Add EAN addons support (fixes #140)#255

Open

dekoza wants to merge 13 commits intoWhyNotHugo:mainfrom

dekoza:ean_addons_support

Commits on Jan 3, 2026

Fix ISSN - don't throw out digits 11 and 12 when using EAN13 form as they are allowed by ISSN spec (see issn.org).
dekoza
committed
Add EAN-2 and EAN-5 addon support for barcodes based on EAN-13 and EAN-8. FIXES #140
dekoza
committed
Add EAN-2 and EAN-5 addon support for UPC-A (EAN-12) barcodes as per GITN standard.
dekoza
committed
Add scannability (image correctness) tests to ensure proper addon rendering. Fix addon rendering by adding quiet zone.
dekoza
committed
Update docs/getting-started.rst

dekoza
and
Copilot
authored
Update barcode/charsets/ean.py

dekoza
and
Copilot
authored
Fix too opinionated validation of ISBN-13 code starting with 979
dekoza
committed
Refactor duplicated code to a helper module.
dekoza
committed