diff --git a/TODO.md b/TODO.md
index e7b94d815a..8f9761222f 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,8 +2,8 @@
 - https://github.com/preactjs/preact/pull/4358
 - https://github.com/preactjs/preact/pull/4361
 - https://github.com/preactjs/preact/pull/4460
-- https://github.com/preactjs/preact/pull/4453
 - Backing VNodes
+- Enable removing classes from the bundle
 - Remove deprecated lifecycle methods
 - Try to get rid of DOM pointers
 - Separate mount/update paths
diff --git a/compat/src/index.d.ts b/compat/src/index.d.ts
index bc066c39df..eb4f659796 100644
--- a/compat/src/index.d.ts
+++ b/compat/src/index.d.ts
@@ -774,11 +774,6 @@ declare namespace React {
 	export function flushSync<R>(fn: () => R): R;
 	export function flushSync<A, R>(fn: (a: A) => R, a: A): R;
 
-	export function unstable_batchedUpdates(
-		callback: (arg?: any) => void,
-		arg?: any
-	): void;
-
 	export type PropsWithChildren<P = unknown> = P & {
 		children?: preact.ComponentChildren | undefined;
 	};
diff --git a/compat/src/index.js b/compat/src/index.js
index ab3bf03b3a..38cb891275 100644
--- a/compat/src/index.js
+++ b/compat/src/index.js
@@ -116,16 +116,6 @@ function findDOMNode(component) {
 	);
 }
 
-/**
- * Deprecated way to control batched rendering inside the reconciler, but we
- * already schedule in batches inside our rendering code
- * @template Arg
- * @param {(arg: Arg) => void} callback function that triggers the updated
- * @param {Arg} [arg] Optional argument that can be passed to the callback
- */
-// eslint-disable-next-line camelcase
-const unstable_batchedUpdates = (callback, arg) => callback(arg);
-
 /**
  * In React, `flushSync` flushes the entire tree and forces a rerender. It's
  * implmented here as a no-op.
@@ -237,8 +227,6 @@ export {
 	memo,
 	forwardRef,
 	flushSync,
-	// eslint-disable-next-line camelcase
-	unstable_batchedUpdates,
 	StrictMode,
 	Suspense,
 	lazy,
@@ -285,7 +273,6 @@ export default {
 	memo,
 	forwardRef,
 	flushSync,
-	unstable_batchedUpdates,
 	StrictMode,
 	Suspense,
 	lazy,
diff --git a/compat/src/render.js b/compat/src/render.js
index f18cbd896b..0cdd6dad55 100644
--- a/compat/src/render.js
+++ b/compat/src/render.js
@@ -36,13 +36,7 @@ const CAMEL_REPLACE = /[A-Z0-9]/g;
 const IS_DOM = typeof document !== 'undefined';
 
 // Input types for which onchange should not be converted to oninput.
-// type="file|checkbox|radio", plus "range" in IE11.
-// (IE11 doesn't support Symbol, which we use here to turn `rad` into `ra` which matches "range")
-const onChangeInputType = type =>
-	(typeof Symbol != 'undefined' && typeof Symbol() == 'symbol'
-		? /fil|che|rad/
-		: /fil|che|ra/
-	).test(type);
+const onChangeInputType = type => /fil|che|rad/.test(type);
 
 // Some libraries like `react-virtualized` explicitly check for this.
 Component.prototype.isReactComponent = {};
diff --git a/compat/test/browser/exports.test.js b/compat/test/browser/exports.test.js
index cced23da45..d96e4bed4c 100644
--- a/compat/test/browser/exports.test.js
+++ b/compat/test/browser/exports.test.js
@@ -58,7 +58,6 @@ describe('compat exports', () => {
 		expect(Compat.Children.toArray).to.exist.and.be.a('function');
 		expect(Compat.Children.only).to.exist.and.be.a('function');
 		expect(Compat.unmountComponentAtNode).to.exist.and.be.a('function');
-		expect(Compat.unstable_batchedUpdates).to.exist.and.be.a('function');
 		expect(Compat.version).to.exist.and.be.a('string');
 		expect(Compat.startTransition).to.be.a('function');
 	});
@@ -99,7 +98,6 @@ describe('compat exports', () => {
 		expect(Named.Children.toArray).to.exist.and.be.a('function');
 		expect(Named.Children.only).to.exist.and.be.a('function');
 		expect(Named.unmountComponentAtNode).to.exist.and.be.a('function');
-		expect(Named.unstable_batchedUpdates).to.exist.and.be.a('function');
 		expect(Named.version).to.exist.and.be.a('string');
 	});
 });
diff --git a/compat/test/browser/unstable_batchedUpdates.test.js b/compat/test/browser/unstable_batchedUpdates.test.js
deleted file mode 100644
index bef738484b..0000000000
--- a/compat/test/browser/unstable_batchedUpdates.test.js
+++ /dev/null
@@ -1,33 +0,0 @@
-import { unstable_batchedUpdates, flushSync } from 'preact/compat';
-
-describe('unstable_batchedUpdates', () => {
-	it('should call the callback', () => {
-		const spy = sinon.spy();
-		unstable_batchedUpdates(spy);
-		expect(spy).to.be.calledOnce;
-	});
-
-	it('should call callback with only one arg', () => {
-		const spy = sinon.spy();
-		unstable_batchedUpdates(spy, 'foo', 'bar');
-		expect(spy).to.be.calledWithExactly('foo');
-	});
-});
-
-describe('flushSync', () => {
-	it('should invoke the given callback', () => {
-		const returnValue = {};
-		const spy = sinon.spy(() => returnValue);
-		const result = flushSync(spy);
-		expect(spy).to.have.been.calledOnce;
-		expect(result).to.equal(returnValue);
-	});
-
-	it('should invoke the given callback with the given argument', () => {
-		const returnValue = {};
-		const spy = sinon.spy(() => returnValue);
-		const result = flushSync(spy, 'foo');
-		expect(spy).to.be.calledWithExactly('foo');
-		expect(result).to.equal(returnValue);
-	});
-});