Fixed #548

Author: Geolim4

src/phpFastCache/Drivers/Predis/Driver.php

@@ -116,7 +116,7 @@ protected function driverDelete(CacheItemInterface $item): bool
          * Check for Cross-Driver type confusion
          */
         if ($item instanceof Item) {
-            return (bool)$this->instance->del([$item->getKey()]);
+            return (bool) $this->instance->del([$item->getKey()]);
         } else {
             throw new phpFastCacheInvalidArgumentException('Cross-Driver type confusion detected');
         }

src/phpFastCache/Drivers/Redis/Driver.php

@@ -120,7 +120,7 @@ protected function driverDelete(CacheItemInterface $item): bool
          * Check for Cross-Driver type confusion
          */
         if ($item instanceof Item) {
-            return $this->instance->del($item->getKey());
+            return (bool) $this->instance->del($item->getKey());
         } else {
             throw new phpFastCacheInvalidArgumentException('Cross-Driver type confusion detected');
         }