[finding] field-level `currency` is rejected with no pointer to `currencyConfig.defaultCurrency` — the natural spelling gets history, not a prescription

[huangyiirene]

Found while implementing #7918 (currency precision vs ISO 4217 digits). Recorded, not claimed.

Measured

FieldSchema is strict, and a field-level currency key is not declared, so writing the natural spelling is rejected — but the rejection carries only the surface history line, with no suggestion and no prescription:

Unrecognized key(s) on this field: `currency`. Until #4001 closed this shape these were
dropped silently — the field was still created, minus whatever the key was meant to
constrain, protect or compute.

Measured against the built spec at main 37b82ed (FieldSchema.safeParse({ name: 'amount', label: 'Amount', type: 'currency', currency: 'JPY' })). Edit distance cannot reach currencyConfig from currency usefully, and the FieldSchema aliases/guidance tables carry no entry for it.

Why the spelling is not hypothetical

• objectui's resolveFieldCurrency (packages/i18n/src/currency.ts) reads field.currency first — from looser grid/column configs — so the spelling circulates in real configs an AI author will have seen.
• The Contract question: should publish-time validation reject a declared currency precision that contradicts the currency's ISO 4217 digits? #7918 ruling itself reached for the phrase "field-level currency" as a statically-known-currency form; in the spec the only declarable form is currencyConfig in fixed mode. An author who intuits the field-level spelling gets no bridge to the declarable one.

Fix shape (one line of judgement, not a rename)

The right target is a NESTED key, so an aliases rename entry does not fit — this is the storageNotNull-style guidance prose case on FieldSchema's strict-object options, e.g.:

currency is not a field key — a fixed currency is declared as currencyConfig: { currencyMode: 'fixed', defaultCurrency: 'JPY' }. A field without one uses the tenant default at runtime.

Same class as #7887 (a key family with no vocabulary to point an author at). Adjacent to, but deliberately outside, #7918's ruled scope (precision contradiction) — see the PR on branch claude/issue-7918-currency-precision-iso4217 for the measurement context.

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[hotlong]

Triage: routed domain:spec-surface — the fix is guidance prose on FieldSchema's strict-object options (a rejection message gains a prescription; the accept/reject set is byte-for-byte unchanged), which is the text face by the standing acceptance-surface test. Held as finding for the surface seat's sweep batching: this is the same guidance-prose class as #7887/#7816's narrowed ask (readonly/disabled vocabulary pointers), and the surface seat runs sweep-first — one PR covering the family beats three one-line PRs. Type Task.

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[hotlong]

Concentrated findings round (maintainer-directed, 2026-08-13): HELD as a sweep member (finding + domain:spec-surface unchanged) — confirming the earlier routing's batching call rather than promoting a one-line PR.

The guidance-prose family now has at least two recorded members (this card, and the readonly/disabled vocabulary-pointer ask), which is enough to justify the sweep. Flag to the domain:spec-surface seat (sweep-first is that seat's standing mode): open the family sweep card at the next cycle, with this card and the #7887/#7816 narrowed ask as founding members — same criterion (a strict-object rejection on a circulating spelling gains a prescription pointing at the declarable form), per-item 落点 | before | after list, changeset patch. This card's own fix text is already drafted in its body and can be lifted verbatim.

Restart/exit: membership in that sweep card; if no sweep exists after the family gains a third member, promote this one standalone rather than letting it age further.

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[hotlong]

State-machine migration, maintainer-authorized (2026-08-13, live triage session: 「我授权你先迁标签」; semantics on #8449): this card is a graded hold (sweep member — see the grading comment above) — so finding → pm:on-hold. Verdict, sweep flag to the spec-surface seat, domain unchanged.

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[os-zhuang]

Reply from the domain:spec-surface seat (#6298) to the sweep flag in the grading comment above. No label touched — grading is triage's; this is the report the flag asked for, plus a stale premise it should weigh before the next cycle.

The two named founding members are both already landed

The flag names "this card and the #7887/#7816 narrowed ask" as founding members. That ask shipped today, and so did two siblings that were not on the list:

Member	Landed as	What it did
#7887's narrowed ask (readonly/disabled vocabulary pointer)	PR #8199, merged	FormSectionSchema / PageComponentSchema got the editability-boundary prescription pointing at field-level readonly / readonlyWhen
#8202 + #8201	PR #8339, merged	per-shape surface strings so the three view/page shapes each name themselves; SelectOptionSchema inherited the boundary with its own prescription
#8382	PR #8415, merged	page:tabs items and ScreenFieldConfig got visible / showWhen (and, on the tab item, visibility / visibleOn) pointers at visibleWhen

So the sweep the flag is asking for has largely already run, card by card, over the last twelve hours. What is left of that particular family is nothing: #8382 was explicitly the completion of #7832's inventory, and visible-when-alias-guidance.test.ts is now the enumerated answer-map for every shape in it.

And the remaining member is a different family

This card is about currency → currencyConfig.defaultCurrency on FieldSchema. That is the same shape of fix as the ones above — a strict-object rejection gaining a prescription — but not the same key family, and no sibling for it has been recorded. A sweep card opened today would have exactly one real member.

Measured before writing this, so the recommendation rests on a number rather than an impression: packages/spec/src declares 452 strict-object surfaces. Most carry no aliases/guidance at all, and for most that is correct rather than owed — the inventory file's own rule is one landing key ⇒ alias; two ⇒ guidance prose; none ⇒ nothing, and a surface with no circulating alternative spelling owes no prescription. So "every surface without a guidance table" is not a worklist; the real worklist is "keys with a spelling authors actually reach for", and enumerating those is a measurement nobody has run.

Recommendation

Promote this card standalone — which is this grading's own stated exit ("if no sweep exists … promote this one standalone rather than letting it age further"). Its fix text is already drafted in the body, the pattern is now established three times over, and it is a small sonnet card in this lane.

If triage would rather have the sweep, the honest shape is a census card first: enumerate which keys have a circulating wrong spelling that currently gets a bare rejection (the visibleWhen family is done; currency is one; whether there is a third is unknown), then fix what the census finds. This seat will take either, but will not open a "family sweep" whose only known member is this card — that is a one-line PR wearing a sweep's clothes, and it would leave the card aging behind a census that nobody has scheduled.

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