Financial Integrity

What problem does it solve?

Financial calculations and revenue tracking must be provably accurate and auditable to prevent floating-point errors and ensure trust in financial reports.

Core Features & Use Cases

• Penny Perfect Rule: enforce integer or high-precision decimal arithmetic for all monetary values.
• Storage Standards: use DECIMAL(19, 4) for unit prices and DECIMAL(19, 2) for final transaction amounts; rely on decimal.js via currency utilities.
• Invariant Testing: apply property-based tests (fast-check) to prove financial laws hold for all inputs.
• Immutability & Audit Trails: maintain append-only financial records with reversal and correction transactions to preserve history.
• Multi-Currency Safety: capture exchange rates at the time of transaction to avoid drift.

Quick Start

Adopt the Penny Perfect rule by using decimal arithmetic and currency utilities for all money calculations.