-23T14:02:19+00:00"
+            "time": "2021-01-07T16:49:33+00:00"
         },
         {
             "name": "symfony/polyfill-php73",
-            "version": "v1.20.0",
+            "version": "v1.22.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php73.git",
-                "reference": "8ff431c517be11c78c48a39a66d37431e26a6bed"
+                "reference": "a678b42e92f86eca04b7fa4c0f6f19d097fb69e2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/8ff431c517be11c78c48a39a66d37431e26a6bed",
-                "reference": "8ff431c517be11c78c48a39a66d37431e26a6bed",
+                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/a678b42e92f86eca04b7fa4c0f6f19d097fb69e2",
+                "reference": "a678b42e92f86eca04b7fa4c0f6f19d097fb69e2",
                 "shasum": ""
             },
             "require": {
@@ -2997,7 +2989,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "1.20-dev"
+                    "dev-main": "1.22-dev"
                 },
                 "thanks": {
                     "name": "symfony/polyfill",
@@ -3038,7 +3030,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-php73/tree/v1.20.0"
+                "source": "https://github.com/symfony/polyfill-php73/tree/v1.22.0"
             },
             "funding": [
                 {
@@ -3054,7 +3046,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-10-23T14:02:19+00:00"
+            "time": "2021-01-07T16:49:33+00:00"
         },
         {
             "name": "symfony/service-contracts",
@@ -3137,16 +3129,16 @@
         },
         {
             "name": "symfony/string",
-            "version": "v5.2.0",
+            "version": "v5.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/string.git",
-                "reference": "40e975edadd4e32cd16f3753b3bad65d9ac48242"
+                "reference": "5bd67751d2e3f7d6f770c9154b8fbcb2aa05f7ed"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/string/zipball/40e975edadd4e32cd16f3753b3bad65d9ac48242",
-                "reference": "40e975edadd4e32cd16f3753b3bad65d9ac48242",
+                "url": "https://api.github.com/repos/symfony/string/zipball/5bd67751d2e3f7d6f770c9154b8fbcb2aa05f7ed",
+                "reference": "5bd67751d2e3f7d6f770c9154b8fbcb2aa05f7ed",
                 "shasum": ""
             },
             "require": {
@@ -3200,7 +3192,7 @@
                 "utf8"
             ],
             "support": {
-                "source": "https://github.com/symfony/string/tree/v5.2.0"
+                "source": "https://github.com/symfony/string/tree/v5.2.1"
             },
             "funding": [
                 {
@@ -3216,7 +3208,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-10-24T12:08:07+00:00"
+            "time": "2020-12-05T07:33:16+00:00"
         }
     ],
     "aliases": [],
diff --git a/src/ExerciseRunner/CgiRunner.php b/src/ExerciseRunner/CgiRunner.php
index 053e103d..f6547f4f 100644
--- a/src/ExerciseRunner/CgiRunner.php
+++ b/src/ExerciseRunner/CgiRunner.php
@@ -23,6 +23,7 @@
 use PhpSchool\PhpWorkshop\Result\Cgi\RequestFailure;
 use PhpSchool\PhpWorkshop\Result\Cgi\GenericFailure;
 use PhpSchool\PhpWorkshop\Result\Cgi\Success;
+use PhpSchool\PhpWorkshop\Result\Cgi\ResultInterface as CgiResultInterface;
 use PhpSchool\PhpWorkshop\Result\ResultInterface;
 use PhpSchool\PhpWorkshop\Utils\RequestRenderer;
 use Psr\Http\Message\RequestInterface;
@@ -124,9 +125,9 @@ public function getRequiredChecks(): array
     /**
      * @param RequestInterface $request
      * @param string $fileName
-     * @return ResultInterface
+     * @return CgiResultInterface
      */
-    private function checkRequest(RequestInterface $request, string $fileName): ResultInterface
+    private function checkRequest(RequestInterface $request, string $fileName): CgiResultInterface
     {
         try {
             /** @var CgiExecuteEvent $event */
diff --git a/src/ExerciseRunner/CliRunner.php b/src/ExerciseRunner/CliRunner.php
index af3fa4c9..3cf0736c 100644
--- a/src/ExerciseRunner/CliRunner.php
+++ b/src/ExerciseRunner/CliRunner.php
@@ -22,6 +22,7 @@
 use PhpSchool\PhpWorkshop\Result\Cli\CliResult;
 use PhpSchool\PhpWorkshop\Result\Cli\GenericFailure;
 use PhpSchool\PhpWorkshop\Result\Cli\Success;
+use PhpSchool\PhpWorkshop\Result\Cli\ResultInterface as CliResultInterface;
 use PhpSchool\PhpWorkshop\Result\ResultInterface;
 use PhpSchool\PhpWorkshop\Utils\ArrayObject;
 use Symfony\Component\Process\Process;
@@ -176,9 +177,9 @@ private function preserveOldArgFormat(array $args): array
     /**
      * @param array<string> $args
      * @param Input $input
-     * @return ResultInterface
+     * @return CliResultInterface
      */
-    private function doVerify(array $args, Input $input): ResultInterface
+    private function doVerify(array $args, Input $input): CliResultInterface
     {
         //arrays are not pass-by-ref
         $args = new ArrayObject($args);
diff --git a/src/Result/FunctionRequirementsFailure.php b/src/Result/FunctionRequirementsFailure.php
index 3c69f1fc..647b3fe6 100644
--- a/src/Result/FunctionRequirementsFailure.php
+++ b/src/Result/FunctionRequirementsFailure.php
@@ -15,7 +15,7 @@ class FunctionRequirementsFailure implements FailureInterface
     use ResultTrait;
 
     /**
-     * @var array<int, string>
+     * @var array<array{function: string, line: int}>
      */
     private $bannedFunctions;
 
@@ -26,8 +26,8 @@ class FunctionRequirementsFailure implements FailureInterface
 
     /**
      * @param CheckInterface $check The check that produced this result.
-     * @param array<int, string> $bannedFunctions A list of functions that were used, but were banned.
-     * @param array<int, string> $missingFunctions A list of functions that were not used, but were required.
+     * @param array<array{function: string, line: int}> $bannedFunctions Functions that were used, but were banned.
+     * @param array<int, string> $missingFunctions Functions that were not used, but were required.
      */
     public function __construct(CheckInterface $check, array $bannedFunctions, array $missingFunctions)
     {
@@ -39,7 +39,7 @@ public function __construct(CheckInterface $check, array $bannedFunctions, array
     /**
      * Get the list of functions that were used, but were banned.
      *
-     * @return array<int, string>
+     * @return array<array{function: string, line: int}>
      */
     public function getBannedFunctions(): array
     {
diff --git a/src/Utils/ArrayObject.php b/src/Utils/ArrayObject.php
index c6b33579..f4d2da34 100644
--- a/src/Utils/ArrayObject.php
+++ b/src/Utils/ArrayObject.php
@@ -100,6 +100,16 @@ public function collapse(): self
         return new static($results);
     }
 
+    /**
+     * @return static
+     */
+    public function ksort(): self
+    {
+        $data = $this->getArrayCopy();
+        ksort($data);
+        return new static($data);
+    }
+
     /**
      * Reduce the items to a single value.
      *
diff --git a/test/Util/ArrayObjectTest.php b/test/Util/ArrayObjectTest.php
index bca6899c..1e44dc64 100644
--- a/test/Util/ArrayObjectTest.php
+++ b/test/Util/ArrayObjectTest.php
@@ -175,4 +175,21 @@ public function testEach(): void
 
         $this->assertEquals($original, $result);
     }
+
+    public function testKstort()
+    {
+        $arrayObject = new ArrayObject([
+            'z' => 'more test data',
+            'a' => 'test data',
+            't' => 'yup moar test data'
+        ]);
+
+        $expected = [
+            'a' => 'test data',
+            't' => 'yup moar test data',
+            'z' => 'more test data',
+        ];
+
+        $this->assertEquals($expected, $arrayObject->ksort()->getArrayCopy());
+    }
 }