4 ms·

Luhn doesn't catch everything. (It will not detect transposition of the two-digit sequence 09 to 90 (or vice versa) - Wikipedia). But, ok, what about an innoce

by ape4 11y ago

Luhn doesn't catch everything. (It will not detect transposition of the two-digit sequence 09 to 90 (or vice versa) - Wikipedia). But, ok, what about an innocent CCV typo. You need to give real users errors when they make mistakes.