no need for this check based on input types

Author: dominikzogg

src/Encoder/JsonxTypeEncoder.php

@@ -178,8 +178,6 @@ private function getType(null|array|bool|float|int|string $value): string
             return self::DATATYPE_NUMBER;
         }
 
-        if (null === $value) {
-            return self::DATATYPE_NULL;
-        }
+        return self::DATATYPE_NULL;
     }
 }