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dsh-checkdigit

Check-digit mathematics toolbox for DeepSeek Harness (dsh): generate, validate and detect check digits for Luhn, Verhoeff, Damm, ISBN-10/13, EAN-8/13, UPC-A, ISIN, CUSIP, IBAN, CAS Registry Number and ABA routing number, plus ISBN-10 <-> ISBN-13 conversion — zero runtime dependencies

TYEclipse2

Bundle

dsh-validate

Offline identifier checks and Chinese money/tax arithmetic. Checksum-verified identifiers (mainland ID, USCC, bank card, plate, VIN, ISBN, IMEI, IBAN, EAN/UPC) plus amount-in-words, IIT, VAT, mortgage schedules and 调休-aware workday counts.

mario03690