Update Driver.php

解决写入类型是数字，读出是数字字符串问题

Author: walkor

src/Driver.php

@@ -233,10 +233,6 @@ public function getTagKey(string $tag): string
      */
     protected function serialize($data): string
     {
-        if (is_numeric($data)) {
-            return (string) $data;
-        }
-
         $serialize = $this->options['serialize'][0] ?? "serialize";
 
         return $serialize($data);