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FA-37231 / Table interactions / Open access

Atomic table row editing: untouched cell preservation · case 01

The table untouched cell preservation result violates the stipulated atomic table row editing contract.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The untouched cell preservation decision uses 'updated={}' instead of 'updated=dict(row)'.

THE FAILURE

The untouched cell preservation decision uses 'updated={}' instead of 'updated=dict(row)'.

Unsuccessful approach: The attempted repair 'updated={k:v for k,v in row.items() if k in allowed}' still loses a required part of the table contract.

Case contract

Row commits validate the merged draft atomically, reject unknown schema fields, ignore readonly fields, preserve untouched cells and stable identity, reject revision conflicts, suppress no-ops, and increment the revision only after actual changes.

Why this case matters

An offline table UI model isolates atomic table row editing, including adversarial row/column relationships.

1 / The failure

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

N = 1
observations = []
def solve(row, draft, schema, revision, base_revision):
    allowed={c['id'] for c in schema if c.get('editable',True)}
    unknown=sorted(set(draft)-{c['id'] for c in schema})
    changes={k:v for k,v in draft.items() if k in allowed and row.get(k)!=v}
    errors={c['id']:'required' for c in schema if c.get('required') and draft.get(c['id'],row.get(c['id'])) in ('',None)}
    if unknown: return {'status':'unknown','fields':unknown,'row':row}
    if errors: return {'status':'invalid','fields':errors,'row':row}
    if base_revision!=revision: return {'status':'conflict','fields':[],'row':row}
    if not changes: return {'status':'unchanged','fields':[],'row':row}
    updated={}; updated.update(changes)
    return {'status':'saved','fields':sorted(changes),'row':updated,'revision':revision+1}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':1+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 4, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1}})

if N == 2:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':2+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 5, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1}})

if N == 3:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':3+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 6, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1}})

if N == 4:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':4+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 7, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1}})

if N == 5:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':5+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 8, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 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
partial draft{'fields': ['a'], 'revision': 5, 'row': {'a': 4}, 'status': 'saved'}{'fields': ['a'], 'revision': 5, 'row': {'a': 4, 'b': 2, 'id': 'r'}, 'status': 'saved'}Failed
readonly draft{'fields': [], 'row': {'a': 1, 'b': 2, 'id': 'r'}, 'status': 'unchanged'}{'fields': [], 'row': {'a': 1, 'b': 2, 'id': 'r'}, 'status': 'unchanged'}Passed
unknown draft{'fields': ['missing'], 'row': {'a': 1, 'id': 'r'}, 'status': 'unknown'}{'fields': ['missing'], 'row': {'a': 1, 'id': 'r'}, 'status': 'unknown'}Passed
required clear{'fields': {'a': 'required'}, 'row': {'a': 'ok', 'b': 2, 'id': 'r'}, 'status': 'invalid'}{'fields': {'a': 'required'}, 'row': {'a': 'ok', 'b': 2, 'id': 'r'}, 'status': 'invalid'}Passed
required untouched{'fields': ['b'], 'revision': 5, 'row': {'b': 0}, 'status': 'saved'}{'fields': ['b'], 'revision': 5, 'row': {'a': 'ok', 'b': 0, 'id': 'r'}, 'status': 'saved'}Failed
stale row{'fields': [], 'row': {'a': 1, 'id': 'r'}, 'status': 'conflict'}{'fields': [], 'row': {'a': 1, 'id': 'r'}, 'status': 'conflict'}Passed
same value{'fields': [], 'row': {'a': 1, 'id': 'r'}, 'status': 'unchanged'}{'fields': [], 'row': {'a': 1, 'id': 'r'}, 'status': 'unchanged'}Passed

SHA-256 / 6254e15d07954c0dacb6f91aa0b975d0c0bd79d1d01c3e79b7bd722224287776

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(row, draft, schema, revision, base_revision):
    allowed={c['id'] for c in schema if c.get('editable',True)}
    unknown=sorted(set(draft)-{c['id'] for c in schema})
    changes={k:v for k,v in draft.items() if k in allowed and row.get(k)!=v}
    errors={c['id']:'required' for c in schema if c.get('required') and draft.get(c['id'],row.get(c['id'])) in ('',None)}
    if unknown: return {'status':'unknown','fields':unknown,'row':row}
    if errors: return {'status':'invalid','fields':errors,'row':row}
    if base_revision!=revision: return {'status':'conflict','fields':[],'row':row}
    if not changes: return {'status':'unchanged','fields':[],'row':row}
    updated={k:v for k,v in row.items() if k in allowed}; updated.update(changes)
    return {'status':'saved','fields':sorted(changes),'row':updated,'revision':revision+1}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':1+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 4, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1}})

if N == 2:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':2+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 5, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1}})

if N == 3:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':3+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 6, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1}})

if N == 4:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':4+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 7, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1}})

if N == 5:
    check('partial draft', solve({'id':'r','a':1,'b':2}, {'a':5+3}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'saved', 'fields': ['a'], 'row': {'id': 'r', 'a': 8, 'b': 2}, 'revision': 5})
    check('readonly draft', solve({'id':'r','a':1,'b':2}, {'b':9}, [{'id':'a'},{'id':'b','editable':False}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 1, 'b': 2}})
    check('unknown draft', solve({'id':'r','a':1}, {'missing':2}, [{'id':'a'}], 4, 4), {'status': 'unknown', 'fields': ['missing'], 'row': {'id': 'r', 'a': 1}})
    check('required clear', solve({'id':'r','a':'ok','b':2}, {'a':''}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'invalid', 'fields': {'a': 'required'}, 'row': {'id': 'r', 'a': 'ok', 'b': 2}})
    check('required untouched', solve({'id':'r','a':'ok','b':2}, {'b':0}, [{'id':'a','required':True},{'id':'b'}], 4, 4), {'status': 'saved', 'fields': ['b'], 'row': {'id': 'r', 'a': 'ok', 'b': 0}, 'revision': 5})
    check('stale row', solve({'id':'r','a':1}, {'a':2}, [{'id':'a'}], 4, 3), {'status': 'conflict', 'fields': [], 'row': {'id': 'r', 'a': 1}})
    check('same value', solve({'id':'r','a':1}, {'a':1}, [{'id':'a'}], 4, 4), {'status': 'unchanged', 'fields': [], 'row': {'id': 'r', 'a': 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
partial draft{'fields': ['a'], 'revision': 5, 'row': {'a': 4}, 'status': 'saved'}{'fields': ['a'], 'revision': 5, 'row': {'a': 4, 'b': 2, 'id': 'r'}, 'status': 'saved'}Failed
readonly draft{'fields': [], 'row': {'a': 1, 'b': 2, 'id': 'r'}, 'status': 'unchanged'}{'fields': [], 'row': {'a': 1, 'b': 2, 'id': 'r'}, 'status': 'unchanged'}Passed
unknown draft{'fields': ['missing'], 'row': {'a': 1, 'id': 'r'}, 'status': 'unknown'}{'fields': ['missing'], 'row': {'a': 1, 'id': 'r'}, 'status': 'unknown'}Passed
required clear{'fields': {'a': 'required'}, 'row': {'a': 'ok', 'b': 2, 'id': 'r'}, 'status': 'invalid'}{'fields': {'a': 'required'}, 'row': {'a': 'ok', 'b': 2, 'id': 'r'}, 'status': 'invalid'}Passed
required untouched{'fields': ['b'], 'revision': 5, 'row': {'a': 'ok', 'b': 0}, 'status': 'saved'}{'fields': ['b'], 'revision': 5, 'row': {'a': 'ok', 'b': 0, 'id': 'r'}, 'status': 'saved'}Failed
stale row{'fields': [], 'row': {'a': 1, 'id': 'r'}, 'status': 'conflict'}{'fields': [], 'row': {'a': 1, 'id': 'r'}, 'status': 'conflict'}Passed
same value{'fields': [], 'row': {'a': 1, 'id': 'r'}, 'status': 'unchanged'}{'fields': [], 'row': {'a': 1, 'id': 'r'}, 'status': 'unchanged'}Passed

SHA-256 / 2e0386498c48ac9848a6b9d5cae0f7a3305cbeede640751b7334e53c028fdc8f

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 7 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

Schema IDs are unique, revisions are integers, and required validation means only None or empty string. Deterministic offline table UI model; no browser, DOM, framework, or standards conformance is claimed. 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 2026-09-29T14:42:59.279204+00:00.

Case digest / 842983e1a906d80110d3f446861ebb4a3bb0421c624160da5a80183825d5c0f9