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Validate, normalize, parse, convert, generate, classify, and repair securities identifiers. Auto-detect identifier type from any string. Calculate and restore checksums. Suggest confidence-ranked corrections for fat-fingered or OCR-mangled identifiers. Generate format-valid identifiers as test fixtures. Decode CFI codes to full ISO 10962:2021 classifications. Includes an opt-in ActiveModel/Rails validator that adds no runtime dependency. Supports ISIN, CUSIP, CEI, SEDOL, FIGI, LEI, IBAN, CIK, OCC, WKN, Valoren, CFI, FISN, BIC, DTI, and UPI.
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