[split] Database problem since 3.1.6

Hello, thanks for You work.
I'm use

PHP Code:

$this->dbutil->backup 


for backup DB from admin panel. After upgrade, in this a peace of code

PHP Code:

while ($field = $query->result_id->fetch_field())
 {
 // Most versions of MySQL store timestamp as a string
 $is_int[$i] = ($field->type & MYSQLI_TYPE_TINY)
 OR ($field->type & MYSQLI_TYPE_SHORT)
 OR ($field->type & MYSQLI_TYPE_INT24)
 OR ($field->type & MYSQLI_TYPE_LONG)
 OR ($field->type & MYSQLI_TYPE_LONGLONG);

 // Create a string of field names
 $field_str .= $this->db->escape_identifiers($field->name).', ';
 $i++;
 } 


returned field type integer, but in DB table this field is varchar.

Method _backup from CI_DB_mysqli_utility class return wrong data without escape string field

https://github.com/bcit-ci/CodeIgniter/issues/5276