FA-62129 / Currency rounding and FX conversion / Member archive

Trailing zero fraction digits beyond the exponent are rejected · case 04

'1 234,500' euros is refused although the extra digit is a zero.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

solve(text, locale, exp): parse a localized amount into integer minor units at exponent exp. Group/decimal separators: en ',' '.', de '.' ',', ch "'" '.', fr ' ' or U+202F and ','. An optional leading '-' marks a negative amount (including -0.xx). If grouping is used, the first group has 1-3 digits and every later group exactly 3. A decimal separator must be followed by digits. Fraction digits beyond exp are allowed only if they are zeros, otherwise 'ERR:precision'. Malformed text returns 'ERR:format'; an unknown locale 'ERR:locale'.

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 excess-fraction-zeros 1	`"ERR:precision"`	`-999001`	Failed

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