[RateLimiter] Add typecase to SlidingWindow::getExpirationTime

Author: georgringer

src/Symfony/Component/RateLimiter/Policy/SlidingWindow.php

@@ -76,7 +76,7 @@ public function getId(): string
      */
     public function getExpirationTime(): int
     {
-        return $this->windowEndAt + $this->intervalInSeconds - microtime(true);
+        return (int) ($this->windowEndAt + $this->intervalInSeconds - microtime(true));
     }
 
     public function isExpired(): bool

src/Symfony/Component/RateLimiter/Tests/Policy/SlidingWindowTest.php

@@ -34,6 +34,9 @@ public function testGetExpirationTime()
 
         $new = SlidingWindow::createFromPreviousWindow($cachedWindow, 15);
         $this->assertSame(2 * 15, $new->getExpirationTime());
+
+        usleep(10.1);
+        $this->assertIsInt($new->getExpirationTime());
     }
 
     public function testInvalidInterval()