diff --git a/CHANGELOG.yml b/CHANGELOG.yml
index c4c06cb..1dbc0cf 100644
--- a/CHANGELOG.yml
+++ b/CHANGELOG.yml
@@ -6,22 +6,26 @@ project:
   ticket_url: ~
   with_stats: true
 releases:
+  - version: NEXT
+    date: ~
+    changes:
+      - desc: check for array deep equality
   - version: v2.1.1
     date: 2023-02-22
     changes:
       - desc: add map to the exports
-      - desc: 'code churn: 4 files changed, 134 insertions(+), 121 deletions(-)'
+      - desc: "code churn: 4 files changed, 134 insertions(+), 121 deletions(-)"
         type: stats
   - version: v2.1.0
     date: 2023-00-13
     changes:
       - desc: add function 'matches'
-      - desc: 'code churn: 7 files changed, 66 insertions(+), 174 deletions(-)'
+      - desc: "code churn: 7 files changed, 66 insertions(+), 174 deletions(-)"
         type: stats
   - version: v2.0.0
     date: ~
     changes:
-      - desc: 'Fork from the [mothership](github.com/substantial/updeep), v1.2.1'
+      - desc: "Fork from the [mothership](github.com/substantial/updeep), v1.2.1"
 change_types:
   - keywords:
       - feat
diff --git a/Taskfile.yaml b/Taskfile.yaml
index 65e8e8e..f3bd762 100644
--- a/Taskfile.yaml
+++ b/Taskfile.yaml
@@ -3,9 +3,12 @@
 version: "3"
 
 vars:
-  GREETING: Hello, World!
   VERSION:
     sh: cat package.json | jq -r .version
+  PARENT_BRANCH: main
+  FILE_DELTA:
+    sh: git diff-ls {{.PARENT_BRANCH}}
+  FIX: false
 
 tasks:
   changelog:
@@ -16,6 +19,24 @@ tasks:
 
   test: vitest run
 
+  prettier:
+    cmd: prettier {{if .FIX }}--write{{end}} {{ .FILE_DELTA | catLines }}
+
+  checkout-clean:
+    cmds:
+      - sh: git is-clean
+        msg: stuff not commited
+
+  integrate:
+    deps: [prettier, test, build]
+    cmds:
+      - echo {{ .FILE_DELTA | catLines }} | grep CHANGELOG.yml
+      - sh: git branch | grep '* {{.PARENT_BRANCH}}'
+        msg: not on target
+      - { task: checkout-clean }
+      - git checkout {{.PARENT_BRANCH}}
+      - git weld -
+
   build:
     sources: ["src/**"]
     generates: ["esm/**"]
@@ -25,7 +46,7 @@ tasks:
       - tsc -p tsconfig.json
 
   prepRelease:
-    deps: [changelog, build]
+    deps: [prettier, test, changelog, build]
     preconditions:
       - sh: git branch | grep '* main'
         msg: not on main
@@ -41,8 +62,3 @@ tasks:
       - npm publish --access public
       - git push
       - git push --tags
-
-  default:
-    cmds:
-      - echo "{{.GREETING}}"
-    silent: true
diff --git a/src/update.ts b/src/update.ts
index f935678..6bb44fb 100644
--- a/src/update.ts
+++ b/src/update.ts
@@ -1,5 +1,6 @@
 import wrap from "./wrap.js";
 import constant from "./constant.js";
+import * as R from "remeda";
 
 import { omitBy, isObject, merge } from "remeda";
 
@@ -77,6 +78,8 @@ function update(object, updates) {
     return updates(object);
   }
 
+  if (Array.isArray(object) && R.equals(object, updates)) return object;
+
   if (!isPlainObject(updates)) {
     return updates;
   }
diff --git a/src/updeep.test.ts b/src/updeep.test.ts
index c83862c..c83d650 100644
--- a/src/updeep.test.ts
+++ b/src/updeep.test.ts
@@ -169,3 +169,14 @@ describe("u.skip", () => {
 test("has map", () => {
   expect(u).toHaveProperty("map");
 });
+
+test("deep equality", () => {
+  const orig = [1, 2, 3];
+
+  // no change? same structure
+  expect(u(orig, [1, 2, 3])).toBe(orig);
+
+  const deepOrig = [1, 2, [3, 4]];
+
+  expect(u(deepOrig, [1, 2, [3, 4]])).toBe(deepOrig);
+});