as you seem to be looking into verification once again, could you please consider to have a look into EAN/gtin validation once more? At the moment we have “Is valid EAN13”, but we would need a more general “is a valid EAN/gtin” as there is no rule that says articles only have EAN13 or Ean8 or whatever (gtin beeing the correct name for the former EAN), so if you have a list of products and want to check the EAN, you might meet all kinds of those, not only EAN13.
Yes, I think so - great. From my experience, EAN-13 is by far the most common, you sometimes get to see EAN-8 or EAN-14, I never consciously met a EAN-12. But I am no expert if there might be other versions that should theoretically be included in the list…