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subject > locale-dependent feature > credit card number format
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credit card number format
subjectfact 
credit card number formathas localization issues
  • You should almost never require a specific format for these items since they differ so widely and can change at any time
  • Allow free-form input of whatever the user wants to type
2001-08-30 14:55:08.0
is a subtopic of 7.5 - Usability Principles2001-08-30 14:55:08.0
is a kind of locale-dependent feature2001-08-30 14:55:08.0