FA-37281 / Table interactions / Open access

Table clipboard serialization: column cell order · case 01

The table column cell order result violates the stipulated table clipboard serialization contract.

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

ROOT CAUSE

The column cell order decision uses 'text(v) for v in reversed(values)' instead of 'text(v) for v in values'.

THE FAILURE

The column cell order decision uses 'text(v) for v in reversed(values)' instead of 'text(v) for v in values'.

Unsuccessful approach: The attempted repair 'text(v) for v in values if v is not None' still loses a required part of the table contract.

Case contract

Serialize selected rows in current table order and copyable visible columns in schema order. Optional labels precede records, display/raw selection is explicit, None is empty while zero is retained, TSV-special cells use doubled quotes, and records use CRLF without a trailing separator.

Why this case matters

An offline table UI model isolates table clipboard serialization, 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(rows, columns, selected, hidden, include_headers, raw):
    cols=[c for c in columns if c['id'] not in hidden and c.get('copy',True)]
    rr=[r for r in rows if r['id'] in selected]
    def text(v):
        s='' if v is None else str(v)
        return '"'+s.replace('"','""')+'"' if any(x in s for x in ('\t','\n','"')) else s
    lines=[]
    if include_headers: lines.append('\t'.join(text(c['label']) for c in cols))
    for r in rr:
        values=[r.get(c['id']) if raw else r.get('_display',{}).get(c['id'],r.get(c['id'])) for c in cols]
        lines.append('\t'.join(text(v) for v in reversed(values)))
    return '\r\n'.join(lines)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('display selected rows', solve([{'id':'r1','a':1,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 2:
    check('display selected rows', solve([{'id':'r1','a':2,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 3:
    check('display selected rows', solve([{'id':'r1','a':3,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 4:
    check('display selected rows', solve([{'id':'r1','a':4,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 5:
    check('display selected rows', solve([{'id':'r1','a':5,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

check('variant formatted clipboard value', solve([{'id':'r','a':N,'_display':{'a':'value'+str(N)}}], [{'id':'a','label':'A'}], ['r'], [], False, False), 'value'+str(N))
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 fixture	Actual	Expected	Outcome
display selected rows	`Alpha Beta 0 shown x`	`Alpha Beta shown 0 x`	Failed
quoted cells	`"x y" "line next" "x""y"`	`"x""y" "line next" "x y"`	Failed
hidden private	`3`	`3`	Passed
raw mode	`2`	`2`	Failed
header-only	`Alpha`	`Alpha`	Passed
no selection			Passed
variant formatted clipboard value	`value1`	`value1`	Passed

SHA-256 / 944b198dc50a2c269fb994c7d10582cff22f0ca22536730f65aed0823d8aec57

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(rows, columns, selected, hidden, include_headers, raw):
    cols=[c for c in columns if c['id'] not in hidden and c.get('copy',True)]
    rr=[r for r in rows if r['id'] in selected]
    def text(v):
        s='' if v is None else str(v)
        return '"'+s.replace('"','""')+'"' if any(x in s for x in ('\t','\n','"')) else s
    lines=[]
    if include_headers: lines.append('\t'.join(text(c['label']) for c in cols))
    for r in rr:
        values=[r.get(c['id']) if raw else r.get('_display',{}).get(c['id'],r.get(c['id'])) for c in cols]
        lines.append('\t'.join(text(v) for v in values if v is not None))
    return '\r\n'.join(lines)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('display selected rows', solve([{'id':'r1','a':1,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 2:
    check('display selected rows', solve([{'id':'r1','a':2,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 3:
    check('display selected rows', solve([{'id':'r1','a':3,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 4:
    check('display selected rows', solve([{'id':'r1','a':4,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

if N == 5:
    check('display selected rows', solve([{'id':'r1','a':5,'b':0,'_display':{'a':'shown'}},{'id':'r2','a':None,'b':'x'}], [{'id':'a','label':'Alpha'},{'id':'b','label':'Beta'}], ['r2','r1'], [], True, False), 'Alpha\tBeta\r\nshown\t0\r\n\tx')
    check('quoted cells', solve([{'id':'r','a':'x"y','b':'line\nnext','c':'x\ty'}], [{'id':'a','label':'A'},{'id':'b','label':'B'},{'id':'c','label':'C'}], ['r'], [], False, True), '"x""y"\t"line\nnext"\t"x\ty"')
    check('hidden private', solve([{'id':'r','a':1,'b':2,'c':3}], [{'id':'a','label':'A'},{'id':'b','label':'B','copy':False},{'id':'c','label':'C'}], ['r'], ['a'], False, True), '3')
    check('raw mode', solve([{'id':'r','a':2,'b':None,'_display':{'a':'two'}}], [{'id':'a','label':'A'},{'id':'b','label':'B'}], ['r'], [], False, True), '2\t')
    check('header-only', solve([], [{'id':'a','label':'Alpha'}], [], [], True, True), 'Alpha')
    check('no selection', solve([{'id':'r','a':1}], [{'id':'a','label':'A'}], [], [], False, False), '')

check('variant formatted clipboard value', solve([{'id':'r','a':N,'_display':{'a':'value'+str(N)}}], [{'id':'a','label':'A'}], ['r'], [], False, False), 'value'+str(N))
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 fixture	Actual	Expected	Outcome
display selected rows	`Alpha Beta shown 0 x`	`Alpha Beta shown 0 x`	Failed
quoted cells	`"x""y" "line next" "x y"`	`"x""y" "line next" "x y"`	Passed
hidden private	`3`	`3`	Passed
raw mode	`2`	`2`	Failed
header-only	`Alpha`	`Alpha`	Passed
no selection			Passed
variant formatted clipboard value	`value1`	`value1`	Passed

SHA-256 / 01ad34b4f3bed2e06dc3f0147277564d3564965eacfe41235ea8a6e8b396e7c1

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.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

Verification & scope

Source row/column IDs are unique. Cell strings exclude lone carriage returns; quoting models tabs, LF, and double quotes only. 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 2026-09-29T14:42:59.675771+00:00.

Case digest / 32cf32e6af1c04e35d8c7d61ed18b63dadb840f49d846a8cba76da9951ca5a1b