note ikegami <p>Your original beef was that you couldn't use [mod://Business::CreditCard] for [mod://Authen::PIN]. You accepted that "Authn::PIN probably shouldn't use this module for a general-purpose LUHN implementation." <p>But then it became a question of whether <c>validate</c> should obey ISO-7812 or follow real-world practices. Do you even have any stake is this? I mean, do you even use the module? It sounds to me you like you found a "problem" in a module you don't even use. I suspect the <c>validate</c> is almost exclusively used to verify a credit card number before initiating a transaction. Anyone using it for that purpose would welcome the cut in false-positives that checking for a minimum length of 13 digits provides. <p>If you do use this module, and this check is causing a problem, you should be discussing that problem. If problems or false-negatives occur, the author is willing to re-open the issue: "Feel free to re-open this bug if verify() doesn't work with any real-world credit card number." 640142 640142