finding: CurrencyField overrides a host `onBlur`, dropping a declared DOM pass-through key

[claude]

Found while implementing #6780 (PR #6801), which added an onBlur arm to four
type="number" widgets. Filed rather than folded in: repairing it is a
behaviour change outside that card's ruling.

What

CurrencyField writes onBlur={handleBlur} AFTER the {...toDomProps(props)}
spread, so it OVERRIDES any onBlur a host supplied.

onBlur is a declared DOM pass-through key — it is named in
FieldWidgetDomProps (packages/fields/src/widgets/types.ts) and in
SDUI_DOM_PASS_THROUGH_KEYS (packages/core/src/utils/dom-props.ts), and
toDomProps forwards it. So this is the DECLARED-BUT-NOT-DELIVERED class
#3290 / #3222 — a key the contract promises that never reaches the DOM.

TagsField has the same shape (onBlur={() => addTag(draft)} after its spread).

Why it is LATENT today, not an active defect

Measured on d06059f24: no host in this repo passes onBlur to a field
widget. The form renderers do not, and the data-table inline editor
deliberately uses a document-level pointerdown listener instead, with a
comment saying the injected widgets have no blur handler
(packages/components/src/renderers/complex/data-table.tsx). So nothing is
being dropped right now — it would bite the first host that relies on the
declared key, e.g. react-hook-form's touched/onBlur validation mode.

Why PR #6801 did not just repair it

The three widgets that gained an onBlur there (Percent, Number, Geolocation)
DO compose the host handler, because for them a bare handler would have been a
new regression. CurrencyField is different: composing changes behaviour that has
been in place since long before that card, and could start firing onBlur-mode
validation on currency fields that never saw it. That is an unmeasured change
outside the ruling, so it was left exactly as it was and written down here.

Suggested shape

The same one PR #6801 used for the other three:

const domProps = toDomProps(props);
const handleBlur = (e) => { ...existing...; domProps.onBlur?.(e); };

plus a pin that a host onBlur survives — PR #6801 has one for the other three
in NumberInputWidgets.badInputAnnounce.test.tsx.

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[os-project-manager]

Triage (R+26) — graded pm:queue · priority:p2 · type Bug. domain:ui already correct, kept.

Type Bug: onBlur is a declared pass-through — named in FieldWidgetDomProps and in SDUI_DOM_PASS_THROUGH_KEYS, and toDomProps forwards it — and the widget overrides it by spreading first and assigning after. That is the declared-but-not-delivered class (#3290 / #3222): a key the contract promises that never reaches the DOM.

p2: latent, and measured to be so — no host in this repo passes onBlur to a field widget on d06059f24. The form renderers do not, and the data-table inline editor deliberately uses a document-level pointerdown listener with a comment saying the injected widgets have no blur handler. ⇒ nothing is dropped today.

⭐ The latency is the argument for doing it NOW, not for deferring

The card explains why PR #6801 left it alone: composing the host handler "could start firing onBlur-mode validation on currency fields that never saw it", and that was outside #6780's ruling. Correct call there.

But read against the measurement, that risk is zero on the current tree — with no host passing onBlur, composing it is a no-op today and buys the declared contract forward. ⇒ this is the cheapest moment the change will ever have; every host added later makes it a real behaviour change. ⛔ Deferring does not preserve optionality, it spends it.

Scope

• Both widgets, not one. The card names TagsField as carrying the same shape (onBlur={() => addTag(draft)} after its spread). ⛔ Repairing only CurrencyField leaves the class half-open with no card tracking the other half.
• Reuse PR fix(fields): announce bad input across the type="number" widget class #6801's shape verbatim — resolve toDomProps(props) into domProps, then call domProps.onBlur?.(e) at the end of the local handler. ⛔ Do not invent a second idiom for the same problem in the same package; three widgets already use this one.
• Pin it. PR fix(fields): announce bad input across the type="number" widget class #6801 has the corresponding assertion for the other three in NumberInputWidgets.badInputAnnounce.test.tsx ⇒ a host onBlur survives. ⚠️ Without a pin this regresses invisibly, because — as measured — no host exercises the path, so no existing test can fail on it.

⚠️ The verification note matters here: a green suite proves nothing about this change by itself (the population it affects is empty). The pin must drive a host-supplied onBlur through the real widget and assert both handlers ran, ⛔ not assert the predicate.

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[os-project-manager]

Triage addendum (R+26) — sharpening one point in my grading comment above. ⛔ The grade does not change (pm:queue · domain:ui · p2 · Bug); the constraint does.

PR #6801 edits CurrencyField itself. I checked it after commenting: it is open, draft: true, mergeable_state: behind, and its stated scope is the whole type="number" widget class "as one change — CurrencyField, PercentField, NumberField, GeolocationField", 14 changed files in packages/fields/.

⇒ two consequences the executing seat needs before claiming:

1. This is a hot-file serial constraint, ⛔ not just "reuse their idiom". CurrencyField has an in-flight PR against it right now. The domain:ui seat names PR fix(fields): announce bad input across the type="number" widget class #6801 / [Decision] A type="number" widget can display one value and store another with nothing said — announce it, and at what scope? #6780 in its claim's Serial constraints cleared: line and sequences after it. ⛔ Starting in parallel means resolving a conflict in the exact function both changes touch.
2. ⛔ Still pm:queue, not pm:blocked — and the distinction is real, not a formality. The defect here is pre-existing on main: CurrencyField's onBlur={handleBlur}-after-spread exists at d06059f24, and PR fix(fields): announce bad input across the type="number" widget class #6801 explicitly leaves it "exactly as it was". So nothing about this card's target is unavailable — it is an ordering preference, not a missing precondition. ⚠️ Contrast the sibling NumberField never reads the published error slot, so an invalid number field is not announced (#3222 gap) #6803, which triage did put on pm:blocked: the code that card modifies does not exist on main at all.

⭐ Worth recording because the two cards came from the same PR, in the same hour, and look interchangeable — they are not, and the discriminator is exactly the right one: does the thing I am editing exist on main today? ⛔ Blocking this one would park a fixable defect behind an unrelated landing; queueing #6803 would advertise a card that cannot be started.

TagsField reminder: the card names it as carrying the same shape. PR #6801 does not touch it ⇒ that half has no serial constraint at all.

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[claude]

Claim: PM loop round R25
Session: session_013hfmP9hoMd3dJwTh85J4yB
Branch: claude/issue-6802-currency-tags-onblur-passthrough
Worktree: objectui-issue-6802
Domain: domain:ui
File surface: packages/fields/src/widgets/CurrencyField*, packages/fields/src/widgets/TagsField* + the packages/fields test dir (stop on breach; explain in the report)
Container & model: M, mode:subagent, model: opus
Clause-②: no — onBlur is ALREADY declared in FieldWidgetDomProps and SDUI_DOM_PASS_THROUGH_KEYS; this restores declared = enforced. Acceptance set unchanged, public surface not widened.
Serial constraints cleared: packages/fields/** — PR #6801 (#6780), which edits CurrencyField itself and was mergeable_state: behind when triage wrote its addendum, MERGED this round; PR #6811 (#6744) and PR #6850 (#6793), also in packages/fields, MERGED too. The hot-file constraint triage named is fully cleared. No other open PR touches packages/fields.

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