Code cleanup

Author: ADmad

src/Cache/Cache.php

@@ -209,13 +209,13 @@ public static function pool(string $config): CacheInterface&CacheEngineInterface
 
         $registry = static::getRegistry();
 
-        if (isset($registry->{$config})) {
-            return $registry->{$config};
+        if ($registry->has($config)) {
+            return $registry->get($config);
         }
 
         static::_buildEngine($config);
 
-        return $registry->{$config};
+        return $registry->get($config);
     }
 
     /**

src/Http/Client/Adapter/Curl.php

@@ -46,6 +46,10 @@ public function send(RequestInterface $request, array $options): array
         }
 
         $ch = curl_init();
+        if ($ch === false) {
+            throw new ClientException('Could not initialize curl session.');
+        }
+
         $options = $this->buildOptions($request, $options);
         curl_setopt_array($ch, $options);