Using standard number types for money in FinTech can cause major financial errors

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FinTech applications handling money often incorrectly use standard floating-point numbers, which can't precisely represent decimal values like 0.1. This leads to small calculation errors that compound into significant financial discrepancies in high-volume systems. Proper financial software requires integer-based sub-unit scaling and strict currency type safety. The article advocates for using ISO 4217 currency codes and immutable value objects in TypeScript to prevent these costly errors.

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