diff --git a/src/Storage/EnvStorage.php b/src/Storage/EnvStorage.php
index fb809c8..629c2d3 100644
--- a/src/Storage/EnvStorage.php
+++ b/src/Storage/EnvStorage.php
@@ -20,7 +20,7 @@ class EnvStorage implements StorageInterface
      */
     public function get(string $key)
     {
-        return $_ENV[$key] ?? $_SERVER[$key] ?? getenv($key) ?? null;
+        return $_ENV[$key] ?? $_SERVER[$key] ?? getenv($key);
     }
 
     /**
diff --git a/src/Storage/StorageInterface.php b/src/Storage/StorageInterface.php
index ecfb105..3ffd5c3 100644
--- a/src/Storage/StorageInterface.php
+++ b/src/Storage/StorageInterface.php
@@ -27,7 +27,7 @@ public function get(string $key);
     /**
      * Returns a list of all the configured features.
      *
-     * @return list<string>
+     * @return array<int|string, mixed>
      */
     public function all(): array;
 }
diff --git a/src/Symfony/Command/ToggleListCommand.php b/src/Symfony/Command/ToggleListCommand.php
index 8afe83d..2cb7b29 100644
--- a/src/Symfony/Command/ToggleListCommand.php
+++ b/src/Symfony/Command/ToggleListCommand.php
@@ -79,7 +79,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $table->setHeaders($headers);
 
         foreach ($this->toggleStorage->all() as $feature) {
-            $active = $this->toggle->isActive($feature, $context);
+            $active = $this->toggle->isActive(strval($feature), $context);
 
             $row = [
                 $feature,