diff --git a/examples/doublejump.js b/examples/doublejump.js
index 9536d5436..b773143da 100644
--- a/examples/doublejump.js
+++ b/examples/doublejump.js
@@ -49,8 +49,7 @@ scene("game", () => {
 		anchor("center"),
 		pos(0, 0),
 		body({ jumpForce: JUMP_FORCE }),
-		// allow 3 jumps
-		doubleJump(3),
+		doubleJump(),
 		rotate(0),
 		spin(),
 	])
diff --git a/src/kaboom.ts b/src/kaboom.ts
index eab6ef464..6eaf27834 100644
--- a/src/kaboom.ts
+++ b/src/kaboom.ts
@@ -66,6 +66,7 @@ import {
 	getExt,
 	dataURLToArrayBuffer,
 	EventController,
+	getErrorMessage,
 	// eslint-disable-next-line
 	warn,
 	// eslint-disable-next-line
@@ -1373,8 +1374,8 @@ export default (gopt: KaboomOpt = {}): KaboomCtx => {
 			return new Shader(ggl, vcode, fcode, VERTEX_FORMAT.map((vert) => vert.name))
 		} catch (e) {
 			const lineOffset = 14
-			const fmtRegex = /(?<type>^\w+) SHADER ERROR: 0:(?<line>\d+): (?<msg>.+)/
-			const match = (e as Error).message.match(fmtRegex)
+			const fmt = /(?<type>^\w+) SHADER ERROR: 0:(?<line>\d+): (?<msg>.+)/
+			const match = getErrorMessage(e).match(fmt)
 			const line = Number(match.groups.line) - lineOffset
 			const msg = match.groups.msg.trim()
 			const ty = match.groups.type.toLowerCase()
diff --git a/src/utils.ts b/src/utils.ts
index 99dae005f..9fff0973d 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -111,12 +111,18 @@ export class EventHandler<EventMap extends Record<string, any[]>> {
 }
 
 export function deepEq(o1: any, o2: any): boolean {
+	if (o1 === o2) {
+		return true
+	}
 	const t1 = typeof o1
 	const t2 = typeof o2
 	if (t1 !== t2) {
 		return false
 	}
 	if (t1 === "object" && t2 === "object" && o1 !== null && o2 !== null) {
+		if (Array.isArray(o1) !== Array.isArray(o2)) {
+			return false
+		}
 		const k1 = Object.keys(o1)
 		const k2 = Object.keys(o2)
 		if (k1.length !== k2.length) {
@@ -125,15 +131,13 @@ export function deepEq(o1: any, o2: any): boolean {
 		for (const k of k1) {
 			const v1 = o1[k]
 			const v2 = o2[k]
-			if (!(typeof v1 === "function" && typeof v2 === "function")) {
-				if (!deepEq(v1, v2)) {
-					return false
-				}
+			if (!deepEq(v1, v2)) {
+				return false
 			}
 		}
 		return true
 	}
-	return o1 === o2
+	return false
 }
 
 export function base64ToArrayBuffer(base64: string): ArrayBuffer {
@@ -179,6 +183,9 @@ export const uid = (() => {
 	return () => id++
 })()
 
+export const getErrorMessage = (error: unknown) =>
+	(error instanceof Error) ? error.message : String(error)
+
 const warned = new Set()
 
 export function warn(msg: string) {