@@ -0,0 +1,18 @@
+---
+'@objectstack/objectql': patch
+---
+
+fix(objectql)!: a string-typed field refuses a Date, a Map, a Set, a class instance or a typed array as its value, as it already refused a plain object or an array (#29645)
+
+Clause-②: no (narrowing)
+Metadata-protocol: none
+
+<!-- adr-0087: not-required (no-migration-prescription) No key of any schema is added, removed, renamed or re-shaped, and no export or type changes: what a metadata author writes is read exactly as before. Only a record write carrying an object of the wrong shape on a text-family field is refused, with the validator's existing invalid_type code and the existing ADR-0104 shape sentence, so there is nothing for objectstack migrate meta to rewrite and no tombstone. Rows already stored are not rewritten by this change, so no stored-row migration is prescribed either. -->
+
+**BREAKING** accept-set narrowing at the record write door (`@objectstack/objectql`), on the engine's insert, insertMany, update by id, update by predicate and the `validate()` dry run. Those are the doors flows, hooks and server code write through; a JSON request body carries none of these values, so REST callers see no change.
+
+- **Before.** The string arm refused a plain object or an array, but its object test was prototype-strict, so any other object passed on its string reading. On a `text`, `textarea`, `password`, `markdown`, `html`, `richtext`, `code`, `signature` or `qrcode` field, driver-memory stored the object itself and SQLite stored a `Date` as its epoch number in TEXT (`"1767312000000.0"`), a `Map` or a `Set` as `"{}"`, and a class instance or a typed array as its JSON text. On `email`, `url` and `phone` the same write was refused, but only because that string failed the format check (`invalid_email`, `invalid_url`, `invalid_phone`).
+- **Now.** Every object is refused `invalid_type` with the sentence `FIELD has an invalid TYPE value: expected a string, received an object`, on all twelve types, before any bound or format is judged, so the three format types now answer `invalid_type` for an object instead of their format code. The driver is never written. A readonly field's value is judged the same way, as a shape check.
+- **Unchanged.** A string. A number and a boolean, which keep their string reading and are stored as that string. `null` and a missing value. A plain object and an array (already refused). A filter-operator object keeps its own earlier refusal sentence. A `json` field and the structured-JSON types still hold any object.
+
+**The remedy.** Write the string you mean: `value.toISOString()` for a `Date` on a text field (or declare the field `datetime`), `JSON.stringify(...)` when JSON text is really what the field should hold, or declare the field `json` when it holds structured data.
@@ -0,0 +1,193 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * [#29645] A string-typed field (`BOUNDED_STRING_FIELD_TYPES`) refuses ANY
+ * object as its value, not only a plain object or an array (#29133).
+ *
+ * Measured on `origin/main` @ `7dae3b3c` before the change, through the engine
+ * (insert, update by id, update by predicate), on SQLite (the physical column)
+ * and on driver-memory (the engine's read; it keeps what it is handed):
+ *
+ *   value on text / textarea / markdown /    base SQLite (stored)   base memory (read)   head
+ *   html / richtext / code / signature /
+ *   qrcode / password
+ *   new Date(…)                              "1767312000000.0"      the Date itself      invalid_type
+ *   new Map(…), new Set(…)                   "{}"                   the Map / the Set    invalid_type
+ *   a class instance { k: 1 }                '{"k":1}'              the instance         invalid_type
+ *   new Uint8Array([1, 2])                   '{"0":1,"1":2}'        the typed array      invalid_type
+ *   value on email / url / phone             invalid_email / _url / _phone (by accident)  invalid_type
+ *
+ * (`password` reads back masked, so its stored column is the only answer.)
+ * The arm's object test was `isPlainObjectValue`, which is prototype-strict,
+ * so these fell through to the string reading; on the three format types that
+ * reading failed the format regex, an accident of `String(value)`. The arm
+ * now asks the option arms' test (`isObjectValue`, #29562), so every object is
+ * refused with the same wire code and sentence as a plain one. A string, a
+ * number and a boolean keep #29241's rule: judged, and stored, as a string.
+ */
+
+import { describe, it, expect } from 'vitest';
+import { BOUNDED_STRING_FIELD_TYPES } from '@objectstack/spec/data';
+import { normalizeNumericStringValues, validateRecord, validateRecordInScope, ValidationError } from './record-validator.js';
+import { ObjectQL } from '../engine.js';
+
+const STRING_TYPES = [...BOUNDED_STRING_FIELD_TYPES];
+
+class Widget {
+  k = 1;
+}
+
+const NON_PLAIN: ReadonlyArray<readonly [string, () => unknown]> = [
+  ['a Date', () => new Date('2026-01-02T00:00:00Z')],
+  ['a Map', () => new Map([['a', 1]])],
+  ['a Set', () => new Set(['a'])],
+  ['a class instance', () => new Widget()],
+  ['a typed array', () => new Uint8Array([1, 2])],
+];
+
+/** A string each type's own format admits: the plain-string control. */
+const CONTROL: Record<string, string> = { email: 'a@b.co', url: 'https://example.com', phone: '+15551234567' };
+const controlFor = (type: string) => CONTROL[type] ?? 'plain';
+
+function errorsOf(
+  schema: { fields: Record<string, any> },
+  data: Record<string, unknown>,
+  mode: 'insert' | 'update',
+) {
+  try {
+    validateRecord(schema, data, mode);
+  } catch (e) {
+    if (e instanceof ValidationError) return e.fields;
+    throw e;
+  }
+  return [];
+}
+
+describe('#29645 — a string-typed field refuses any object, not only a plain one', () => {
+  it('reads the spec set, which still holds the twelve members this pin was written against', () => {
+    expect(STRING_TYPES.sort()).toEqual(
+      ['code', 'email', 'html', 'markdown', 'password', 'phone', 'qrcode', 'richtext', 'signature', 'text', 'textarea', 'url'],
+    );
+  });
+
+  for (const type of STRING_TYPES) {
+    const schema = { fields: { f: { type, label: 'F' } } };
+    for (const [shape, make] of NON_PLAIN) {
+      for (const mode of ['insert', 'update'] as const) {
+        it(`${type}: refuses ${shape} on ${mode} as invalid_type`, () => {
+          const errs = errorsOf(schema, { f: make() }, mode);
+          expect(errs.map((e) => [e.field, e.code])).toEqual([['f', 'invalid_type']]);
+          expect(errs[0].constraint).toMatchObject({ type, detail: 'expected a string, received an object' });
+        });
+      }
+    }
+
+    it(`${type}: control — a plain string still lands`, () => {
+      expect(errorsOf(schema, { f: controlFor(type) }, 'insert')).toEqual([]);
+      expect(errorsOf(schema, { f: controlFor(type) }, 'update')).toEqual([]);
+    });
+  }
+
+  it('says the field, the type and the received shape in the message', () => {
+    const errs = errorsOf({ fields: { title: { type: 'text', label: 'Title' } } }, { title: new Date(0) }, 'insert');
+    expect(errs[0].message).toContain('Title');
+    expect(errs[0].message).toContain('text');
+    expect(errs[0].message).toContain('expected a string, received an object');
+  });
+
+  it('refuses it on a readonly field too (a shape arm, reached under the readonly scope)', () => {
+    const schema = { fields: { stamp: { type: 'text', label: 'Stamp', readonly: true } } };
+    let err: unknown = null;
+    try {
+      validateRecordInScope(schema, { stamp: new Date(0) }, 'insert', 'include');
+    } catch (e) {
+      err = e;
+    }
+    expect(err).toBeInstanceOf(ValidationError);
+    expect((err as ValidationError).fields.map((f) => [f.field, f.code])).toEqual([['stamp', 'invalid_type']]);
+  });
+});
+
+describe('#29645 — what the rule leaves alone', () => {
+  const schema = { fields: { title: { type: 'text', label: 'Title', maxLength: 5 }, payload: { type: 'json', label: 'P' } } };
+
+  it('a number and a boolean keep #29241: written as their string, then judged as one', () => {
+    const row = normalizeNumericStringValues(schema, { title: 42, payload: 1 });
+    expect(row).toEqual({ title: '42', payload: 1 });
+    expect(errorsOf(schema, row, 'insert')).toEqual([]);
+    expect(normalizeNumericStringValues(schema, { title: true }).title).toBe('true');
+    expect(errorsOf(schema, { title: 123456 }, 'insert')[0].code).toBe('max_length');
+  });
+
+  it('the door leaves an object as sent: the arm, not the door, refuses it', () => {
+    const row = { title: new Date(0) };
+    expect(normalizeNumericStringValues(schema, row)).toBe(row);
+  });
+
+  it('a json field still holds a Date or a Map (outside the set)', () => {
+    expect(errorsOf(schema, { payload: new Date(0) }, 'insert')).toEqual([]);
+    expect(errorsOf(schema, { payload: new Map() }, 'insert')).toEqual([]);
+  });
+});
+
+/** The driver-facing half: every engine door reaches the rule and writes nothing. */
+describe('#29645 — write path end to end: the driver is never written', () => {
+  async function boot() {
+    const engine = new ObjectQL();
+    const writes: unknown[] = [];
+    const rows = new Map<string, Record<string, unknown>>([['rec_1', { id: 'rec_1', title: 'orig' }]]);
+    engine.registerDriver({
+      name: 'recording', version: '0.0.0', supports: {},
+      async connect() {}, async disconnect() {}, async checkHealth() { return true; },
+      async execute() { return null; },
+      async find() { return Array.from(rows.values()); },
+      async findOne(_o: string, ast: any) { return rows.get(ast?.where?.id) ?? null; },
+      async create(_o: string, data: unknown) { writes.push(data); return { ...(data as object), id: 'x' }; },
+      async update(_o: string, id: string, data: unknown) { writes.push(data); return { ...(data as object), id }; },
+      async updateMany(_o: unknown, _a: unknown, data: unknown) { writes.push(data); return 0; },
+      async delete() { return true; }, async count() { return rows.size; },
+      async bulkCreate(_o: string, data: unknown[]) { writes.push(...data); return data.map((d, i) => ({ ...(d as object), id: `b${i}` })); },
+      async bulkUpdate() { return []; }, async bulkDelete() {},
+      async beginTransaction() { return { commit: async () => {}, rollback: async () => {} }; },
+      async commit() {}, async rollback() {},
+    } as any, true);
+    await engine.init();
+    engine.registry.registerObject({
+      name: 'text_object', label: 'Text object',
+      fields: {
+        id: { name: 'id', label: 'ID', type: 'text', primaryKey: true },
+        title: { name: 'title', label: 'Title', type: 'text' },
+        mail: { name: 'mail', label: 'Mail', type: 'email' },
+      },
+    } as any);
+    return { engine, writes, rows };
+  }
+
+  it('insert, insertMany, update by id and update by predicate refuse it VALIDATION_FAILED', async () => {
+    const { engine, writes, rows } = await boot();
+    for (const [field, run] of [
+      ['title', () => engine.insert('text_object', { title: new Date(0) } as any)],
+      ['title', () => engine.insert('text_object', [{ title: 'ok' }, { title: new Set(['a']) }] as any)],
+      ['title', () => engine.update('text_object', { title: new Map() } as any, { where: { id: 'rec_1' } } as any)],
+      ['title', () => engine.update('text_object', { title: new Widget() } as any, { multi: true } as any)],
+      ['mail', () => engine.insert('text_object', { mail: new Uint8Array([1]) } as any)],
+    ] as const) {
+      const err = await run().then(() => null, (e: unknown) => e as ValidationError);
+      expect(err).toBeInstanceOf(ValidationError);
+      expect(err!.code).toBe('VALIDATION_FAILED');
+      expect(err!.fields.map((f) => [f.field, f.code])).toEqual([[field, 'invalid_type']]);
+    }
+    expect(writes).toEqual([]);
+    expect(rows.get('rec_1')).toEqual({ id: 'rec_1', title: 'orig' });
+  });
+
+  it('control: a plain string reaches the driver as sent', async () => {
+    const { engine, writes } = await boot();
+    await engine.insert('text_object', { title: 'plain', mail: 'a@b.co' } as any);
+    await engine.update('text_object', { title: 'again' } as any, { where: { id: 'rec_1' } } as any);
+    expect(writes).toEqual([
+      expect.objectContaining({ title: 'plain', mail: 'a@b.co' }),
+      expect.objectContaining({ title: 'again' }),
+    ]);
+  });
+});
@@ -23,8 +23,9 @@
  *                   is refused on every field whose declared value is a SCALAR
  *                   — a `where` clause pasted into the SET half of a write
  *                   (#5922).
- *  - string types   (`BOUNDED_STRING_FIELD_TYPES`) a plain object or an array
- *                   is `invalid_type`, never stringified (#29133); a number or
+ *  - string types   (`BOUNDED_STRING_FIELD_TYPES`) any object (a plain object,
+ *                   an array, a `Date`, a `Map`, a class instance) is
+ *                   `invalid_type`, never stringified (#29133, #29645); a number or
  *                   a boolean is judged, and stored, as its string reading
  *                   (#29241). Then, on that string:
  *    - `maxLength` / `minLength`
@@ -886,16 +887,17 @@ function isPlainObjectValue(value: unknown): boolean {
 
 /**
  * [#29562] Any object: a plain object, an array, a `Date`, a `Map`, a class
- * instance. The option arms' shape test. An option code is a string, and no
- * object has a string reading a caller meant as one (`String(new Date())` is
- * not a code), so the option arms refuse every object rather than only the
- * plain ones {@link isPlainObjectValue} names.
+ * instance. The option arms' shape test, and [#29645] the string arm's. An
+ * option code or a text value is a string, and no object has a string reading
+ * a caller meant as one (`String(new Date())` is neither a code nor a title),
+ * so those arms refuse every object rather than only the plain ones
+ * {@link isPlainObjectValue} names.
  */
 function isObjectValue(value: unknown): value is object {
   return typeof value === 'object' && value !== null;
 }
 
-/** [#29562] The received-shape word an option arm's refusal names. */
+/** [#29562] The received-shape word an option or string arm's refusal names. */
 function receivedObjectShape(value: object): string {
   return Array.isArray(value) ? 'an array' : 'an object';
 }
@@ -969,8 +971,8 @@ function receivedObjectShape(value: object): string {
  * `42`.
  *
  * ⛔ Not touched: a string (judged and written as itself), `null` and a missing
- * key, a plain object or an array (the arm refuses them, #29133), every other
- * non-scalar, and every field outside the set — `json` and the structured
+ * key, an object of any kind (the arm refuses it, #29133 / #29645), every
+ * other non-scalar, and every field outside the set — `json` and the structured
  * types, the number and boolean fields and the reference types. The option
  * types have their own half, below.
  *
@@ -1328,10 +1330,18 @@ function validateOne(
     // [#29241] `normalizeNumericStringValues` has already written that string
     // into the payload at the door, so the driver stores what was judged; a
     // filter-operator object was already refused above, with its own sentence.
-    if (isPlainObjectValue(value) || Array.isArray(value)) {
+    //
+    // [#29645] Every object, not only a plain one, by the option arms' test
+    // (#29562): a `Date`, a `Map`, a `Set`, a class instance or a typed array
+    // passed on its string reading, so driver-memory stored the object itself
+    // and SQLite stored a `Date` as its epoch number and the rest as their
+    // JSON text (`{}` for a `Map` or a `Set`). On `email`, `url` and `phone`
+    // the format check refused that string by accident; the shape is now
+    // refused first, on all twelve types alike. It is never stringified.
+    if (isObjectValue(value)) {
       return fail(
         'invalid_type',
-        { type: t, detail: `expected a string, received ${Array.isArray(value) ? 'an array' : 'an object'}` },
+        { type: t, detail: `expected a string, received ${receivedObjectShape(value)}` },
         // The ADR-0104 shape sentence the operator refusal above also uses:
         // one catalog entry for "this value's SHAPE is wrong for this type".
         'invalid_value_shape',