Revert "fix: Implicit numeric conversion when generating id in normal…

… mode (#21)" (#26)

This reverts commit 1b67ae4.

src/Client.php

@@ -109,7 +109,7 @@ private function normalRandom($size)
     {
         $id = '';
         while (1 <= $size--) {
-            $rand = intval(mt_rand()/(mt_getrandmax() + 1));
+            $rand = mt_rand()/(mt_getrandmax() + 1);
             $id .= $this->alphabet[$rand*64 | 0];
         }