JCB credit card validation could be 15 digits long

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The JCB credit card validation is not right. JCB could be 15, 16 digits long. So the file
Zend/Validator/CreditCard.php should be modified on line 87:

  self::JCB              => array(16),

and be replaced with the following:

  self::JCB              => array(15, 16),

Also the prefixes 2131, 1800 corresponding to the 15 digits credit cards must be added. Just update line 111:

        self::JCB              => array('3528', '3529', '353', '354', '355', '356', '357', '358'),

Adding the new prefixes:

        self::JCB              => array('2131', '1800', '3528', '3529', '353', '354', '355', '356', '357', '358'),