diff --git a/.changeset/olive-donkeys-repeat.md b/.changeset/olive-donkeys-repeat.md
new file mode 100644
index 0000000000..bcb5a5111d
--- /dev/null
+++ b/.changeset/olive-donkeys-repeat.md
@@ -0,0 +1,16 @@
+---
+"@objectstack/spec": patch
+---
+
+修正未知键「你是不是想写」兜底对 camelCase 键的系统性偏弱 (#4990)
+
+`findClosestMatches()` 此前只把**输入**小写化,**候选不做同样处理**,于是候选键里的每一个大写字母都要额外付一次编辑距离。叠加 `strictUnknownKeyError` 长度相对的预算(短键即 2),短 camelCase 键上一个普通笔误就够不着建议了:`hideOn` 对 `hiddenOn` 真实距离 2、加大写罚分后 3、超预算返回空,而同一个词写成全小写的 `hiddenon` 反而拿得到建议 —— 把键写错大小写的作者,比写对了大小写、只错一两个字母的作者得到更好的诊断。
+
+现在打分对两侧做同样的归一化(大小写 + `-`/空格 → `_`),回显仍用候选的原始拼写。两处附带修正:
+
+- 折叠后距离为 0 的候选(只有大小写之差,例如 `hiddenon` → `hiddenOn`)不再被 `distance > 0` 过滤丢掉 —— 那是兜底能给出的最有把握的一条建议。过滤改为只排除作者逐字写过的那个字符串;顺带修掉一个未被记录的同源缺陷:旧实现会把作者写对的键原样回显成「你是不是想写」。
+- 折叠后打平时,以作者自己写的大小写作为**次级**排序依据(`yxAis` 同时距 `yAxis`、`xAxis` 为 2,大写 A 指向前者)。
+
+由于「TS config keys → camelCase」是全仓约定,这条影响 #4001 战役已落地的每一条未知键错误信息。在全部 325 组真实候选集上按单字符笔误实测:329 例从「没有建议」变为有建议(328 例正确),**0 例失去建议**,31 例改变选中项(30 例更准)。`ui/responsive.zod.ts` 中批 13 为此写的逐例 `hideOn: 'hiddenOn'` alias 已随之退役,其实测值改由 `responsive.test.ts` 的断言保存。
+
+`data/object.zod.ts` 的 `suggestKey` 经核查**不同病**(它本来就对两侧都做了小写化),已补测试锁定,防止两处再次分叉。
diff --git a/packages/spec/src/data/object.test.ts b/packages/spec/src/data/object.test.ts
index 30151d9f4d..13ef210757 100644
--- a/packages/spec/src/data/object.test.ts
+++ b/packages/spec/src/data/object.test.ts
@@ -892,6 +892,34 @@ describe('ObjectSchema.create()', () => {
       expect(message).toContain('#1535');
     });
 
+    // #4990 note 1 asked whether this file's own `suggestKey` shares the
+    // camelCase weakness that `findClosestMatches` had. It does NOT: it already
+    // lowercases BOTH sides (`editDistance(unknown.toLowerCase(),
+    // key.toLowerCase())`), so a declared key's capitals were never charged to
+    // the author here. Pinning it means the two suggesters cannot drift apart
+    // again — this is the property #4990 fixed in the other one.
+    it('suggestKey judges a typo identically in either case (#4990 note 1)', () => {
+      const bullet = (key: string): string => {
+        try {
+          ObjectSchema.create({
+            name: 'demo',
+            fields: {},
+            [key]: 1,
+          } as Record<string, unknown> as Parameters<typeof ObjectSchema.create>[0]);
+        } catch (e) {
+          return ((e as Error).message.split('\n').find((l) => l.trim().startsWith('•')) ?? '').trim();
+        }
+        throw new Error(`expected ObjectSchema.create to reject \`${key}\``);
+      };
+      // A camelCase key the fallback CAN reach, and its all-lowercase twin:
+      // both must land on the same canonical key.
+      expect(bullet('nameFeild')).toContain('did you mean `nameField`');
+      expect(bullet('namefeild')).toContain('did you mean `nameField`');
+      // And one it cannot reach — the verdict must again not depend on case.
+      expect(bullet('primaryFeild')).not.toContain('did you mean');
+      expect(bullet('primaryfeild')).not.toContain('did you mean');
+    });
+
     // Tombstones: a RETIRED key's rejection must carry the upgrade
     // prescription — the compile/validation error is the one channel every
     // upgrading consumer (human or agent) is guaranteed to hit.
diff --git a/packages/spec/src/shared/suggestions.test.ts b/packages/spec/src/shared/suggestions.test.ts
index 54297688a5..821e1d2116 100644
--- a/packages/spec/src/shared/suggestions.test.ts
+++ b/packages/spec/src/shared/suggestions.test.ts
@@ -58,6 +58,120 @@ describe('findClosestMatches', () => {
   });
 });
 
+describe('camelCase parity in the distance fallback (#4990)', () => {
+  // The budget `strictUnknownKeyError` actually spends. Reproduced rather than
+  // imported because the point of these tests is the INTERACTION between the
+  // budget and the scoring — a test that shared the constant could not show it.
+  const budget = (key: string) => Math.max(2, Math.floor(key.length / 3));
+  const suggest = (input: string, cands: readonly string[]): string | undefined =>
+    findClosestMatches(input, cands, budget(input), 1)[0];
+
+  it('re-measures the four rows the issue tabled, at their real budgets', () => {
+    // Before the fix, row 1 was `[]`: `hideOn` scored 3 against a budget of 2,
+    // because `hiddenOn`'s capital O was charged to the author as an edit.
+    expect(suggest('hideOn', ['hiddenOn'])).toBe('hiddenOn');
+    expect(suggest('hiddenon', ['hiddenOn'])).toBe('hiddenOn');
+    expect(suggest('hiddenOnn', ['hiddenOn'])).toBe('hiddenOn');
+    expect(suggest('maxLenght', ['maxLength'])).toBe('maxLength');
+  });
+
+  // THE INVARIANT, and the substance of #4990.
+  //
+  // Stating it took one correction worth recording. The issue phrases it as
+  // "the all-lowercase form must not get a better suggestion than the correctly
+  // cased one", and the obvious encoding — compare `suggest(T)` with
+  // `suggest(T.toLowerCase())` — is VACUOUS against the buggy code, which
+  // lowercased the input as its first act: both calls collapsed to the same
+  // one and agreed trivially, on 462 probes, while the bug was fully present.
+  //
+  // The asymmetry is not between two spellings of the INPUT. It is between two
+  // spellings of the DECLARED KEY: the identical typo was judged one way
+  // against `hiddenOn` and another against `hiddenon`, because only the
+  // candidate kept its capitals and each one cost the author an edit. That is
+  // the title's "systematically weak on camelCase keys", and it is what this
+  // pins: a key's capitalisation must not change the verdict on a typo.
+  //
+  // Measured against the pre-fix implementation, this corpus breaks parity 55
+  // times in 462 probes — in BOTH directions (`bordeRradius` resolved against
+  // camelCase `borderRadius` but not against flat `borderradius`, the capital
+  // paying off by luck). Case must decide nothing either way.
+  it('judges a typo the same whether the declared key is camelCase or flat', () => {
+    const corpus = [
+      'hiddenOn', 'maxLength', 'iteratorVariable', 'primaryField', 'defaultValue',
+      'borderRadius', 'customVars', 'referenceTo', 'maxIterations', 'displayName',
+      'onDelete', 'sortOrder', 'isRequired', 'allowedPaths', 'triggerPhrases',
+      'xAxis', 'viewName', 'pluginId',
+    ];
+    const failures: string[] = [];
+    for (const key of corpus) {
+      const flat = key.toLowerCase();
+      // How an author actually mistypes: dropped character, swapped pair,
+      // dropped pair — spelled with the camelCase they were aiming for.
+      const variants = new Set<string>();
+      for (let i = 1; i < key.length; i++) variants.add(key.slice(0, i) + key.slice(i + 1));
+      for (let i = 1; i < key.length - 1; i++) {
+        variants.add(key.slice(0, i) + key[i + 1] + key[i] + key.slice(i + 2));
+        variants.add(key.slice(0, i) + key.slice(i + 2));
+      }
+      variants.delete(key);
+      for (const typo of variants) {
+        // Skip the degenerate comparison: when the typo lowercases to the flat
+        // key itself (`bordeRradius` → `borderradius`), the flat side is the
+        // author echoing their own string and is correctly refused, while the
+        // camelCase side is a real — and maximally confident — suggestion.
+        // That asymmetry is the self-match rule, not a case-parity break.
+        if (typo.toLowerCase() === flat) continue;
+        const againstCamel = suggest(typo, [key]) === key;
+        const againstFlat = suggest(typo.toLowerCase(), [flat]) === flat;
+        if (againstCamel !== againstFlat) {
+          failures.push(
+            `${key}: '${typo}' resolves=${againstCamel} but flat '${flat}' resolves=${againstFlat}`,
+          );
+        }
+      }
+    }
+    expect(
+      failures,
+      `a declared key's capitalisation changed the verdict:\n${failures.join('\n')}`,
+    ).toEqual([]);
+  });
+
+  // The issue's own headline comparison, kept as a named case because it is the
+  // sentence the bug was reported in: the author who wrote the key ALL LOWERCASE
+  // was served better than the author who cased it right and slipped two letters.
+  it('serves the correctly-cased author no worse than the all-lowercase one', () => {
+    expect(suggest('hiddenon', ['hiddenOn'])).toBe('hiddenOn'); // was already fine
+    expect(suggest('hideOn', ['hiddenOn'])).toBe('hiddenOn');   // was `undefined`
+  });
+
+  it('suggests a candidate that differs from the input ONLY in case', () => {
+    // Folding both sides makes such a candidate distance 0, and the old
+    // `distance > 0` filter discarded it along with the true self-match. It is
+    // the single most confident suggestion the fallback can make.
+    expect(suggest('hiddenon', ['hiddenOn'])).toBe('hiddenOn');
+    expect(suggest('MAXLENGTH', ['maxLength'])).toBe('maxLength');
+    expect(suggest('reference_to', ['referenceTo'])).toBe('referenceTo');
+  });
+
+  it('still refuses to echo back the exact string the author typed', () => {
+    expect(findClosestMatches('maxLength', ['maxLength', 'minLength'], 3, 3))
+      .not.toContain('maxLength');
+  });
+
+  it('breaks a folded tie on the author\'s own capitalisation', () => {
+    // `allowedaPths` is equidistant from `allowedPaths` and `allowedAPIs` once
+    // case is folded away. The capitals the author did type are the only
+    // evidence left, and they point at `allowedPaths`.
+    expect(suggest('allowedaPths', ['allowedAPIs', 'allowedPaths'])).toBe('allowedPaths');
+  });
+
+  it('leaves genuinely unrelated keys unsuggested — the fold is not a widening', () => {
+    const keys = ['hiddenOn', 'columns', 'order', 'breakpoint'];
+    expect(suggest('workflows', keys)).toBeUndefined();
+    expect(suggest('responsiveStyles', keys)).toBeUndefined();
+  });
+});
+
 describe('suggestFieldType', () => {
   it('should suggest via alias map for common alternatives', () => {
     expect(suggestFieldType('string')).toEqual(['text']);
diff --git a/packages/spec/src/shared/suggestions.zod.ts b/packages/spec/src/shared/suggestions.zod.ts
index ab875575fc..6d48bcf444 100644
--- a/packages/spec/src/shared/suggestions.zod.ts
+++ b/packages/spec/src/shared/suggestions.zod.ts
@@ -52,9 +52,28 @@ export function levenshteinDistance(a: string, b: string): number {
   return prev[lb];
 }
 
+/**
+ * Fold away the differences an author is *never* signalling with: letter case
+ * and the dash/space spellings of an underscore separator.
+ *
+ * Applied to BOTH sides of the comparison in {@link findClosestMatches}. Folding
+ * only the input was a real defect (#4990): candidates are camelCase across most
+ * of the spec (AGENTS.md Prime Directive #3, "TS config keys → camelCase"), so
+ * every capital in a declared key charged the author one extra substitution
+ * against a budget that is only `max(2, len/3)`. The observable symptom was
+ * inverted quality — `hiddenon` (all-lowercase, plain wrong) resolved to
+ * `hiddenOn` at distance 1, while `hideOn` (correctly cased, one real typo)
+ * scored 3 against a budget of 2 and got no suggestion at all.
+ */
+const foldForScoring = (value: string): string => value.toLowerCase().replace(/[-\s]/g, '_');
+
 /**
  * Find the closest matches from a list of candidates.
  *
+ * Scoring is case- and separator-insensitive on both sides; the returned
+ * strings are the candidates' ORIGINAL spelling, because that spelling is what
+ * the author has to type back.
+ *
  * @param input - The user-provided (possibly invalid) value
  * @param candidates - Array of valid values to compare against
  * @param maxDistance - Maximum edit distance to consider (default: 3)
@@ -67,15 +86,28 @@ export function findClosestMatches(
   maxDistance = 3,
   maxResults = 3,
 ): string[] {
-  const normalized = input.toLowerCase().replace(/[-\s]/g, '_');
+  const normalized = foldForScoring(input);
 
   const scored = candidates
     .map((candidate) => ({
       value: candidate,
-      distance: levenshteinDistance(normalized, candidate),
+      distance: levenshteinDistance(normalized, foldForScoring(candidate)),
+      // Tie-break only. Folding is right for RANKING (case is not what the
+      // author meant to signal), but when two declared keys are equidistant
+      // under the fold the author's own capitalisation is the last piece of
+      // evidence left about which one they were reaching for — `yxAis` ties
+      // `yAxis` and `xAxis` at 2 folded, and the capital A picks the intended
+      // one. Kept strictly secondary so it can never resurrect the #4990 bug
+      // of case outranking a real edit.
+      cased: levenshteinDistance(input, candidate),
     }))
-    .filter((s) => s.distance <= maxDistance && s.distance > 0)
-    .sort((a, b) => a.distance - b.distance);
+    // Drop only the candidate the author ALREADY typed verbatim — suggesting a
+    // string back to the author who wrote it is noise. A folded distance of 0
+    // on a differently-spelled candidate (`hiddenon` vs `hiddenOn`) is not that
+    // case: it is the strongest suggestion available, and pre-#4990 the
+    // `distance > 0` test threw it away together with the true self-match.
+    .filter((s) => s.distance <= maxDistance && s.value !== input)
+    .sort((a, b) => a.distance - b.distance || a.cased - b.cased);
 
   return scored.slice(0, maxResults).map((s) => s.value);
 }
diff --git a/packages/spec/src/ui/responsive.test.ts b/packages/spec/src/ui/responsive.test.ts
index b8e417694f..772163dbfd 100644
--- a/packages/spec/src/ui/responsive.test.ts
+++ b/packages/spec/src/ui/responsive.test.ts
@@ -190,14 +190,22 @@ describe('unknown keys are rejected, not stripped (#4001 batch 13)', () => {
 
     it('reaches `hiddenOn` from both wrong spellings', () => {
       // `hidden` is objectui's RESOLVED spelling (`useResponsiveConfig` returns
-      // `{ hidden, columns, order, breakpoint }`). `hideOn` is the same word,
-      // and the distance fallback measurably cannot reach it — it lowercases
-      // the input but not the candidates, so the capital in `hiddenOn` costs an
-      // extra edit against a budget of 2 (filed as #4990).
+      // `{ hidden, columns, order, breakpoint }`) — a different WORD, which no
+      // edit distance can reach, so it keeps its entry in the alias table.
       expect(unknownKeyIssue(ResponsiveConfigSchema, { hidden: true })!.message)
         .toContain('`hidden` → `hiddenOn`');
+      // `hideOn` is the SAME word and had an alias entry of its own until #4990,
+      // because the fallback charged the author for `hiddenOn`'s capital O:
+      // `hideOn` scored 3 against a budget of 2 and returned nothing, while the
+      // all-lowercase `hiddenon` scored 1 and resolved. #4990 folds case on both
+      // sides, so the alias was retired and this now rides the fallback alone.
+      // These two assertions ARE batch 13's measurement, kept executable — the
+      // first fails if the general fix regresses, the second is the comparison
+      // that made the old behaviour indefensible.
       expect(unknownKeyIssue(ResponsiveConfigSchema, { hideOn: ['xs'] })!.message)
         .toContain('`hideOn` → `hiddenOn`');
+      expect(unknownKeyIssue(ResponsiveConfigSchema, { hiddenon: ['xs'] })!.message)
+        .toContain('`hiddenon` → `hiddenOn`');
     });
   });
 
diff --git a/packages/spec/src/ui/responsive.zod.ts b/packages/spec/src/ui/responsive.zod.ts
index ffe159f882..e83631d492 100644
--- a/packages/spec/src/ui/responsive.zod.ts
+++ b/packages/spec/src/ui/responsive.zod.ts
@@ -206,16 +206,17 @@ export const ResponsiveConfigSchema = lazySchema(() => strictObject(
       // `useResponsiveConfig.ts`). `hidden` is that RESULT's spelling of the
       // authored `hiddenOn`, which is where the wrong word comes from.
       hidden: 'hiddenOn',
-      // `hideOn` is not a different word — it is the SAME word, and the
-      // distance fallback still cannot reach it. Measured, not assumed:
-      // `findClosestMatches('hideOn', ['hiddenOn'], 2)` returns `[]`, because
-      // the fallback lowercases the INPUT but not the CANDIDATES, so every
-      // capital in a declared key costs one extra edit — `hideOn` scores 3
-      // against a budget of 2 while the all-lowercase `hiddenon` scores 1 and
-      // resolves fine. That asymmetry is general to camelCase keys (i.e. to
-      // most of the spec, per AGENTS.md naming) and is filed as #4990; this
-      // entry covers the one instance this file owns.
-      hideOn: 'hiddenOn',
+      // `hideOn` USED to need an entry here. It is not a different word — it is
+      // the same word, and the distance fallback could not reach it only
+      // because of #4990: the fallback lowercased the INPUT but not the
+      // CANDIDATES, so `hiddenOn`'s capital O cost an extra edit and `hideOn`
+      // scored 3 against a budget of 2, while the all-lowercase `hiddenon`
+      // scored 1 and resolved fine. #4990 fixed that at the source by folding
+      // case on both sides, so this per-case workaround is retired: `hideOn`
+      // now reaches `hiddenOn` on distance alone. The measurement that
+      // justified the entry is preserved as an assertion in `responsive.test.ts`
+      // ("reaches `hiddenOn` from both wrong spellings") rather than as a
+      // comment, so it fails if the general fix ever regresses.
     },
     guidance: {
       ...BREAKPOINT_AT_TOP_LEVEL,