Minor cleanup

src/Deferred.php

@@ -13,16 +13,34 @@
  */
 final class Deferred implements Promise
 {
+    /**
+     * @var ResponseInterface|null
+     */
     private $value;
 
+    /**
+     * @var Exception|null
+     */
     private $failure;
 
+    /**
+     * @var string
+     */
     private $state;
 
+    /**
+     * @var callable
+     */
     private $waitCallback;
 
+    /**
+     * @var callable[]
+     */
     private $onFulfilledCallbacks;
 
+    /**
+     * @var callable[]
+     */
     private $onRejectedCallbacks;
 
     public function __construct(callable $waitCallback)
@@ -81,12 +99,12 @@ public function getState(): string
      */
     public function resolve(ResponseInterface $response): void
     {
-        if (self::PENDING !== $this->state) {
+        if (Promise::PENDING !== $this->state) {
             return;
         }
 
         $this->value = $response;
-        $this->state = self::FULFILLED;
+        $this->state = Promise::FULFILLED;
 
         foreach ($this->onFulfilledCallbacks as $onFulfilledCallback) {
             $onFulfilledCallback($response);
@@ -98,12 +116,12 @@ public function resolve(ResponseInterface $response): void
      */
     public function reject(Exception $exception): void
     {
-        if (self::PENDING !== $this->state) {
+        if (Promise::PENDING !== $this->state) {
             return;
         }
 
         $this->failure = $exception;
-        $this->state = self::REJECTED;
+        $this->state = Promise::REJECTED;
 
         foreach ($this->onRejectedCallbacks as $onRejectedCallback) {
             $onRejectedCallback($exception);
@@ -115,16 +133,16 @@ public function reject(Exception $exception): void
      */
     public function wait($unwrap = true)
     {
-        if (self::PENDING === $this->state) {
+        if (Promise::PENDING === $this->state) {
             $callback = $this->waitCallback;
             $callback();
         }
 
         if (!$unwrap) {
-            return;
+            return null;
         }
 
-        if (self::FULFILLED === $this->state) {
+        if (Promise::FULFILLED === $this->state) {
             return $this->value;
         }
 

src/HttpClientPool/HttpClientPoolItem.php

@@ -57,7 +57,7 @@ class HttpClientPoolItem implements HttpClient, HttpAsyncClient
      * @param ClientInterface|HttpAsyncClient $client
      * @param int|null                        $reenableAfter Number of seconds until this client is enabled again after an error
      */
-    public function __construct($client, $reenableAfter = null)
+    public function __construct($client, int $reenableAfter = null)
     {
         $this->client = new FlexibleHttpClient($client);
         $this->reenableAfter = $reenableAfter;