{"abstract":"'-12.50' parses as -1150 cents and '-0.50' as +50.","category":"Currency rounding and FX conversion","checks":7,"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'.","evaluation_group":"w2-currency_rounding_and_fx_conversion-locale-amount-parsing","failed_approach":"Deriving the sign from the parsed whole part loses it when the whole part is zero.","family":"w2-currency_rounding_and_fx_conversion-locale-amount-parsing-negative-below-one","id":"FA-62116","implementations":{"attempt":{"sha256":"a96896392e7ef0a100695292b8ff471c62972661794ce6202437f104a5bd47fe","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(text, locale, exp):\n    seps = {'en': (',', '.'), 'de': ('.', ','), 'ch': (\"'\", '.'), 'fr': (' \\u202f', ',')}\n    if locale not in seps: return 'ERR:locale'\n    groups, dec = seps[locale]\n    dig = lambda t: t != '' and all(c in '0123456789' for c in t)\n    s = text.strip()\n    neg = s.startswith('-')\n    if neg: s = s[1:]\n    whole, _, frac = s.partition(dec)\n    for g in groups[1:]: whole = whole.replace(g, groups[0])\n    parts = whole.split(groups[0])\n    if not all(dig(p) for p in parts) or (dec in s and not dig(frac)): return 'ERR:format'\n    if len(parts) > 1 and (len(parts[0]) > 3 or any(len(p) != 3 for p in parts[1:])): return 'ERR:format'\n    if frac[exp:].strip('0'): return 'ERR:precision'\n    frac = frac[:exp].ljust(exp, '0')\n    m = int(('-' if neg else '') + ''.join(parts))\n    v = m * 10 ** exp + ((-1 if m < 0 else 1) * int(frac) if frac else 0)\n    return v\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('regression negative-below-one 1', ('-0,50', 'de', 2), -50),\n  ('regression negative-below-one 2', ('-12.50', 'en', 2), -1250), ('partial repair guard 2', ('-0,500', 'fr', 2), -50),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456),\n  ('control: german short fraction', ('1.234,5', 'de', 2), 123450),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision')],\n [('regression negative-below-one 1', ('-12.05', 'en', 2), -1205),\n  ('regression negative-below-one 2', ('-0,500', 'fr', 2), -50), ('partial repair guard 1', ('-0.1', 'ch', 3), -100),\n  ('partial repair guard 2', ('-0,5', 'de', 2), -50),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision'),\n  ('control: bad grouping', ('1,23,4.00', 'en', 2), 'ERR:format'),\n  ('control: dinar fraction', ('12.5', 'en', 3), 12500)],\n [('regression negative-below-one 1', ('-12345,500', 'de', 3), -12345500),\n  ('regression negative-below-one 2', ('-12.345,1', 'de', 2), -1234510),\n  ('partial repair guard 1', ('-0.1', 'en', 2), -10), ('partial repair guard 2', ('-0.1', 'en', 3), -100),\n  ('control: dinar fraction', ('12.5', 'en', 3), 12500), ('control: swiss integer', (\"1'000\", 'ch', 0), 1000),\n  ('control: french plain space', ('12 345,6', 'fr', 2), 1234560),\n  ('control: dangling separator', ('12.', 'en', 2), 'ERR:format')],\n [('regression negative-below-one 1', ('-999,50', 'fr', 3), -999500),\n  ('regression negative-below-one 2', ('-12\\u202f345,05', 'fr', 2), -1234505),\n  ('partial repair guard 1', ('-0,500', 'de', 3), -500), ('partial repair guard 2', ('-0.1', 'ch', 2), -10),\n  ('control: dangling separator', ('12.', 'en', 2), 'ERR:format'),\n  ('control: unknown locale', ('12', 'it', 2), 'ERR:locale'),\n  ('control: oversized first group', ('1234,567.00', 'en', 2), 'ERR:format'),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456)],\n [('regression negative-below-one 1', ('-0.1', 'ch', 3), -100),\n  ('regression negative-below-one 2', ('-1000.1', 'ch', 2), -100010),\n  ('partial repair guard 1', ('-0,05', 'de', 3), -50), ('partial repair guard 2', ('-0,50', 'de', 2), -50),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456),\n  ('control: german short fraction', ('1.234,5', 'de', 2), 123450),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision')]]\nfor label, args, expected in cases[N - 1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"4dd476b55092ea1a7cd1556cd644655c6e237332cd49ee2ff184915650ae0634","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(text, locale, exp):\n    seps = {'en': (',', '.'), 'de': ('.', ','), 'ch': (\"'\", '.'), 'fr': (' \\u202f', ',')}\n    if locale not in seps: return 'ERR:locale'\n    groups, dec = seps[locale]\n    dig = lambda t: t != '' and all(c in '0123456789' for c in t)\n    s = text.strip()\n    neg = s.startswith('-')\n    if neg: s = s[1:]\n    whole, _, frac = s.partition(dec)\n    for g in groups[1:]: whole = whole.replace(g, groups[0])\n    parts = whole.split(groups[0])\n    if not all(dig(p) for p in parts) or (dec in s and not dig(frac)): return 'ERR:format'\n    if len(parts) > 1 and (len(parts[0]) > 3 or any(len(p) != 3 for p in parts[1:])): return 'ERR:format'\n    if frac[exp:].strip('0'): return 'ERR:precision'\n    frac = frac[:exp].ljust(exp, '0')\n    v = (-1 if neg else 1) * int(''.join(parts)) * 10 ** exp + (int(frac) if frac else 0)\n    return v\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('regression negative-below-one 1', ('-0,50', 'de', 2), -50),\n  ('regression negative-below-one 2', ('-12.50', 'en', 2), -1250), ('partial repair guard 2', ('-0,500', 'fr', 2), -50),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456),\n  ('control: german short fraction', ('1.234,5', 'de', 2), 123450),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision')],\n [('regression negative-below-one 1', ('-12.05', 'en', 2), -1205),\n  ('regression negative-below-one 2', ('-0,500', 'fr', 2), -50), ('partial repair guard 1', ('-0.1', 'ch', 3), -100),\n  ('partial repair guard 2', ('-0,5', 'de', 2), -50),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision'),\n  ('control: bad grouping', ('1,23,4.00', 'en', 2), 'ERR:format'),\n  ('control: dinar fraction', ('12.5', 'en', 3), 12500)],\n [('regression negative-below-one 1', ('-12345,500', 'de', 3), -12345500),\n  ('regression negative-below-one 2', ('-12.345,1', 'de', 2), -1234510),\n  ('partial repair guard 1', ('-0.1', 'en', 2), -10), ('partial repair guard 2', ('-0.1', 'en', 3), -100),\n  ('control: dinar fraction', ('12.5', 'en', 3), 12500), ('control: swiss integer', (\"1'000\", 'ch', 0), 1000),\n  ('control: french plain space', ('12 345,6', 'fr', 2), 1234560),\n  ('control: dangling separator', ('12.', 'en', 2), 'ERR:format')],\n [('regression negative-below-one 1', ('-999,50', 'fr', 3), -999500),\n  ('regression negative-below-one 2', ('-12\\u202f345,05', 'fr', 2), -1234505),\n  ('partial repair guard 1', ('-0,500', 'de', 3), -500), ('partial repair guard 2', ('-0.1', 'ch', 2), -10),\n  ('control: dangling separator', ('12.', 'en', 2), 'ERR:format'),\n  ('control: unknown locale', ('12', 'it', 2), 'ERR:locale'),\n  ('control: oversized first group', ('1234,567.00', 'en', 2), 'ERR:format'),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456)],\n [('regression negative-below-one 1', ('-0.1', 'ch', 3), -100),\n  ('regression negative-below-one 2', ('-1000.1', 'ch', 2), -100010),\n  ('partial repair guard 1', ('-0,05', 'de', 3), -50), ('partial repair guard 2', ('-0,50', 'de', 2), -50),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456),\n  ('control: german short fraction', ('1.234,5', 'de', 2), 123450),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision')]]\nfor label, args, expected in cases[N - 1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"3856b5a49621d7eac78512b341740e1f4519bc971ad52335ee671b2008fa06db","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(text, locale, exp):\n    seps = {'en': (',', '.'), 'de': ('.', ','), 'ch': (\"'\", '.'), 'fr': (' \\u202f', ',')}\n    if locale not in seps: return 'ERR:locale'\n    groups, dec = seps[locale]\n    dig = lambda t: t != '' and all(c in '0123456789' for c in t)\n    s = text.strip()\n    neg = s.startswith('-')\n    if neg: s = s[1:]\n    whole, _, frac = s.partition(dec)\n    for g in groups[1:]: whole = whole.replace(g, groups[0])\n    parts = whole.split(groups[0])\n    if not all(dig(p) for p in parts) or (dec in s and not dig(frac)): return 'ERR:format'\n    if len(parts) > 1 and (len(parts[0]) > 3 or any(len(p) != 3 for p in parts[1:])): return 'ERR:format'\n    if frac[exp:].strip('0'): return 'ERR:precision'\n    frac = frac[:exp].ljust(exp, '0')\n    v = int(''.join(parts)) * 10 ** exp + (int(frac) if frac else 0)\n    return -v if neg else v\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('regression negative-below-one 1', ('-0,50', 'de', 2), -50),\n  ('regression negative-below-one 2', ('-12.50', 'en', 2), -1250), ('partial repair guard 2', ('-0,500', 'fr', 2), -50),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456),\n  ('control: german short fraction', ('1.234,5', 'de', 2), 123450),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision')],\n [('regression negative-below-one 1', ('-12.05', 'en', 2), -1205),\n  ('regression negative-below-one 2', ('-0,500', 'fr', 2), -50), ('partial repair guard 1', ('-0.1', 'ch', 3), -100),\n  ('partial repair guard 2', ('-0,5', 'de', 2), -50),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision'),\n  ('control: bad grouping', ('1,23,4.00', 'en', 2), 'ERR:format'),\n  ('control: dinar fraction', ('12.5', 'en', 3), 12500)],\n [('regression negative-below-one 1', ('-12345,500', 'de', 3), -12345500),\n  ('regression negative-below-one 2', ('-12.345,1', 'de', 2), -1234510),\n  ('partial repair guard 1', ('-0.1', 'en', 2), -10), ('partial repair guard 2', ('-0.1', 'en', 3), -100),\n  ('control: dinar fraction', ('12.5', 'en', 3), 12500), ('control: swiss integer', (\"1'000\", 'ch', 0), 1000),\n  ('control: french plain space', ('12 345,6', 'fr', 2), 1234560),\n  ('control: dangling separator', ('12.', 'en', 2), 'ERR:format')],\n [('regression negative-below-one 1', ('-999,50', 'fr', 3), -999500),\n  ('regression negative-below-one 2', ('-12\\u202f345,05', 'fr', 2), -1234505),\n  ('partial repair guard 1', ('-0,500', 'de', 3), -500), ('partial repair guard 2', ('-0.1', 'ch', 2), -10),\n  ('control: dangling separator', ('12.', 'en', 2), 'ERR:format'),\n  ('control: unknown locale', ('12', 'it', 2), 'ERR:locale'),\n  ('control: oversized first group', ('1234,567.00', 'en', 2), 'ERR:format'),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456)],\n [('regression negative-below-one 1', ('-0.1', 'ch', 3), -100),\n  ('regression negative-below-one 2', ('-1000.1', 'ch', 2), -100010),\n  ('partial repair guard 1', ('-0,05', 'de', 3), -50), ('partial repair guard 2', ('-0,50', 'de', 2), -50),\n  ('control: english grouping', ('1,234.56', 'en', 2), 123456),\n  ('control: german short fraction', ('1.234,5', 'de', 2), 123450),\n  ('control: narrow space with trailing zero', ('1\\u202f234,500', 'fr', 2), 123450),\n  ('control: excess precision', ('12.345', 'en', 2), 'ERR:precision')]]\nfor label, args, expected in cases[N - 1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic, bounded teaching model with a stipulated toy contract; it makes no claim of conformance to any real regulation, standard, or institution's rules. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-currency_rounding_and_fx_conversion-locale-amount-parsing-negative-below-one","generated_at":"2026-09-29T14:47:01.682038+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Currency amounts must be rounded at the right stage and in the right unit, or ledgers, quotes and settlements drift by minor units.","repair":"Parse the magnitude, then negate the whole minor-unit value.","root_cause":"The minus sign multiplies only the integer part before the fraction is added.","sha256":"6fa3169f328c020d7ada860f0713f617bce71ac0b4edffc54f8f653c22a635c1","title":"The sign of a negative amount is applied only to the whole-unit part · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":41.715,"exit_code":1,"observations":[{"actual":50,"check":"regression negative-below-one 1","expected":-50,"passed":false},{"actual":-1250,"check":"regression negative-below-one 2","expected":-1250,"passed":true},{"actual":50,"check":"partial repair guard 2","expected":-50,"passed":false},{"actual":123456,"check":"control: english grouping","expected":123456,"passed":true},{"actual":123450,"check":"control: german short fraction","expected":123450,"passed":true},{"actual":123450,"check":"control: narrow space with trailing zero","expected":123450,"passed":true},{"actual":"ERR:precision","check":"control: excess precision","expected":"ERR:precision","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression negative-below-one 1\", \"actual\": 50, \"expected\": -50, \"passed\": false}, {\"check\": \"regression negative-below-one 2\", \"actual\": -1250, \"expected\": -1250, \"passed\": true}, {\"check\": \"partial repair guard 2\", \"actual\": 50, \"expected\": -50, \"passed\": false}, {\"check\": \"control: english grouping\", \"actual\": 123456, \"expected\": 123456, \"passed\": true}, {\"check\": \"control: german short fraction\", \"actual\": 123450, \"expected\": 123450, \"passed\": true}, {\"check\": \"control: narrow space with trailing zero\", \"actual\": 123450, \"expected\": 123450, \"passed\": true}, {\"check\": \"control: excess precision\", \"actual\": \"ERR:precision\", \"expected\": \"ERR:precision\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.365,"exit_code":1,"observations":[{"actual":50,"check":"regression negative-below-one 1","expected":-50,"passed":false},{"actual":-1150,"check":"regression negative-below-one 2","expected":-1250,"passed":false},{"actual":50,"check":"partial repair guard 2","expected":-50,"passed":false},{"actual":123456,"check":"control: english grouping","expected":123456,"passed":true},{"actual":123450,"check":"control: german short fraction","expected":123450,"passed":true},{"actual":123450,"check":"control: narrow space with trailing zero","expected":123450,"passed":true},{"actual":"ERR:precision","check":"control: excess precision","expected":"ERR:precision","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression negative-below-one 1\", \"actual\": 50, \"expected\": -50, \"passed\": false}, {\"check\": \"regression negative-below-one 2\", \"actual\": -1150, \"expected\": -1250, \"passed\": false}, {\"check\": \"partial repair guard 2\", \"actual\": 50, \"expected\": -50, \"passed\": false}, {\"check\": \"control: english grouping\", \"actual\": 123456, \"expected\": 123456, \"passed\": true}, {\"check\": \"control: german short fraction\", \"actual\": 123450, \"expected\": 123450, \"passed\": true}, {\"check\": \"control: narrow space with trailing zero\", \"actual\": 123450, \"expected\": 123450, \"passed\": true}, {\"check\": \"control: excess precision\", \"actual\": \"ERR:precision\", \"expected\": \"ERR:precision\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.855,"exit_code":0,"observations":[{"actual":-50,"check":"regression negative-below-one 1","expected":-50,"passed":true},{"actual":-1250,"check":"regression negative-below-one 2","expected":-1250,"passed":true},{"actual":-50,"check":"partial repair guard 2","expected":-50,"passed":true},{"actual":123456,"check":"control: english grouping","expected":123456,"passed":true},{"actual":123450,"check":"control: german short fraction","expected":123450,"passed":true},{"actual":123450,"check":"control: narrow space with trailing zero","expected":123450,"passed":true},{"actual":"ERR:precision","check":"control: excess precision","expected":"ERR:precision","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression negative-below-one 1\", \"actual\": -50, \"expected\": -50, \"passed\": true}, {\"check\": \"regression negative-below-one 2\", \"actual\": -1250, \"expected\": -1250, \"passed\": true}, {\"check\": \"partial repair guard 2\", \"actual\": -50, \"expected\": -50, \"passed\": true}, {\"check\": \"control: english grouping\", \"actual\": 123456, \"expected\": 123456, \"passed\": true}, {\"check\": \"control: german short fraction\", \"actual\": 123450, \"expected\": 123450, \"passed\": true}, {\"check\": \"control: narrow space with trailing zero\", \"actual\": 123450, \"expected\": 123450, \"passed\": true}, {\"check\": \"control: excess precision\", \"actual\": \"ERR:precision\", \"expected\": \"ERR:precision\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}