I tried to keep the same interface as Algorithm::LUHN and others in the checkdigit generation / checking problem domain.
If you don't want to have a collision, use the OO interface (coming Real Soon Now - see issue list), or skip the imports (use Algorithm::Damm ()) and use the fully packaged sub name. You don't even need to skip the imports, as nothing is imported (well, is not supposed to be imported) by default.
I have to mull on this for a bit, but right now I am on the 'leave it alone' side of the fence.
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