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During the works on HV-809 it turned out that apparently two different check digit algorithms exist which are referred to as "Mod 10" check:
* [Luhn algorithm|http://en.wikipedia.org/wiki/Luhn_algorithm]
* Other Mod10 checks such as [ISBN-13|http://www.activebarcode.com/codes/checkdigit/modulo10.html]
The difference is how products calculated for the individual numbers are handled. In the Luhn algorithm, 9 is subtracted when such a product is larger than 9, in the other algorithms these products are taken as is.
We may add another option to {{@Mod10}} allowing to configure this behavior. Alternatively, another dedicated constraint could be implemented.
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