From 0677d631c14609a09cb221ecffa0b4a7599d5674 Mon Sep 17 00:00:00 2001
From: Jovi De Croock <decroockjovi@gmail.com>
Date: Wed, 2 Oct 2024 20:44:46 +0200
Subject: [PATCH 1/2] Test some performance stuff

---
 src/diff/index.js | 3 ++-
 src/diff/props.js | 5 ++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/diff/index.js b/src/diff/index.js
index 287f94344d..e08afe4ad3 100644
--- a/src/diff/index.js
+++ b/src/diff/index.js
@@ -1,4 +1,5 @@
 import {
+	EMPTY_ARR,
 	EMPTY_OBJ,
 	MODE_HYDRATE,
 	MODE_SUSPENDED,
@@ -498,7 +499,7 @@ function diffElementNodes(
 				dom.innerHTML = newHtml.__html;
 			}
 
-			newVNode._children = [];
+			newVNode._children = EMPTY_ARR;
 		} else {
 			if (oldHtml) dom.innerHTML = '';
 
diff --git a/src/diff/props.js b/src/diff/props.js
index 316146f0fd..7d0960765a 100644
--- a/src/diff/props.js
+++ b/src/diff/props.js
@@ -135,7 +135,10 @@ export function setProperty(dom, name, value, oldValue, namespace) {
 
 		if (typeof value == 'function') {
 			// never serialize functions as attribute values
-		} else if (value != null && (value !== false || name[4] === '-')) {
+		} else if (
+			value != null &&
+			(value !== false || (name.length > 4 && name[4] === '-'))
+		) {
 			dom.setAttribute(name, name == 'popover' && value == true ? '' : value);
 		} else {
 			dom.removeAttribute(name);

From 41eee180d8d74e589f7ca6a8c596934f3c2ae8b2 Mon Sep 17 00:00:00 2001
From: jdecroock <decroockjovi@gmail.com>
Date: Thu, 3 Oct 2024 17:03:11 +0200
Subject: [PATCH 2/2] Make oldVNode monomorphic

---
 src/create-element.js | 4 ++++
 src/diff/children.js  | 8 ++++----
 src/render.js         | 4 ++--
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/create-element.js b/src/create-element.js
index 66898b2224..67d5c910be 100644
--- a/src/create-element.js
+++ b/src/create-element.js
@@ -84,6 +84,10 @@ export function createVNode(type, props, key, ref, original) {
 	return vnode;
 }
 
+// @ts-ignore
+export const EMPTY_VNODE = createVNode(null, {});
+EMPTY_VNODE._children = [];
+
 export function createRef() {
 	return { current: null };
 }
diff --git a/src/diff/children.js b/src/diff/children.js
index ba2730478c..59b668b309 100644
--- a/src/diff/children.js
+++ b/src/diff/children.js
@@ -1,6 +1,6 @@
 import { diff, unmount, applyRef } from './index';
-import { createVNode, Fragment } from '../create-element';
-import { EMPTY_OBJ, EMPTY_ARR, INSERT_VNODE, MATCHED } from '../constants';
+import { createVNode, Fragment, EMPTY_VNODE } from '../create-element';
+import { EMPTY_ARR, INSERT_VNODE, MATCHED } from '../constants';
 import { isArray } from '../util';
 import { getDomSibling } from '../component';
 
@@ -67,9 +67,9 @@ export function diffChildren(
 		// At this point, constructNewChildrenArray has assigned _index to be the
 		// matchingIndex for this VNode's oldVNode (or -1 if there is no oldVNode).
 		if (childVNode._index === -1) {
-			oldVNode = EMPTY_OBJ;
+			oldVNode = EMPTY_VNODE;
 		} else {
-			oldVNode = oldChildren[childVNode._index] || EMPTY_OBJ;
+			oldVNode = oldChildren[childVNode._index] || EMPTY_VNODE;
 		}
 
 		// Update childVNode._index to its final index
diff --git a/src/render.js b/src/render.js
index e0fec45424..dac3036dc2 100644
--- a/src/render.js
+++ b/src/render.js
@@ -1,6 +1,6 @@
 import { EMPTY_OBJ } from './constants';
 import { commitRoot, diff } from './diff/index';
-import { createElement, Fragment } from './create-element';
+import { createElement, Fragment, EMPTY_VNODE } from './create-element';
 import options from './options';
 import { slice } from './util';
 
@@ -39,7 +39,7 @@ export function render(vnode, parentDom, replaceNode) {
 		// Determine the new vnode tree and store it on the DOM element on
 		// our custom `_children` property.
 		vnode,
-		oldVNode || EMPTY_OBJ,
+		oldVNode || EMPTY_VNODE,
 		EMPTY_OBJ,
 		parentDom.namespaceURI,
 		!isHydrating && replaceNode