{
"ran": "2026-10-13 23:44 to 2026-10-14 00:32 UTC",
"tools": {
"claudeCode": "2.1.251",
"codex": "codex-cli 0.159.3"
},
"runs": [
{
"status": "did not start: EBUSY: resource busy or locked, rmdir 'C:\\Users\\Public\\bench\\cart-handoff'",
"rep": 1,
"task": "cart",
"test": "checkout total takes the discount off before tax",
"file": "src/cart.js",
"error": "EBUSY: resource busy or locked, rmdir 'C:\\Users\\Public\\bench\\cart-handoff'"
},
{
"status": "counted",
"rep": 1,
"task": "slug",
"test": "long product titles keep a full 60-character slug",
"file": "src/text.js",
"claude": {
"outcome": "done",
"seconds": 86.7,
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"answer": "Found it. No files changed.\n\n## Cause\n\n`truncate()` in `src/text.js:2` always backtracks to the last `-` inside the cut, even when the cut already ended exactly on a word boundary.\n\nTrace for the failing title:\n\n| step | value |\n|---|---|\n| slugified (pre-truncate) | `the-original-...-speckled-glaze-finish-large` |\n| full length | 73 |\n| `cut = s.slice(0, 60)` | `the-original-handmade-ceramic-coffee-mug-with-speckled-glaze` |\n| `cut.lastIndexOf(\"-\")` | 54 |\n| `n - 8` | 52 |\n| `54 > 52` → backtrack | drops `-glaze` |\n\nThe 60-character prefix is already a clean, complete word ending — the very next character in the source string, `s[60]`, is the delimiter `-`. But `truncate` never looks at `s[n]`. It sees a `-` at index 54 (the one before `glaze`), decides that's \"close enough to the end\" to be a word boundary, and chops back to it. The result loses a whole word that fit perfectly.\n\n```mermaid\nflowchart LR\n A[\"s = ...speckled-glaze-finish-large
(73 chars)\"] --> B[\"cut = s.slice(0,60)
...speckled-glaze\"]\n B --> C{\"s[60] == '-' ?
never checked\"}\n C -.->|\"should stop here\"| D[\"...speckled-glaze ✅\"]\n B --> E[\"lastIndexOf('-') = 54
54 > 52\"]\n E --> F[\"cut.slice(0,54)
...speckled ❌\"]\n```\n\n## Why it looks like a slug bug but isn't\n\n`src/slug.js` is fine — `MAX_SLUG = 60`, normalization and `collapse` all behave. The defect is entirely in the shared `truncate` helper, which `slugify` is just a caller of.\n\nTwo things worth flagging before anyone fixes it:\n\n> [!NOTE]\n> `truncate` is a shared helper in `src/text.js`. Check for other callers before changing its behaviour — a fix here affects anything else that truncates at a boundary.\n\nThe `n - 8` threshold is also a magic number with no stated rationale: it means \"only backtrack if we lose fewer than 8 characters.\" Any title whose 60-char prefix happens to land on a boundary hits this bug, not just this one.\n\n## To check\n\n- Run `npm test` — the other 4 tests pass; only test 2 fails.\n- Decide whether the intended fix is \"don't backtrack when `s[n]` is already the delimiter\" (minimal, fixes this case) or a broader rewrite of the boundary logic."
},
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"outcome": "done",
"seconds": 92.1,
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"stepsBeforeFirstEdit": 2,
"steps": 5,
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"input": 21161,
"cached": 162304,
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"answer": "Fixed `src/text.js:5`: `truncate()` now keeps the full prefix when the next character is `-`, preserving the complete 60-character slug.\n\nAll 5 tests pass, including the previously failing test. `git diff --check` passes. Only one line changed.",
"tests": {
"pass": 5,
"fail": 0,
"allPass": true
},
"personMessages": 1,
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"outcome": "done",
"seconds": 101.6,
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"answer": "Fixed `src/text.js:5` to preserve the full 60-character slug when the cut ends at a word boundary, keeping “glaze.”\n\nAll 5 tests pass with `npm test`. No additional checks needed.",
"tests": {
"pass": 5,
"fail": 0,
"allPass": true
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"answer": "Fixed `src/text.js:5`: `truncate()` now preserves the full prefix when the next character is `-`, keeping words that fit exactly.\n\nAll 5 tests pass with `npm test`; `git diff --check` passes. Only the one-line fix changed.",
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"status": "counted",
"rep": 1,
"task": "query",
"test": "repeated tags in the query are all kept",
"file": "src/query.js",
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"answer": "**Cause:** `src/query.js:5` — the loop assigns `out[key] = value` on every iteration, so a repeated key overwrites instead of accumulating. `URLSearchParams` yields `tag=sale` then `tag=new`, so `out.tag` ends as the string `\"new\"`. `tagsOf` then does `[].concat(\"new\")` → `[\"new\"]`, and the first value is gone.\n\nThe doc comment on line 1 says the opposite of what the code does — `{ tag: [\"a\",\"b\"] }` is promised, a single string is delivered. `tagsOf` is already written for the promised shape (`[].concat` handles both string and array), so it's the only broken piece.\n\n```mermaid\nflowchart LR\n A[\"?tag=sale&tag=new\"] --> B[\"URLSearchParams iterates
('tag','sale') then ('tag','new')\"]\n B --> C[\"out.tag = 'sale'\"]\n C --> D[\"out.tag = 'new' ← overwrite\"]\n D --> E[\"[].concat('new')\"]\n E --> F[\"['new'] ≠ ['sale','new']\"]\n```\n\nFix would be one line in `parseQuery` — keep the first value, promote to an array on the second occurrence (e.g. `out[key] = key in out ? [].concat(out[key], value) : value`). `tagsOf` needs no change, and it's the only caller, so nothing else is affected.\n\n> [!NOTE]\n> No files changed, as asked. Say the word and I'll apply the one-liner."
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"answer": "Fixed `src/query.js:5` so repeated query keys accumulate into an array in order; single values remain strings.\n\n`npm test`: all 5 tests pass, including “repeated tags in the query are all kept.” `git diff --check` also passes.",
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"outcome": "done",
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"answer": "Fixed `src/query.js:5` so repeated query values are kept in order as an array. Single values remain strings.\n\nAll 5 tests pass with `npm test`; diff checks pass.",
"tests": {
"pass": 5,
"fail": 0,
"allPass": true
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"personMessages": 1,
"session": "ksYd9QUs"
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"outcome": "done",
"seconds": 56.5,
"secondsToFirstEdit": 45.8,
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"answer": "Fixed `src/query.js:5`: repeated query keys now accumulate values in order, while single values remain strings.\n\nAll 5 tests pass with `npm test`, including “repeated tags in the query are all kept.”",
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"pass": 5,
"fail": 0,
"allPass": true
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"status": "counted",
"rep": 1,
"task": "date",
"test": "order summaries show the date the order was placed",
"file": "src/time.js",
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"answer": "## Cause\n\n`src/time.js:7` — `Date#getUTCMonth()` is **0-based** (Jan = 0), but `isoDate` interpolates it straight into the string without `+ 1`.\n\n```js\nreturn `${d.getUTCFullYear()}-${pad(d.getUTCMonth())}-${pad(d.getUTCDate())}`;\n// ^ 0-based, needs + 1\n```\n\nThe test places an order on **5 March 2026** (`Date.UTC(2026, 2, …)` → month index `2`), so `isoDate` renders `\"2026-02-05\"` instead of `\"2026-03-05\"`.\n\n| | value |\n|---|---|\n| expected | `2026-03-05` |\n| actual | `2026-02-05` |\n\nThe UTC handling itself is correct — `placedAt` is 23:30 UTC and the function consistently uses `getUTC*`, so there's no timezone bug hiding behind this. Every month is off by one, and January (`index 0`) would render as `-00-`.\n\n**Blast radius:** `isoDate` has exactly one caller, `summary()` in `src/orders.js:7`. Fix is `+ 1` in `src/time.js:7`, nothing else. `pad()` is used correctly.\n\nNo files changed, as asked. Say the word and I'll apply the one-character fix."
},
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"outcome": "done",
"seconds": 60.4,
"secondsToFirstEdit": 46.2,
"stepsBeforeFirstEdit": 2,
"steps": 4,
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"cached": 75520,
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"answer": "Fixed `src/time.js:7` by adding `1` to `getUTCMonth()` before formatting, so March renders as `03`.\n\n`npm test` passes all 5 tests, including the order summary date test.",
"tests": {
"pass": 5,
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"outcome": "done",
"seconds": 81.8,
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"input": 20687,
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"answer": "Fixed `src/time.js:7` to convert JavaScript’s zero-based UTC month to the correct calendar month.\n\n`npm test` now passes all 5 tests, including the order summary date test.",
"tests": {
"pass": 5,
"fail": 0,
"allPass": true
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"personMessages": 1,
"session": "MPoF2Mp5"
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"outcome": "done",
"seconds": 76.4,
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"stepsBeforeFirstEdit": 2,
"steps": 4,
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"input": 27039,
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"answer": "Fixed `src/time.js:7` by adding `1` to `getUTCMonth()`, so March renders as `03`.\n\nAll 5 tests pass with `npm test`. No additional checks needed.",
"tests": {
"pass": 5,
"fail": 0,
"allPass": true
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"status": "counted",
"rep": 1,
"task": "limiter",
"test": "the limiter allows exactly the limit in a window",
"file": "src/limiter.js",
"claude": {
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"seconds": 55,
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"answer": "**Cause: an off-by-one in the guard at `src/limiter.js:11`.**\n\n```js\nif (w.count > limit) return false; // should be >=\nw.count += 1;\n```\n\n`w.count` is the number of calls **already** admitted in the window, and the check runs *before* the increment. So admitting a new call requires `count < limit` — the rejection condition is `count >= limit`, not `count > limit`.\n\nTrace with `limit: 3`:\n\n| call | `w.count` at check | `count > 3`? | result | admitted so far |\n|---|---:|---|---|---:|\n| 1 | — (no window, creates `{count: 1}`) | — | `true` | 1 |\n| 2 | 1 | no | `true` | 2 |\n| 3 | 2 | no | `true` | 3 |\n| 4 | 3 | **no** | `true` ← bug | 4 |\n| 5 | 4 | yes | `false` | 4 |\n\nThe window reset at line 7 is correct, which is why the `t = 1000` assertion on line 39 would pass — the test fails one assertion earlier, at line 37, with a 4th `true`.\n\nNet effect: every key gets `limit + 1` calls per window, not `limit`. `limiter` is only used in `test/shop.test.js`; no other callers in `src/`.\n\nFix is one character — `>` → `>=` — but I haven't touched the file as asked. Say the word and I'll apply it."
},
"handoff": {
"outcome": "done",
"seconds": 92.1,
"secondsToFirstEdit": 78.7,
"stepsBeforeFirstEdit": 1,
"steps": 3,
"tokens": {
"input": 52203,
"cached": 100352,
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},
"tokensFresh": 52575,
"answer": "Fixed `src/limiter.js:11`: changed `>` to `>=`, so calls are rejected once the window’s limit is reached.\n\n`npm test` passes: **5 tests, 0 failures**, including the limiter test.",
"tests": {
"pass": 5,
"fail": 0,
"allPass": true
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"outcome": "done",
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"input": 20689,
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"answer": "Fixed the off-by-one check in `src/limiter.js:11`: `>` → `>=`, so calls are rejected once the limit is reached.\n\n`npm test`: all 5 tests pass, including the window reset check.",
"tests": {
"pass": 5,
"fail": 0,
"allPass": true
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"answer": "Changed `>` to `>=` in `src/limiter.js:11`, so calls are rejected once the window’s limit is reached.\n\n`npm test`: all 5 tests pass, including the limit boundary and window reset checks.",
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"pass": 5,
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{
"status": "set aside: a Codex run was refused (Codex usage limit)",
"rep": 1,
"task": "cart",
"test": "checkout total takes the discount off before tax",
"file": "src/cart.js",
"claude": {
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"seconds": 38.1,
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"answer": "**Cause:** `src/cart.js:10` taxes the full subtotal and subtracts the discount afterwards — the opposite of what the docstring one line above says.\n\n```js\nreturn applyDiscount(net + taxOn(net, taxRate), discount); // tax first, then discount\n```\n\nWalking the failing case (`subtotal = 1299×3 + 2549 = 6446`, rate `0.0825`, discount `500`):\n\n| Order | Taxable base | Tax (rounded) | Total |\n|---|---:|---:|---:|\n| Current: tax, then discount | 6446 | 532 | **6478** |\n| Expected: discount, then tax | 5946 | 491 | **6437** |\n\nThe 41¢ gap is tax charged on the 500¢ the shopper never paid (500 × 0.0825 ≈ 41).\n\nThe fix belongs in `total()` — swap to `taxOn` the discounted net:\n\n```js\nconst net = applyDiscount(subtotal(items), discount);\nreturn net + taxOn(net, taxRate);\n```\n\n`pricing.js` is fine: `taxOn` and `applyDiscount` are each correct in isolation (single rounding, floor at 0), they're just composed in the wrong order.\n\n> [!NOTE]\n> `total()` has one other caller — `summary()` in `src/orders.js:8` — so order amounts on any discounted order are over-taxed by the same margin today. Fixing `total()` fixes both; no caller needs touching.\n\nNo files changed, as asked. Say the word and I'll apply it."
},
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"seconds": 40.6,
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"stepsBeforeFirstEdit": 2,
"steps": 5,
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"answer": "Fixed `src/cart.js:9` so `total()` applies the discount before calculating tax.\n\n`npm test`: **all 5 tests pass**, including the previously failing checkout test. `git diff --check` also passes.",
"tests": {
"pass": 5,
"fail": 0,
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"seconds": 15.2,
"secondsToFirstEdit": null,
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"answer": "I’ll read the failing test and checkout code, then outline the fix before changing files.",
"tests": {
"pass": 4,
"fail": 1,
"allPass": false
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"session": "-G8RrSnq"
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"seconds": 13.4,
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"status": "counted",
"rep": 2,
"task": "cart",
"test": "checkout total takes the discount off before tax",
"file": "src/cart.js",
"claude": {
"outcome": "done",
"seconds": 40.4,
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"answer": "**Cause: `src/cart.js:10` applies the operations in the wrong order** — it taxes the full subtotal and *then* subtracts the discount, which contradicts its own doc comment one line above (\"the discount comes off first, then tax on what is left\").\n\n```js\nreturn applyDiscount(net + taxOn(net, taxRate), discount);\n// ^^^^^^^^^^^^^^^^^^^^^^^^ tax computed on pre-discount net\n```\n\nThe arithmetic, in cents:\n\n| Step | Current code | What the test expects |\n|---|---:|---:|\n| subtotal (1299×3 + 2549) | 6446 | 6446 |\n| discount | — | −500 → 5946 |\n| tax @ 8.25% | round(531.795) = 532 | round(490.545) = 491 |\n| discount | −500 | — |\n| **total** | **6478** | **6437** |\n\nThe 41-cent gap is exactly the tax charged on the $5.00 discount (round(500 × 0.0825) = 41).\n\n```mermaid\nflowchart LR\n S[subtotal 6446] --> A[+ tax 532]\n A --> B[− discount 500]\n B --> C((6478 ✗))\n S --> D[− discount 500]\n D --> E[= 5946, + tax 491]\n E --> F((6437 ✓))\n```\n\nNotes for the team:\n\n- `taxOn` and `applyDiscount` in `src/pricing.js` are both correct in isolation — the bug is purely the composition order in `total`.\n- `total` is the single choke point: `src/orders.js:8` (`summary().amount`) is the only other caller, so it has been reporting the same inflated amount. Fixing `cart.js:10` fixes both.\n- Rounding stays a single `Math.round` either way, so there's no double-rounding concern in the fix.\n\nNo files changed, as asked. Say the word and I'll swap line 10 to `taxOn` the discounted net."
},
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"answer": "Fixed `src/cart.js:9` to subtract the discount before calculating tax. The checkout total is now **6437 cents**, as expected.\n\n`npm test`: **all 5 tests pass**.",
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"answer": "Fixed `src/cart.js` to subtract the discount before calculating tax. The checkout total now matches the expected 6,437 cents.\n\nAll 5 tests pass with `npm test`; no test changes were needed.",
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"answer": "Fixed `src/cart.js` to apply the discount before calculating tax. The checkout total is now **6437 cents**.\n\n`npm test`: **all 5 tests pass**.",
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"rep": 2,
"task": "slug",
"test": "long product titles keep a full 60-character slug",
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"answer": "Confirmed and traced. No files changed.\n\n## Cause\n\n`truncate` in `src/text.js:2` backs off to the previous word boundary **even when the cut already landed on one**.\n\nFor the test title the collapsed slug is 73 chars:\n\n```\nthe-original-handmade-ceramic-coffee-mug-with-speckled-glaze-finish-large\n ^ index 60\n```\n\n| step | value |\n|---|---:|\n| `s.length` | 73 |\n| `cut = s.slice(0, 60)` | `…-speckled-glaze` (60 chars — exactly the expected slug) |\n| `s[60]` (next char) | `\"-\"` |\n| `cut.lastIndexOf(\"-\")` | 54 |\n| threshold `n - 8` | 52 |\n| `54 > 52` | true → returns `cut.slice(0, 54)` |\n\nThe slice boundary falls precisely *between* `glaze` and `finish`, so `cut` is already a clean word-complete string. But `truncate` never looks at `s[n]`; it unconditionally hunts backwards for the last `-` inside `cut` and, since `glaze` is only 5 chars (inside the 8-char lookback window), it throws the whole last word away. Result: 54 chars, `…-speckled`.\n\n## Where the fix belongs\n\n`src/text.js:2`, not `slug.js`. `truncate` is missing a guard for \"the cut is already at a boundary\" — the backoff should only apply when the slice splits a word, i.e. when `s[n]` is not the separator. Two secondary smells in the same function, both contributing:\n\n- The separator is hardcoded to `\"-\"` (variable even named `space`) while `collapse` takes `ch` as a parameter — so `truncate` only works for hyphen-joined strings by accident.\n- `n - 8` is an unexplained magic lookback; even with the boundary guard added it decides how aggressively a split word gets dropped.\n\n`slugify` is the only caller today (`src/slug.js:11`), so the fix is contained — but fixing it in `slug.js` would leave `truncate` wrong for the next caller.\n\n```mermaid\nflowchart LR\n A[\"s = 73 chars\"] --> B[\"cut = s.slice(0,60)
…-speckled-glaze\"]\n B --> C{\"s[60] === '-' ?
(check that is missing)\"}\n C -->|\"should: yes → return cut\"| D[\"…-speckled-glaze ✓ 60\"]\n C -.->|\"actual: never asked\"| E[\"lastIndexOf('-') = 54
54 > 52 → slice(0,54)\"]\n E --> F[\"…-speckled ✗ 54\"]\n```\n\nSay the word and I'll apply the guard in `truncate` plus a check that pins the exact-boundary case."
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"answer": "Fixed `src/text.js:5`: `truncate` now preserves the full cut when the next character is `-`, keeping the final complete word.\n\nAll 5 tests pass, including the failing slug test. `git diff --check` passes. Only one line changed.",
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"answer": "Fixed `src/text.js:5` to preserve the full 60-character slug when the cut lands at a word boundary.\n\nAll 5 tests pass with `npm test`, including the failing slug test. No test changes needed.",
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"answer": "Fixed `src/text.js` so `truncate` preserves the full cut when the next character is `-`.\n\nAdded regression tests in `test/shop.test.js` for exact boundaries and split-word backoff.\n\nAll 7 tests pass; `git diff --check` passes.",
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"status": "did not start: page.click: Timeout 30000ms exceeded.",
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"task": "query",
"test": "repeated tags in the query are all kept",
"file": "src/query.js",
"error": "page.click: Timeout 30000ms exceeded."
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"task": "date",
"test": "order summaries show the date the order was placed",
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"answer": "## Cause\n\n`src/time.js:7` — `getUTCMonth()` is **0-indexed** (0 = January), but it's interpolated straight into the `YYYY-MM-DD` string with no `+ 1`.\n\n```js\nreturn `${d.getUTCFullYear()}-${pad(d.getUTCMonth())}-${pad(d.getUTCDate())}`;\n// ^ returns 2 for March\n```\n\nThe chain:\n\n| Step | Value |\n|---|---|\n| Test input | `Date.UTC(2026, 2, 5, 23, 30)` → 5 March 2026, 23:30 UTC |\n| `d.getUTCMonth()` | `2` |\n| `pad(2)` | `\"02\"` |\n| `isoDate` result | `\"2026-02-05\"` |\n| Expected | `\"2026-03-05\"` |\n\n`getUTCFullYear()` and `getUTCDate()` are both correct — only the month is off by one, which is why the year and day match and the failure looks like a one-month shift rather than garbage.\n\n```mermaid\nflowchart LR\n T[\"test: Date.UTC(2026, 2, 5)\"] --> O[\"orders.js:7 summary()\"]\n O --> I[\"time.js:7 isoDate()\"]\n I --> M[\"getUTCMonth() → 2
(0-indexed)\"]\n M --> R[\"'2026-02-05' ✗\"]\n```\n\n## Scope\n\n`isoDate` has exactly one caller (`src/orders.js:7`), and `pad` is only used inside `time.js`. So the defect is contained to the one helper — `pad` itself is fine, it's the argument that's wrong. Fix belongs in `time.js:7`, not in `orders.js`.\n\n> [!NOTE]\n> The test timestamp is `23:30` UTC deliberately. If anyone \"fixes\" this by switching to the local-time accessors (`getMonth()`/`getDate()`), it'll pass in US timezones but produce `2026-03-06` anywhere east of UTC. The docblock says UTC — keep the `getUTC*` family and just add `+ 1` to the month.\n\nNo files changed, as asked. Say the word and it's a one-line fix."
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"answer": "Fixed `src/time.js:7` by adding `1` to `getUTCMonth()`, preserving UTC formatting.\n\n`npm test` passes all 5 tests, including the order-summary date test.",
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"answer": "Fixed `src/time.js:7` to convert JavaScript’s zero-based UTC month to the correct calendar month.\n\nAll 5 tests pass with `npm test`, including the order summary date test. No additional checks needed.",
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"answer": "Fixed `src/time.js:7` by adding `1` to `getUTCMonth()`, preserving UTC date handling.\n\n`npm test` passes all 5 tests, including the order date test.",
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"task": "limiter",
"test": "the limiter allows exactly the limit in a window",
"file": "src/limiter.js",
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"answer": "## Cause\n\n`src/limiter.js:11` — off-by-one in the cap check.\n\n```js\nif (w.count > limit) return false; // should be >=\nw.count += 1;\n```\n\n`w.count` is the number of calls **already allowed** in this window, so the check must reject when it has *reached* the limit, not when it has passed it. With `>`, the counter gets to `limit` and one more call still slips through.\n\nTrace for `limit: 3`:\n\n| call | `w.count` on entry | `count > 3`? | result |\n|---|---:|---|---|\n| 1 | — (new window) | — | `true`, count→1 |\n| 2 | 1 | no | `true`, count→2 |\n| 3 | 2 | no | `true`, count→3 |\n| 4 | 3 | **no** | `true`, count→4 ← should be `false` |\n| 5 | 4 | yes | `false` |\n\nSo the limiter admits `limit + 1` per window. The test's 4th call returns `true` where `false` was expected — exactly the assertion diff. The window-reset half (`t = 1000` → `true`) is fine; line 7's `>=` is correct there.\n\nOne-character fix: `>` → `>=` on line 11. Only caller is the test, so nothing else depends on the loose behaviour. Not applied — you said don't change files yet."
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"answer": "Fixed `src/limiter.js:11`: changed `>` to `>=` so calls are rejected once the limit is reached.\n\n`npm test` passes: **5 tests passed, 0 failed**.",
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"answer": "Fixed `src/limiter.js:12`: changed `>` to `>=` so calls are rejected once the limit is reached.\n\n`npm test` passes all 5 tests, including the limit and window reset checks.",
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"answer": "Changed `src/limiter.js:11` from `>` to `>=`, so calls are rejected once the window’s limit is reached.\n\n`npm test`: all 5 tests pass, including the limit boundary and window reset.",
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"rep": 2,
"task": "query",
"test": "repeated tags in the query are all kept",
"file": "src/query.js",
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"answer": "No history to compare against — single commit. Here's the cause.\n\n## Cause\n\n`src/query.js:5` — `parseQuery` assigns `out[key] = value` while iterating `URLSearchParams`. That iterator yields **one entry per occurrence**, so a repeated key gets overwritten: the last value wins.\n\nFor `?tag=sale&tag=new&sort=newest` the loop runs `out.tag = \"sale\"`, then `out.tag = \"new\"` → `{ tag: \"new\", sort: \"newest\" }`. `tagsOf` then wraps a plain string: `[\"new\"]`.\n\n```mermaid\nflowchart LR\n A[\"?tag=sale&tag=new\"] --> B[\"iterate entries\"]\n B --> C[\"out.tag = 'sale'\"]\n C --> D[\"out.tag = 'new' ← overwrite\"]\n D --> E[\"{ tag: 'new' }\"]\n E --> F[\"tagsOf → ['new']\"]\n```\n\nTwo things confirm `parseQuery` is the defect, not the test:\n\n| Evidence | Where |\n|---|---|\n| Docblock promises `{ tag: [\"a\",\"b\"], sort: \"newest\" }` | `src/query.js:1` |\n| `tagsOf` uses `[].concat(tag)` — only meaningful if `tag` can be an array | `src/query.js:12` |\n\nSo `tagsOf` was already written for the array contract; `parseQuery` never delivered it.\n\n> [!NOTE]\n> `parseQuery` has exactly one caller (`tagsOf`), so fixing it at the source has no other blast radius. The fix is in `parseQuery` — the natural shape is `searchParams.getAll(key)` when a key repeats, keeping a bare string otherwise so `sort` stays `\"newest\"`.\n\nNo files changed, as asked."
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