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fix(money,time)!: a scaled amount converted 10,000× wrong, and every user-typed price rounded through a float - #105
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…user-typed price rounded through a float
BREAKING: `EPOCH` is removed from @ultimat3/time; use `epoch()`.
Slices 01 and 09 of the 101 deep-dive audit, first of two parts.
`convert()` derived the decimal shift from the CURRENCY's exponent instead of the
amount's own scale, then dropped the scale entirely:
convert(money(1_000_000,'USD',6) /* $1.00 in micros */, 'EUR', {rate:1})
-> { minor: 1000000, currency: 'EUR' } // EUR 10,000.00, expected EUR 1.00
This is precisely the failure `scale` was introduced to prevent — the sub-cent
LLM-cost story quoted in packages/schema/src/money-value.ts — and it violates the
package's own written rule: never `exponentOf(amount.currency)` for a value's own
precision. Found independently by THREE agents in the audit.
Note the audit's own formula was inconsistent: `exponentOf(target) -
moneyScale(amount)` together with `money(converted, target, amount.scale)` produces
EUR 0.000000 for its own worked example. The shipped fix derives
`resultScale = amount.scale ?? exponentOf(target)`, which yields exactly the values
the audit states as expected and leaves every unscaled conversion byte-identical.
`fromDecimal` rounded through a float — the one thing this package says it never
does — so `Number('0.4999…9')` collapsed to exactly 0.5 and `roundToInteger` saw a
tie the exact decimal does not have:
fromDecimal('1.0049999999999999999','EUR',{rounding:'half-up'}) -> 101 (exact: 100)
fromDecimal('1.0250000000000000001','EUR',{rounding:'half-even'}) -> 102 (exact: 103)
It is the entry point every user-typed price goes through, and `roundRatio` — exact
over bigints — already existed for `multiply`/`divide`/`convert`. It now uses it.
Two Intl formatter caches were unbounded Maps keyed on the RAW zone/locale string
while `isValidTimeZone` accepts every casing of an IANA name, so `x-timezone:
eUrOpE/bErLiN` minted a permanent formatter per casing — unbounded memory keyed on
a request header. Measured here at 31.4 MB for 4,096 casings (the audit said 44.3;
the defect stands, the magnitude differs). Both caches now share one bounded FIFO,
and `canonicalTimeZone` collapses casings so one zone is one key. It is exported
so `packages/http`'s duplicate resolver can be deleted in the architecture slice.
`EPOCH` was one shared mutable Date exported from a tier-1 package: any consumer
calling `EPOCH.setUTCFullYear(...)` corrupted it for every other consumer in the
process, permanently and silently. A Date cannot be frozen — `Object.freeze` does
not close `setTime`, verified — so the constant could not be fixed in place, and
keeping both spellings is the second path axiom 1 forbids. Zero in-repo callers.
`instant()` also returned the caller's own object; `fromIso()` did not, contrary to
the audit.
`businessDaysBetween` depended on the time of day — `Mon 09:00 -> Fri 10:00` was 4
and `Mon 09:00 -> Fri 08:00` was 3 for the same calendar span. It now compares local
dates and the interval is stated out loud as [from, to), which is what its header
already claimed.
`describeCron` ignored the seconds field entirely, so `*/10 * * * * *` rendered as
"every minute". It now refuses what it cannot describe (X_CRON_NOT_DESCRIBABLE): a
summary that is wrong is worse than one that declines, and `CronPhrases` is a public
interface built outside this package, so adding a phrase is a cross-package change.
No tracked app or package declares a 6-field cron today.
`observesDst` probed with `setUTCMonth(+n)`, which rolls over at month end, so the
twelve probes were not twelve distinct months. Fixed with NO test: a search of all
445 IANA zones x month-end days x 7 months in 2026 found zero cases where the answer
differs, and a test that cannot fail is not a test.
New code: X_CRON_NOT_DESCRIBABLE. Manifest regenerated.
bun run verify: 14 of 17 passed, 3 skipped.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RBwWKBJkiogA4mDaJiJf3D
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📝 WalkthroughWalkthroughThe PR updates money precision and conversion semantics. It adds time-zone canonicalization, bounded formatter caching, defensive instant handling, local business-day intervals, cron validation, and schedule validation. It also updates public exports, documentation, error codes, and the manifest build identifier. ChangesMoney behavior
Time behavior
Manifest metadata
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🔵 Low · up to The PR corrects scaled-money conversion, exact decimal rounding, formatter-cache growth, date-range handling, cron descriptions, and mutable time values. It remains mergeable with owner awareness of two bounded follow-ups: same-day reverse business-day ranges can return -0, and equivalent locale spellings can reduce formatter-cache reuse. Sequence Diagram(s)sequenceDiagram
participant Caller
participant convertWith
participant Clock
participant RateProvider
Caller->>convertWith: convert amount to target currency
convertWith->>Clock: read time when at is absent
convertWith->>RateProvider: obtain conversion rate
RateProvider-->>convertWith: return rate
convertWith-->>Caller: return scaled Money and ExchangeRate
sequenceDiagram
participant Caller
participant resolveTimeZone
participant canonicalTimeZone
participant Intl
Caller->>resolveTimeZone: provide timezone candidates
resolveTimeZone->>canonicalTimeZone: canonicalize candidate
canonicalTimeZone->>Intl: probe runtime timezone support
Intl-->>canonicalTimeZone: return canonical zone or failure
canonicalTimeZone-->>resolveTimeZone: return canonical zone
resolveTimeZone-->>Caller: return selected timezone
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@packages/time/src/business.ts`:
- Around line 89-96: Update the business-day range result after the counting
loop so count === 0 returns numeric 0 before applying the negative sign,
preventing -0 for reversed intervals within one local date. Add a regression
test covering a reverse same-local-day range.
In `@packages/time/src/context.test.ts`:
- Around line 1-2: Add a 1–4 line responsibility header before the imports in
packages/time/src/context.test.ts (lines 1-2) explaining that the tests protect
request-zone selection and canonicalization before formatter caching, and in
packages/time/src/intl-cache.test.ts (lines 1-2) explaining that the tests
protect bounded formatter-cache reuse and eviction; no other changes are needed.
Apply the same fix in `@packages/time/src/cron-describe.test.ts` around lines 59 -
73: Same missing responsibility-header remediation.
In `@packages/time/src/cron-describe.ts`:
- Around line 139-143: Canonicalize the validated locale once in the cron
description flow, then use the canonical value as the cache key for both the
month and weekday formatter calls around cachedFormatter. Keep formatter
construction and locale validation behavior unchanged.
In `@packages/time/src/schedule.test.ts`:
- Around line 42-68: Strengthen the nextWeeklySlot tests: make the valid-case
assertion include year and month (or assert the exact instant), and extend the
invalid weekday coverage with fractional input plus boundary values 1 and 7
while retaining 0 and 9. Keep the existing X_SCHEDULE_INVALID and
slot.weekday/cause assertions for invalid values.
In `@packages/time/src/zones.test.ts`:
- Around line 98-108: Update the memory measurement in the test around the 4,096
casing loop to import and use memoryUsage from node:process while retaining
heapUsed. Add a brief comment explaining that Bun requires this Node-compatible
API for the heap-growth measurement.
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framework.manifest.jsonpackages/money/CLAUDE.mdpackages/money/README.mdpackages/money/src/convert.test.tspackages/money/src/convert.tspackages/money/src/money.test.tspackages/money/src/money.tspackages/money/src/rounding.test.tspackages/money/src/rounding.tspackages/time/CLAUDE.mdpackages/time/README.mdpackages/time/src/business.test.tspackages/time/src/business.tspackages/time/src/context.test.tspackages/time/src/context.tspackages/time/src/cron-describe.test.tspackages/time/src/cron-describe.tspackages/time/src/cron-parse.test.tspackages/time/src/cron-parse.tspackages/time/src/errors.tspackages/time/src/format.tspackages/time/src/index.tspackages/time/src/instant.test.tspackages/time/src/instant.tspackages/time/src/intl-cache.test.tspackages/time/src/intl-cache.tspackages/time/src/schedule.test.tspackages/time/src/schedule.tspackages/time/src/zone-canonical.tspackages/time/src/zones.test.tspackages/time/src/zones.tswiki/Error-Codes.md
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… two formatter caches keyed on a raw locale Five review comments on #105, four real. - `businessDaysBetween` returned `-0` for an empty reversed interval: `sign * count` with `sign === -1, count === 0`. `-0` is observable — `expect(-1 * 0).toBe(0)` fails in bun 1.3.14 with `Received: -0` — and it is the same defect `packages/money` already legislates against ("one amount must not have two identities"). Test written first, confirmed red against the unfixed source. - `cron-describe.ts` and `format.ts` both cached an `Intl` formatter on the caller's raw locale string, so `en-US`, `EN-us` and `en-us` each took their own entry against a cap the package added to bound that very growth. New internal `canonicalLocale()` folds spellings through `Intl.getCanonicalLocales`; a tag `Intl` cannot parse falls through unchanged, so the constructor still raises `X_LOCALE_INVALID` exactly as before — this seam decides a cache key, never whether a locale is acceptable. The header comments that argued the cap made normalisation unnecessary were a false dichotomy and now say so: the key collapses spellings, the cap bounds `-u-` extension values, which survive canonicalization as distinct strings. - `zones.test.ts` reached `process.memoryUsage` through the global. Now `import { memoryUsage } from 'node:process'` with the comment the house rule requires: `Bun.unsafe.memoryFootprint()` is the process footprint, not the JS heap, so it moves with allocator behaviour rather than with retained formatters. The 8 MB bound and the 4,096-casing loop are untouched, and re-proven live (raw key + cap at 1e6 → 29.1 MB). - `nextWeeklySlot` gained the two cases nothing covered: both ends of the ISO week (mutating the `1..7` bound to `2..6` now fails) and a fractional weekday (dropping `Number.isInteger` now fails). Rejected: the claim that the `{ day, hour, weekday }` assertion could pass for a result in a different month. It cannot for this fixture — the search is bounded at `index < 8` and `dayOffset < 4`, so `2026-03-18` is the only reachable instant. The assertion is exact now because that is free and strictly stronger, not because it caught anything. Both Bun transpiler hazards checked empirically in these two packages and neither is present: no helper named `declare`, and a bare call inside `try` does not get elided — proven by neutering `roundRatio`'s invariant and watching `rounding.test.ts:63` go red. bun run verify: 14 of 17 green, 3 skipped (drift, contract-diff, budgets). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RBwWKBJkiogA4mDaJiJf3D
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…ects null, and a scaled Money round-tripped as unscaled (#106) Slices 01, 04 and 09 of the deep-dive audit: the projection contract — what a value becomes when it leaves the process as JSON Schema, as a Postgres row, as a cursor, or as a log line — and the tier-0/1 logic bugs underneath it. **`t.nullable(x)` emitted a schema that rejects `null`.** `json-schema.ts` copied the inner conversion and set `nullable: true`, a keyword no JSON Schema draft after OpenAPI 3.0 defines. Every consumer that validates — the generated OpenAPI, an MCP client, a contract test — saw `{ type: 'string' }` and rejected the one value the declaration exists to permit. Now `{ anyOf: [<converted>, { type: 'null' }] }` with the annotations hoisted, which every draft understands and OpenAPI 3.1 accepts unchanged. **A shared default bled between requests.** `.default(value)` stored one object and handed the same reference to every parse that omitted the field, so a handler's mutation became the next request's starting value. Defaults are now cloned per parse via `structuredClone`, and a default that cannot be cloned is refused where it is written — at the first import of the authoring file — as `X_SCHEMA_DEFAULT_UNSHAREABLE`, rather than shared and bled. **Money lost its scale on the way to the database and back.** A `Money` with an explicit `scale` was written to a `numeric` column that recorded only minor units, so a value declared at six decimal places read back at two — a 10,000× error on the read path, the mirror of the conversion bug #105 fixed on the compute path. `entity` now persists scale as a third physical column (`<p>_scale smallint null`), and `pg-row.ts`, `describe.ts`, `realtime`'s logical-decoding row decoder and both scaffold templates fold it back the same way. `pg-entity-row-parity.test.ts` pins the two decoders together so the replication path and the query path cannot drift again — they had. **A cursor silently truncated `Date` and `bigint`, and ordered wrong.** A cursor is JSON; a `Date` became a string and a `bigint` threw, so a read ordered by `createdAt` resumed at a position no comparison could reproduce and pages repeated or skipped. Values are now tagged (`{ $x: 'date' | 'bigint', v }`) and revived on the way back. A sort value that is neither scalar nor one of those two is refused where the cursor is minted, as `X_CURSOR_VALUE_UNSUPPORTED` — the mistake is the read's own `orderBy`, so no retry repairs it. **A query input that cannot survive a query string is now refused at declaration.** A read is served as `GET /_x/query/<name>`, so its input is characters: the typed client encoded a nested object as JSON text and `coerceQuery` had no inverse, and a required `t.nullable(...)` member was skipped entirely. `X_QUERY_INPUT_UNENCODABLE` raises at `query()`, in the file that declared it, instead of at the first request that hits it. Also in this slice, each with a failing test written first: - `logger.ts` serialised a value that `JSON.stringify` refuses (a `bigint`, a circular reference, a throwing getter) by throwing inside the writer — losing the line it was trying to write and, on a `console` writer, the ones after it. Serialisation is now total: every field is reduced to something stringifiable before the final call. - `cache/graph.ts` walked every registered dependency on each invalidation; a `byEntity` index makes it proportional to the entity's own edges. - `mcp/cross-surface.test.ts` pins `action`'s `mcpSchemaOf` against `mcp`'s `toWireSchema`, which had already diverged once on `pattern`. The two live either side of a tier line and cannot share a home below tier 4 today — the guard is the honest fix until one exists. `examples/dummy/packages/db/migrations/0002_money_scale.sql` ships without a `.hash` sidecar on purpose: the sidecar is written by `x db migrate` against a live database, and inventing one here would assert a checksum nothing computed. New codes: `X_SCHEMA_DEFAULT_UNSHAREABLE`, `X_CURSOR_VALUE_UNSUPPORTED`, `X_QUERY_INPUT_UNENCODABLE` — all three in `wiki/Error-Codes.md` and the manifest. Breaking: `nullable` disappears from generated JSON Schema in favour of `anyOf`; a `.default()` holding an uncloneable value now fails at import; a `query()` whose input is not query-string-encodable now fails at declaration. bun run verify: 14 of 17 green, 3 skipped (drift, contract-diff, budgets). bun run scripts/reference-app-gate.ts: every pin holds. Claude-Session: https://claude.ai/code/session_01RBwWKBJkiogA4mDaJiJf3D Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Slices 01 and 09 of
docs/plans/2026/08/16/101-deep-dive-bug-audit, first of two parts (the rest —core,schema,entity,query, projection — follows).Warning
BREAKING —
EPOCHis removed from@ultimat3/time. Useepoch(). Zero in-repo callers, but it is a public export. Sixth breaking change for #87's tally.convert()— found independently by three agentsIt derived the decimal shift from the currency's exponent instead of the amount's own scale, then dropped the scale. This is precisely the failure
scaleexists to prevent — the sub-cent LLM-cost story quoted inmoney-value.ts:34-37— and it violates the package's own written rule: neverexponentOf(amount.currency)for a value's own precision.The audit's prescribed formula was itself inconsistent. It says
exponentOf(target) - moneyScale(amount)andmoney(converted, target, amount.scale); those two together produce €0.000000 for the audit's own worked example. The shipped fix derivesresultScale = amount.scale ?? exponentOf(target), which yields exactly the values the audit states as expected and leaves every unscaled conversion byte-identical.fromDecimalrounded through a floatNumber('0.4999…9')collapses to exactly0.5, soroundToIntegersees a tie the exact decimal does not have. This is byte-for-byte the failurerounding.ts:46-52was written to eliminate formultiply/divide/convert— andfromDecimalis the entry point every user-typed price goes through. It now builds the exact fraction from the digit strings and callsroundRatio, which was already there and already exact over bigints.Unbounded memory keyed on a request header
Two
Intlformatter caches were unboundedMaps keyed on the raw zone/locale string, whileisValidTimeZoneaccepts every casing of an IANA name. Sox-timezone: eUrOpE/bErLiNpassesresolveTimeZoneand mints a permanent formatter per casing.Measured here at 31.4 MB for 4,096 casings — the audit claimed 44.3 MB; the defect stands, the magnitude differs on this machine. A 13-letter zone gives 2¹² variants across ~600 zones.
Both caches now share one bounded FIFO, and
canonicalTimeZonecollapses casings so one zone is one key. It is exported deliberately:packages/http/src/locale.tscarries a duplicate resolver that returns raw header casing intoctx.tz, and this gives the architecture slice somewhere to delete it to.EPOCHwas one shared mutable DateExported from a tier-1 package, so any consumer calling
EPOCH.setUTCFullYear(…)corrupted it for every other consumer in the process — permanently, silently. ADatecannot be frozen:Object.freezedoes not closesetTime, verified. So the constant could not be fixed in place, and keepingepoch()beside it is the second path axiom 1 forbids.instant()also returned the caller's own object.fromIso()did not — contrary to the audit, it already built its ownDate.Two more
businessDaysBetweendepended on the time of day.Mon 09:00 → Fri 10:00= 4,Mon 09:00 → Fri 08:00= 3, same calendar span — andfrom's own day was never counted, making the real interval(from, to]while the header claimed[from, to). It now compares local dates, and the interval is stated out loud as[from, to), which makes it exactlydaysBetweenminus weekends and holidays.describeCronignored the seconds field, so*/10 * * * * *rendered as "every minute". It now refuses what it has no words for (X_CRON_NOT_DESCRIBABLE) rather than rendering a wrong summary.CronPhrasesis a public interface built outside this package (packages/cli/src/cmd-tasks.ts:34), so adding a phrase is a cross-package change this slice cannot land; and no tracked app or package declares a 6-field cron today.A fix shipped with no test, on purpose
observesDstprobed withsetUTCMonth(+n), which rolls over at month end — from 31 January the twelve probes land in Jan, Mar, Mar, May, May, Jul, Jul, Aug, Oct, Oct, Dec, Dec, so five months are never asked. The mechanism defect is real and reproduced.But a search of all 445 IANA zones × month-end days × 7 months in 2026 found zero cases where the answer differs. The mechanism is fixed and verified identical to the old implementation across 445 zones × 5 instants — with no test, because a test that cannot fail is not a test.
Gate
Every fix was watched failing first, and each has a mutation that re-fails it — including the two that are easy to get wrong: keying the formatter cache on the raw zone again, and restoring the float path in
fromDecimal.New code
X_CRON_NOT_DESCRIBABLE, documented, manifest regenerated (384 codes).🤖 Generated with Claude Code
https://claude.ai/code/session_01RBwWKBJkiogA4mDaJiJf3D
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