diff --git a/Data/lib/functions/getSaveDatum.ts b/Data/lib/functions/getSaveDatum.ts
index 76ba85a8..7169ccfb 100644
--- a/Data/lib/functions/getSaveDatum.ts
+++ b/Data/lib/functions/getSaveDatum.ts
@@ -54,7 +54,9 @@ export default function getSaveDatum({
       | [
           T,
           string,
-          (d: DataMeta<T> & { [key: string]: unknown }) => Partial<DataType<T>>,
+          (
+            d: Readonly<DataMeta<T> & { [key: string]: unknown }>,
+          ) => Partial<DataType<T>>,
         ],
     options: {
       noTouch?: boolean;
@@ -171,7 +173,7 @@ export default function getSaveDatum({
           const existingData = await getDatum(type, id);
           if (!existingData) throw new Error(`Data not found: ${type} ${id}`);
 
-          const updatedData = updater(JSON.parse(JSON.stringify(existingData)));
+          const updatedData = updater(existingData);
           const dataToSave: DataMeta<T> & { [key: string]: unknown } = {
             ...(existingData
               ? (Object.fromEntries(
diff --git a/Data/lib/types.ts b/Data/lib/types.ts
index 030f4d58..767748cd 100644
--- a/Data/lib/types.ts
+++ b/Data/lib/types.ts
@@ -131,7 +131,9 @@ export type SaveDatum = <T extends DataTypeName>(
     | [
         T,
         string,
-        (d: DataMeta<T> & { [key: string]: unknown }) => Partial<DataType<T>>,
+        (
+          d: Readonly<DataMeta<T> & { [key: string]: unknown }>,
+        ) => Partial<DataType<T>>,
       ],
   options?: {
     /** Set to true to not update the `__updated_at` field. */
diff --git a/packages/data-storage-couchdb/lib/__tests__/data-storage-couchdb.test.ts b/packages/data-storage-couchdb/lib/__tests__/data-storage-couchdb.test.ts
index d2eef3e1..b87e8852 100644
--- a/packages/data-storage-couchdb/lib/__tests__/data-storage-couchdb.test.ts
+++ b/packages/data-storage-couchdb/lib/__tests__/data-storage-couchdb.test.ts
@@ -1654,40 +1654,40 @@ describe('saveDatum', () => {
       });
     });
 
-    it('updates the datum while the updater function directly assigns new value to the datum', async () => {
-      await withContext(async context => {
-        const d = new CouchDBData(context);
-
-        const collection = await d.saveDatum({
-          __type: 'collection',
-          name: 'Collection',
-          icon_name: 'box',
-          icon_color: 'gray',
-          collection_reference_number: '1',
-        });
-
-        const item = await d.saveDatum({
-          __type: 'item',
-          collection_id: collection.__id,
-          name: 'Item',
-          icon_name: 'cube-outline',
-          icon_color: 'gray',
-        });
-
-        await d.saveDatum([
-          'item',
-          item.__id || '',
-          datum => {
-            datum.name = 'Updated Item';
-            return datum;
-          },
-        ]);
-
-        expect((await d.getDatum('item', item.__id || ''))?.name).toBe(
-          'Updated Item',
-        );
-      });
-    });
+    // it('updates the datum while the updater function directly assigns new value to the datum', async () => {
+    //   await withContext(async context => {
+    //     const d = new CouchDBData(context);
+
+    //     const collection = await d.saveDatum({
+    //       __type: 'collection',
+    //       name: 'Collection',
+    //       icon_name: 'box',
+    //       icon_color: 'gray',
+    //       collection_reference_number: '1',
+    //     });
+
+    //     const item = await d.saveDatum({
+    //       __type: 'item',
+    //       collection_id: collection.__id,
+    //       name: 'Item',
+    //       icon_name: 'cube-outline',
+    //       icon_color: 'gray',
+    //     });
+
+    //     await d.saveDatum([
+    //       'item',
+    //       item.__id || '',
+    //       datum => {
+    //         datum.name = 'Updated Item';
+    //         return datum;
+    //       },
+    //     ]);
+
+    //     expect((await d.getDatum('item', item.__id || ''))?.name).toBe(
+    //       'Updated Item',
+    //     );
+    //   });
+    // });
 
     it('returns the saved datum', async () => {
       await withContext(async context => {