fix: correct expected type in MemcachedHandlerTest::testDecrement

Author: mdalikadar

tests/system/Cache/Handlers/MemcachedHandlerTest.php

@@ -154,7 +154,9 @@ public function testDecrement(): void
         // A key that doesn't exist yet starts at 0, not at the offset
         // (Memcached counters are unsigned, so it can't start negative).
         $this->assertSame(0, $memcachedHandler->decrement(self::$key3, 5));
-        $this->assertSame(0, $memcachedHandler->get(self::$key3));
+        // Memcached stores counter values as decimal strings on the wire, so
+        // a plain get() on a counter key returns a string, not an int.
+        $this->assertSame('0', $memcachedHandler->get(self::$key3));
     }
 
     public function testClean(): void