Issue with barcode_code39 Base1DBarcode.php

[mathial]

Hi

First, thanks for your great work.
I have an issue with my barcodes. All the "Z" are read as they were "Y", and the "Y" become "Z"...
I'm using the function barcode_code39 of Base1DBarcode.php
So I decided to invert the lines 548 and 549 of the files, in order to switch Y and Z :
$chr['Y'] = '133131111';
$chr['Z'] = '331131111';

And now it works !
Quite strange isn'it ?