diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1a30a02..3df289a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -77,7 +77,7 @@ jobs:
         run: composer install --no-interaction --no-progress --no-scripts --ansi
 
       - name: php-cs-fixer
-        run: vendor/bin/php-cs-fixer fix --dry-run --ansi
+        run: vendor/bin/php-cs-fixer fix --dry-run --ansi -v
 
   phpspec:
     name: PHPSpec
diff --git a/src/Http/HttpMessageHelper.php b/src/Http/HttpMessageHelper.php
index 95ff49f..52b3d58 100644
--- a/src/Http/HttpMessageHelper.php
+++ b/src/Http/HttpMessageHelper.php
@@ -24,7 +24,7 @@ public static function formatHeadersForSpanAttribute(array $headers): string
                 $values = [$values];
             }
             foreach ($values as $value) {
-                $lines[] = sprintf('%s: %s', mb_strtolower($name), $value);
+                $lines[] = \sprintf('%s: %s', mb_strtolower($name), $value);
             }
         }
 
@@ -34,7 +34,7 @@ public static function formatHeadersForSpanAttribute(array $headers): string
     /**
      * @param array<string,string|string[]> $headers
      */
-    public static function getContentType(array $headers): ?string
+    public static function getContentType(array $headers): string|null
     {
         $headers = HttpSensitiveDataHelper::filterHeaders($headers);
 
diff --git a/src/Http/TracedResponse.php b/src/Http/TracedResponse.php
index 61965d2..7a05729 100644
--- a/src/Http/TracedResponse.php
+++ b/src/Http/TracedResponse.php
@@ -87,7 +87,7 @@ public function cancel(): void
         }
     }
 
-    public function getInfo(string $type = null): mixed
+    public function getInfo(string|null $type = null): mixed
     {
         return $this->response->getInfo($type);
     }
@@ -123,7 +123,7 @@ public static function stream(HttpClientInterface $client, iterable $responses,
 
         foreach ($responses as $r) {
             if (!$r instanceof self) {
-                throw new \TypeError(sprintf('"%s::stream()" expects parameter 1 to be an iterable of TracedResponse objects, "%s" given.', TracingHttpClient::class, get_debug_type($r)));
+                throw new \TypeError(\sprintf('"%s::stream()" expects parameter 1 to be an iterable of TracedResponse objects, "%s" given.', TracingHttpClient::class, get_debug_type($r)));
             }
 
             $traceableMap[$r->response] = $r;
diff --git a/src/Http/TracingHttpClient.php b/src/Http/TracingHttpClient.php
index 0db8472..f6b2c5f 100644
--- a/src/Http/TracingHttpClient.php
+++ b/src/Http/TracingHttpClient.php
@@ -39,9 +39,7 @@ class TracingHttpClient implements HttpClientInterface
      * @param HttpClientInterface|array<mixed>|null $client
      */
     final public function __construct(
-        HttpClientInterface|array $client = null,
-        ClientRequestOperationNameResolverInterface $operationNameResolver = null,
-        ClientRequestAttributeProviderInterface $attributeProvider = null,
+        HttpClientInterface|array|null $client = null, ClientRequestOperationNameResolverInterface|null $operationNameResolver = null, ClientRequestAttributeProviderInterface|null $attributeProvider = null,
         int $maxHostConnections = 6,
         int $maxPendingPushes = 50,
     ) {
@@ -71,7 +69,7 @@ protected function getExtraSpanAttributes(array|null $attributes): array
         }
 
         if (!\is_array($attributes)) {
-            throw new \RuntimeException(sprintf('Extra span attributes must be a comma separated list of attributes or an array. %s given.', get_debug_type($attributes)));
+            throw new \RuntimeException(\sprintf('Extra span attributes must be a comma separated list of attributes or an array. %s given.', get_debug_type($attributes)));
         }
 
         return $attributes;
@@ -91,6 +89,7 @@ protected function getExtraSpanAttributes(array|null $attributes): array
      *         on_response_body_callback?: callable|array<string|object, string>
      *     }
      * } $options
+     *
      * @throws TransportExceptionInterface
      */
     public function request(string $method, string $url, array $options = []): ResponseInterface
@@ -166,7 +165,7 @@ public function request(string $method, string $url, array $options = []): Respo
         return new TracedResponse($this->client->request($method, $url, $options), $span);
     }
 
-    public function stream(ResponseInterface|iterable $responses, float $timeout = null): ResponseStreamInterface
+    public function stream(ResponseInterface|iterable $responses, float|null $timeout = null): ResponseStreamInterface
     {
         if ($responses instanceof ResponseInterface) {
             $responses = [$responses];