I spent several hours fiddling with z3 to figure out this check digit algorithm, only to come up empty.
Weeks later, I find documentation on it – turns out, it's recursive so the whole assumption it'd just be a set of fixed weights was wrong from the start and it was hopeless to begin with.
At least now I know, at last I can sleep in peace.
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rqsd (rqsd@borg.social)'s status on Friday, 30-Dec-2022 21:53:34 JST rqsd