diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 64bf7365..9730654f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -22,27 +22,27 @@ jobs:
         node:
           - lts/gallium
           - node
-  canary:
-    name: canary / ${{matrix.package}}
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
-        with:
-          node-version: node
-      - run: npm install
-      - run: npm run build
-      - uses: actions/checkout@v3
-        with:
-          repository: ${{matrix.package}}
-          path: canary/${{matrix.package}}
-      - run: npm install && npx rimraf "node_modules/**/unified" && npm test
-        working-directory: canary/${{matrix.package}}
-    strategy:
-      fail-fast: false
-      matrix:
-        package:
-          - rehypejs/rehype
-          - remarkjs/remark
-          - retextjs/retext
-          - unifiedjs/unified-engine
+  # canary:
+  #   name: canary / ${{matrix.package}}
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - uses: actions/checkout@v3
+  #     - uses: actions/setup-node@v3
+  #       with:
+  #         node-version: node
+  #     - run: npm install
+  #     - run: npm run build
+  #     - uses: actions/checkout@v3
+  #       with:
+  #         repository: ${{matrix.package}}
+  #         path: canary/${{matrix.package}}
+  #     - run: npm install && npx rimraf "node_modules/**/unified" && npm test
+  #       working-directory: canary/${{matrix.package}}
+  #   strategy:
+  #     fail-fast: false
+  #     matrix:
+  #       package:
+  #         - rehypejs/rehype
+  #         - remarkjs/remark
+  #         - retextjs/retext
+  #         - unifiedjs/unified-engine
diff --git a/lib/index.js b/lib/index.js
index 97c4a581..abe9d8ca 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -346,8 +346,8 @@
  *   be stored on the `result` field of {@link VFile `VFile`}.
  */
 
-import structuredClone from '@ungap/structured-clone'
 import {bail} from 'bail'
+import extend from 'extend'
 import {ok as assert} from 'devlop'
 import isPlainObj from 'is-plain-obj'
 import {trough} from 'trough'
@@ -507,7 +507,7 @@ export class Processor extends CallableInstance {
       destination.use(...attacher)
     }
 
-    destination.data(structuredClone(this.namespace))
+    destination.data(extend(true, {}, this.namespace))
 
     return destination
   }
@@ -1115,10 +1115,7 @@ export class Processor extends CallableInstance {
       addList(result.plugins)
 
       if (result.settings) {
-        namespace.settings = {
-          ...namespace.settings,
-          ...structuredClone(result.settings)
-        }
+        namespace.settings = extend(true, namespace.settings, result.settings)
       }
     }
 
@@ -1166,7 +1163,7 @@ export class Processor extends CallableInstance {
         let [primary, ...rest] = parameters
         const currentPrimary = attachers[entryIndex][1]
         if (isPlainObj(currentPrimary) && isPlainObj(primary)) {
-          primary = structuredClone({...currentPrimary, ...primary})
+          primary = extend(true, currentPrimary, primary)
         }
 
         attachers[entryIndex] = [plugin, primary, ...rest]
diff --git a/package.json b/package.json
index ca2d7187..5d6b0708 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "unified",
-  "version": "11.0.2",
+  "version": "11.0.3",
   "description": "parse, inspect, transform, and serialize content through syntax trees",
   "license": "MIT",
   "keywords": [
@@ -46,23 +46,23 @@
   ],
   "dependencies": {
     "@types/unist": "^3.0.0",
-    "@ungap/structured-clone": "^1.0.0",
     "bail": "^2.0.0",
     "devlop": "^1.0.0",
+    "extend": "^3.0.0",
     "is-plain-obj": "^4.0.0",
     "trough": "^2.0.0",
     "vfile": "^6.0.0"
   },
   "devDependencies": {
+    "@types/extend": "^3.0.0",
     "@types/hast": "^3.0.0",
     "@types/mdast": "^4.0.0",
     "@types/node": "^20.0.0",
-    "@types/ungap__structured-clone": "^0.3.0",
     "c8": "^8.0.0",
     "prettier": "^3.0.0",
     "remark-cli": "^11.0.0",
     "remark-preset-wooorm": "^9.0.0",
-    "tsd": "^0.28.0",
+    "tsd": "^0.29.0",
     "type-coverage": "^2.0.0",
     "typescript": "^5.0.0",
     "xo": "^0.56.0"
diff --git a/readme.md b/readme.md
index ff81003c..ae0b67fe 100644
--- a/readme.md
+++ b/readme.md
@@ -1666,7 +1666,7 @@ work on [`ware`][ware], as it was a huge initial inspiration.
 
 [downloads]: https://www.npmjs.com/package/unified
 
-[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=unified
+[size-badge]: https://img.shields.io/bundlejs/size/unified
 
 [size]: https://bundlejs.com/?q=unified
 
diff --git a/test/data.js b/test/data.js
index 6b8df6c2..7d80ce1f 100644
--- a/test/data.js
+++ b/test/data.js
@@ -39,4 +39,15 @@ test('`data`', async function (t) {
       baz: 'qux'
     })
   })
+
+  await t.test('should support functions in data', async function () {
+    const fn = unified().data('fn', func)().data('fn')
+
+    assert(typeof fn === 'function')
+    assert.equal(fn, func)
+
+    function func() {
+      return 'alpha'
+    }
+  })
 })
diff --git a/test/types.d.ts b/test/types.d.ts
index faec71de..03c3e6fd 100644
--- a/test/types.d.ts
+++ b/test/types.d.ts
@@ -3,6 +3,7 @@ declare module 'unified' {
     baz?: 'qux' | undefined
     foo?: 'bar' | undefined
     x?: boolean | undefined
+    fn?: Function | undefined
   }
 
   interface Settings {