Description:
------------
MySQL type 'bit' is fetched as unexpected string. Works correctly in PHP < 7.2

Test script:
---------------
<?php

$db = new PDO('mysql:dbname=test', 'root', '123');

$db->query('CREATE TABLE tbl (`bit` bit(1)) ENGINE=InnoDB');
$db->query('INSERT INTO tbl (`bit`) VALUES (1)');

var_dump($db->query('SELECT * FROM tbl')->fetchAll());

Expected result:
----------------
array(1) {
  [0]=>
  array(2) {
    ["bit"]=>
    string(1) "1"
   }
}

Actual result:
--------------
array(1) {
  [0]=>
  array(2) {
    ["bit"]=>
    string(19) "8220976629027962881"
  }
}