Hi @unho,

Thanks for providing this and sorry for taking so long to merge it. It is merged with a few clean-ups as dd22123.

I also implemented check digit validation in d332ee1 It was quite easy once I saw the pattern in a few of the test numbers you provided. For example, there were two numbers that only differed in one digit but still valid. The difference between the differing digits was 5 which shouldn't happen if you do modulo 11 so I assumed it was modulo 10 and the weight for that digit was 2. Playing around a bit resulted in the alternating 1 and 2 weights.

There were only 3 numbers from the original test set that did not match the check digit algorithm and I confirmed on https://e-ninea.ansd.sn/search_annuaire that these were indeed invalid numbers.