FA-62315 / Currency rounding and FX conversion / Member archive

Yen prices receive a decimal .99 charm ending · case 05

Yen shelf prices appear as 1234.99.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

solve(price, rate, ccy): a price list converted at rate is re-priced to the smallest charm price not below the exact converted value raw = price*rate. For JPY, charm prices end in 8 (…8 yen, i.e. 10k-2). For other currencies, charm prices end in .99. Return the charm price as a plain string.

Why this case matters

Currency amounts must be rounded at the right stage and in the right unit, or ledgers, quotes and settlements drift by minor units.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression yen-ending 1	`"19731.99"`	`"19738"`	Failed

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