FA-60783 / Loyalty points ledgers / Member archive

Points plus cash split: negative room guard · case 03

When the price is below the minimum cash the member is credited points and charged more than the price.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Input {price, balance, cpp10 (point value in tenths of a cent), min_cash}. Points may cover at most price - min_cash (never negative): max points = floor((price - min_cash)*10/cpp10), limited by balance. Credit = floor(points*cpp10/10); cash = price - credit. Return {points, cash}.

Why this case matters

Member point balances, statements and the program liability depend on this ledger rule.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
price below minimum cash	`{"cash": 403, "points": -103}`	`{"cash": 300, "points": 0}`	Failed

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