Fix styling

.php-cs-fixer.cache

@@ -1 +1 @@
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src/Enum.php

@@ -45,7 +45,7 @@ public function attach($class): static
 
         $this->displayUsing(
             function ($value) use ($class) {
-                if(is_null($value)){
+                if (is_null($value)) {
                     return null;
                 }
                 if ($value instanceof UnitEnum) {