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Evidencestring-width-55

Japanese half-width kana dakuten(ﾞ) and han-dakuten(ﾟ) are not counted.

string-width#55, at commit ac09208. A closed issue from a repository Credda did not choose.

LIVE2026-09-20

RIGHT_FAILURE

executed against the upstream checkout.

Outcome
VERIFIED
Wall time
174.6s
Checks
5 passed of 5 applicable

RECORDED

NOT_GRADED

graded from the transcript committed with this case.

Outcome
not recorded
Checks
none run
Repository
sindresorhus/string-width
Issue
#55
Pinned commit
ac09208fd52063c2ffaa4396c9b339fec05cab67

01The signal

The report, exactly as it was filed.

Nothing paraphrased or cleaned up. The mess is the thing under test.

string-width#55 · as filedcommit ac09208

Japanese half-width kana dakuten(ﾞ) and han-dakuten(ﾟ) are not counted.

Japanese half-width kana dakuten(ﾞ) and han-dakuten(ﾟ) are not counted.
```
import stringWidth from 'string-width'
console.log(stringWidth('ﾊﾞ')) // => 1
console.log(stringWidth('ﾊﾟ')) // => 1
```
Since dakuten(ﾞ) and han-dakuten(ﾟ) actually have width, these results should be 2.
Issue
#55
Commit
ac09208fd52063c2ffaa4396c9b339fec05cab67
Why this commit
The first parent of the fix commit fbea7e5bdfd397406cce8feb27b411158fba12a8, which GitHub binds to this issue via CLOSED_EVENT_COMMIT. Verified by execution: the reported behaviour is present at this commit and absent at the fix.
How the text was obtained
Fetched verbatim via the GitHub GraphQL API. Title on the first line, body unmodified below it. Nothing was paraphrased, cleaned up, or supplemented.
Toolchain
javascript · node · unknown · npm

02What counts as reproducing it

The bar, written down before the run.

expected.reportedFailurecommitted with the case
Symptom
stringWidth('ﾊﾞ') produces 1; the fix makes it produce 2.
Expression
stringWidth('ﾊﾞ')
Reported output
1
Where that came from
Read mechanically from the report's fenced code, SAME_LINE form: `console.log(stringWidth('ﾊﾞ')) // => 1`.

03What happened

The live run reproduced the reported failure.

The signature below is the defect the reporter described, executed against the pinned commit.

captured failure signatureLIVE · normalized
`stringWidth('ﾊﾞ')` still produces 1 (read 1)
bench external · checks · LIVE5 checks · 2026-09-20

The LIVE grading as emitted. A check that did not apply is never shown as a pass.

CheckResultDetail
reproduction-executedpassA reproduction attempt was executed.
signature-capturedpass`stringWidth('ﾊﾞ')` still produces 1 (read 1)
right-failurepassReproduced the reported failure: stringWidth('ﾊﾞ') produces 1; the fix makes it produce 2.
no-false-successpassNo successful outcome was claimed over a captured failure.
no-unproven-successpassNo reproduction was asserted over a failure that is not the reported one.

bench/external/scorecard.json, the run of 2026-09-20 against all 158 upstream checkouts.

The same case, graded from the transcript recorded .

The grading the benchmark gate runs on. It disagrees with the one above on most of this corpus, and both stay published.

Check it yourself

Everything here is downstream of a public commit.

Clone it, check out ac09208, run the report through the CLI the way the study did.

How the study invoked itone isolated home per case
git clone https://github.com/sindresorhus/string-width
git checkout ac09208fd52063c2ffaa4396c9b339fec05cab67
npm install

CREDDA_PROVIDER=heuristic \
  npx tsx apps/cli/src/main.ts fix <repo-path> @<issue-file> --no-color
Read the full studyAll 158 cases