Fix bucket size reduce when previously created with bigger size

Author: Orkin

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

@@ -67,6 +67,10 @@ public function reserve(int $tokens = 1, ?float $maxTime = null): Reservation
             $now = microtime(true);
             $availableTokens = $bucket->getAvailableTokens($now);
 
+            if ($availableTokens > $this->maxBurst) {
+                $availableTokens = $this->maxBurst;
+            }
+
             if ($availableTokens >= $tokens) {
                 // tokens are now available, update bucket
                 $bucket->setTokens($availableTokens - $tokens);

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

@@ -56,6 +56,18 @@ public function testReserveMoreTokensThanBucketSize()
         $limiter->reserve(15);
     }
 
+    public function testReduceBucketSizeWhenAlreadyExistInStorageWithBiggerBucketSize()
+    {
+        $limiter = $this->createLimiter(100);
+
+        $limiter->consume();
+
+        $limiter2 = $this->createLimiter(1);
+        $limiter2->consume();
+
+        $this->assertFalse($limiter2->consume()->isAccepted());
+    }
+
     public function testReserveMaxWaitingTime()
     {
         $this->expectException(MaxWaitDurationExceededException::class);