FAILURE MAP
← Case archive

FA-56421 / Auction allocation rules / Open access

Amendment priority: lot immutability · case 01

An order replacement switches the auction lot while retaining its identity.

Verified by executionVariant 1 · 12 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

An order replacement switches the auction lot while retaining its identity.

VERIFIED REPAIR

Reject lot migration through amendment even before a fill.

Unsuccessful approach: The attempted repair uses x["old_lot"]==x["new_lot"] or x["filled"]==0; the explicit regression cases demonstrate that this still violates the stipulated auction rule.

Case contract

A single auction order amendment tracks filled units, original queue stamp and an incoming replacement. Price change or size increase loses queue priority; reducing total size cannot erase existing fills. A cancel acknowledgment terminates remaining quantity. Integer stamps and quantities are nonnegative. Named decision lot-immutability: Reject lot migration through amendment even before a fill.

Why this case matters

Offline administrative auction model for software failure analysis.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    v0 = x["now"] if x["new_total"]>x["total"] else x["stamp"]
    v1 = x["now"] if x["new_price"]!=x["old_price"] else x["stamp"]
    v2 = max(x["filled"],x["new_total"])
    v3 = max(0,x["new_total"]-x["filled"])
    v4 = 0 if x["cancel"] and x["ack"] else max(0,x["total"]-x["filled"])
    v5 = x["expected"]==x["revision"]
    v6 = True
    v7 = x["old_owner"]==x["new_owner"]
    v8 = not x["frozen"] or (x["new_price"]==x["old_price"] and x["new_total"]<=x["total"])
    v9 = x["revision"] if x["request_id"]==x["last_id"] else x["revision"]+1
    return {'increase-priority':v0,'price-priority':v1,'filled-floor':v2,'remaining-recalculation':v3,'cancel-ack-gate':v4,'revision-compare':v5,'lot-immutability':v6,'owner-immutability':v7,'freeze-restriction':v8,'request-replay':v9}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [('wrong immutable fields', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('lower price / wrong immutable fields', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('wrong immutable fields / unfilled unchanged', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 8, 'filled': 0, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('normal contract', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('lower price', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('unrelated acknowledgment', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('future revision', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 3, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('no collateral held', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 0, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('price replacement', {'old_price': 10, 'new_price': 12, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('size increase', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 12, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('below executed size', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('acknowledged cancel', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': True, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True])]
def vary(value):
 if type(value) is int: return value*N
 if isinstance(value,list): return [vary(v) for v in value]
 if isinstance(value,dict): return {k:(v if k in ['count', 'delivery_index', 'disputed', 'maximum_set', 'minimum_set', 'stage', 'threshold', 'waived'] else vary(v)) for k,v in value.items()}
 return value
for label, request, expected in fixtures:
 check(label, solve(vary(request))['lot-immutability'], expected[N-1])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
wrong immutable fieldsTrueFalseFailed
lower price / wrong immutable fieldsTrueFalseFailed
wrong immutable fields / unfilled unchangedTrueFalseFailed
normal contractTrueTruePassed
lower priceTrueTruePassed
unrelated acknowledgmentTrueTruePassed
future revisionTrueTruePassed
no collateral heldTrueTruePassed
price replacementTrueTruePassed
size increaseTrueTruePassed
below executed sizeTrueTruePassed
acknowledged cancelTrueTruePassed

SHA-256 / 27c94ec9473c5d822b00924fe5602c5237a0721144ce858ccfa0fbe3bacbe1d4

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    v0 = x["now"] if x["new_total"]>x["total"] else x["stamp"]
    v1 = x["now"] if x["new_price"]!=x["old_price"] else x["stamp"]
    v2 = max(x["filled"],x["new_total"])
    v3 = max(0,x["new_total"]-x["filled"])
    v4 = 0 if x["cancel"] and x["ack"] else max(0,x["total"]-x["filled"])
    v5 = x["expected"]==x["revision"]
    v6 = x["old_lot"]==x["new_lot"] or x["filled"]==0
    v7 = x["old_owner"]==x["new_owner"]
    v8 = not x["frozen"] or (x["new_price"]==x["old_price"] and x["new_total"]<=x["total"])
    v9 = x["revision"] if x["request_id"]==x["last_id"] else x["revision"]+1
    return {'increase-priority':v0,'price-priority':v1,'filled-floor':v2,'remaining-recalculation':v3,'cancel-ack-gate':v4,'revision-compare':v5,'lot-immutability':v6,'owner-immutability':v7,'freeze-restriction':v8,'request-replay':v9}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [('wrong immutable fields', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('lower price / wrong immutable fields', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('wrong immutable fields / unfilled unchanged', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 8, 'filled': 0, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('normal contract', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('lower price', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('unrelated acknowledgment', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('future revision', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 3, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('no collateral held', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 0, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('price replacement', {'old_price': 10, 'new_price': 12, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('size increase', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 12, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('below executed size', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('acknowledged cancel', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': True, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True])]
def vary(value):
 if type(value) is int: return value*N
 if isinstance(value,list): return [vary(v) for v in value]
 if isinstance(value,dict): return {k:(v if k in ['count', 'delivery_index', 'disputed', 'maximum_set', 'minimum_set', 'stage', 'threshold', 'waived'] else vary(v)) for k,v in value.items()}
 return value
for label, request, expected in fixtures:
 check(label, solve(vary(request))['lot-immutability'], expected[N-1])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
wrong immutable fieldsFalseFalsePassed
lower price / wrong immutable fieldsFalseFalsePassed
wrong immutable fields / unfilled unchangedTrueFalseFailed
normal contractTrueTruePassed
lower priceTrueTruePassed
unrelated acknowledgmentTrueTruePassed
future revisionTrueTruePassed
no collateral heldTrueTruePassed
price replacementTrueTruePassed
size increaseTrueTruePassed
below executed sizeTrueTruePassed
acknowledged cancelTrueTruePassed

SHA-256 / a37b1cbaf31380fcb6363dda973d7baf2e0ba0bc04433b86c9dad02b16857023

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    v0 = x["now"] if x["new_total"]>x["total"] else x["stamp"]
    v1 = x["now"] if x["new_price"]!=x["old_price"] else x["stamp"]
    v2 = max(x["filled"],x["new_total"])
    v3 = max(0,x["new_total"]-x["filled"])
    v4 = 0 if x["cancel"] and x["ack"] else max(0,x["total"]-x["filled"])
    v5 = x["expected"]==x["revision"]
    v6 = x["old_lot"]==x["new_lot"]
    v7 = x["old_owner"]==x["new_owner"]
    v8 = not x["frozen"] or (x["new_price"]==x["old_price"] and x["new_total"]<=x["total"])
    v9 = x["revision"] if x["request_id"]==x["last_id"] else x["revision"]+1
    return {'increase-priority':v0,'price-priority':v1,'filled-floor':v2,'remaining-recalculation':v3,'cancel-ack-gate':v4,'revision-compare':v5,'lot-immutability':v6,'owner-immutability':v7,'freeze-restriction':v8,'request-replay':v9}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [('wrong immutable fields', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('lower price / wrong immutable fields', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('wrong immutable fields / unfilled unchanged', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 8, 'filled': 0, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'B', 'old_owner': 'a', 'new_owner': 'b', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [False, False, False, False, False]), ('normal contract', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('lower price', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('unrelated acknowledgment', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('future revision', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 3, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('no collateral held', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 0, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('price replacement', {'old_price': 10, 'new_price': 12, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('size increase', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 12, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('below executed size', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True]), ('acknowledged cancel', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': True, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [True, True, True, True, True])]
def vary(value):
 if type(value) is int: return value*N
 if isinstance(value,list): return [vary(v) for v in value]
 if isinstance(value,dict): return {k:(v if k in ['count', 'delivery_index', 'disputed', 'maximum_set', 'minimum_set', 'stage', 'threshold', 'waived'] else vary(v)) for k,v in value.items()}
 return value
for label, request, expected in fixtures:
 check(label, solve(vary(request))['lot-immutability'], expected[N-1])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
wrong immutable fieldsFalseFalsePassed
lower price / wrong immutable fieldsFalseFalsePassed
wrong immutable fields / unfilled unchangedFalseFalsePassed
normal contractTrueTruePassed
lower priceTrueTruePassed
unrelated acknowledgmentTrueTruePassed
future revisionTrueTruePassed
no collateral heldTrueTruePassed
price replacementTrueTruePassed
size increaseTrueTruePassed
below executed sizeTrueTruePassed
acknowledged cancelTrueTruePassed

SHA-256 / 896297aafec8c5ca4bfc152b46ba33e0ca237fa00159014107c10a5018b33c4f

Verification & scope

Stipulated toy auction rules, not a venue specification, financial advice, optimization claim, or live trading implementation. Nonnegative integer inputs and internally aligned list fields only. 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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:46:06.957921+00:00.

Case digest / f62bcc964684b6d32ae287c0ad1d4d040633e66bbd690e640024193fcf0b6362