Version 1.03 06/11/06 - Fixed a typo in the documentation for issue_num(). Version 1.02 04/01/02 - Fixed error in test cases of t/04-bad.t. It was looking for the string "not correct" from Algorith::LUHN, which changed it to "incoorect." Test now looks for either string. Version 1.01 03/27/02 - Fixed error() to return undef for valid CUSIP, as documented. Set $ERROR to undef after successful is_valid() call. Version 1.00 11/18/01 - Added the error() method. Version 0.03 05/09/01 - Added t/05-acc.t test. Version 0.02 05/03/01 - Added a lot of validations in is_valid. Added new test t/04-bad.t to check new validations. 05/01/01 - Changed the way the list of A..Z valid_chars is generated to be more explicit.