Description:
------------
When I select char field in my database, it's returned with a size equivalent of storage bytes size.
For utf8 char(3) return String length is 12. (3 char * 4bytes = 12)



Test script:
---------------
SQL :
CREATE TABLE COMMERCIAUX (
  ACTIF CHAR(3) CHARACTER SET 'UTF8'
);
INSERT INTO COMMERCIAUX(ACTIF) VALUES ('Oui');

<?php

$connection = new PDO('firebird:dbname=localhost/3050:MIASERVER;charset=utf8;encoding=UTF8', 'SYSDBA', 'masterkey');
$stmt = $connection->query('SELECT actif FROM commerciaux');
$result = $stmt->fetchAll();

?>


Expected result:
----------------
     [
       "ACTIF" => "Oui",
       0 => "Oui",
     ],
     [
       "ACTIF" => "Oui",
       0 => "Oui",
     ],
     [
       "ACTIF" => "Non",
       0 => "Non",
     ],

Actual result:
--------------
You can see they spaces after text
     [
       "ACTIF" => "Oui         ",
       0 => "Oui         ",
     ],
     [
       "ACTIF" => "Oui         ",
       0 => "Oui         ",
     ],
     [
       "ACTIF" => "Non         ",
       0 => "Non         ",
     ],