diff --git a/src/util/entities/Channel.ts b/src/util/entities/Channel.ts
index 252fb8f9e..39ab04e4b 100644
--- a/src/util/entities/Channel.ts
+++ b/src/util/entities/Channel.ts
@@ -280,7 +280,7 @@ export class Channel extends BaseClass {
 			if (!ur.channel.recipients) continue;
 			const re = ur.channel.recipients.map((r) => r.user_id);
 			if (re.length === channelRecipients.length) {
-				if (re.containsAll(channelRecipients)) {
+				if (channelRecipients.every((_) => re.includes(_))) {
 					if (channel == null) {
 						channel = ur.channel;
 						await ur.assign({ closed: false }).save();
@@ -429,7 +429,7 @@ export class Channel extends BaseClass {
 	}
 
 	async getUserPermissions(opts: { user_id?: string; user?: User; member?: Member; guild?: Guild }): Promise<Permissions> {
-		if(this.isDm()) this.owner_id == (opts.user_id ?? opts.user?.id) ? Permissions.ALL : Permissions.DEFAULT_DM_PERMISSIONS;
+		if (this.isDm()) return this.owner_id == (opts.user_id ?? opts.user?.id) ? Permissions.ALL : Permissions.DEFAULT_DM_PERMISSIONS;
 		let guild = opts.guild;
 		if (!guild) {
 			if (this.guild) guild = this.guild;
@@ -470,7 +470,7 @@ export class Channel extends BaseClass {
 							position: true,
 						},
 					},
-					loadEagerRelations: false
+					loadEagerRelations: false,
 				})
 			).roles
 		).sort((a, b) => a.position - b.position); // ascending by position
diff --git a/src/util/util/extensions/Array.test.ts b/src/util/util/extensions/Array.test.ts
index 432e9a590..1dea2cf43 100644
--- a/src/util/util/extensions/Array.test.ts
+++ b/src/util/util/extensions/Array.test.ts
@@ -5,18 +5,6 @@ import { describe, it } from "node:test";
 import assert from "node:assert/strict";
 
 describe("Array extensions", () => {
-	it("containsAll", () => {
-		const arr = [1, 2, 3, 4, 5];
-		assert(arr.containsAll([1, 2]));
-		assert(!arr.containsAll([1, 6]));
-		assert(arr.containsAll([]));
-		assert([].containsAll([]));
-
-		// eslint-disable-next-line @typescript-eslint/ban-ts-comment
-		// @ts-expect-error
-		assert(![].containsAll([1]));
-	});
-
 	it("partition", () => {
 		const arr = [1, 2, 3, 4, 5];
 		const [even, odd] = arr.partition((n) => n % 2 === 0);
diff --git a/src/util/util/extensions/Array.ts b/src/util/util/extensions/Array.ts
index eec76a0fb..f8ca31894 100644
--- a/src/util/util/extensions/Array.ts
+++ b/src/util/util/extensions/Array.ts
@@ -18,7 +18,6 @@
 
 declare global {
 	interface Array<T> {
-		containsAll(target: T[]): boolean;
 		partition(filter: (elem: T) => boolean): [T[], T[]];
 		forEachAsync(callback: (elem: T, index: number, array: T[]) => Promise<void>): Promise<void>;
 		filterAsync(callback: (elem: T, index: number, array: T[]) => Promise<boolean>): Promise<T[]>;
@@ -28,10 +27,6 @@ declare global {
 	}
 }
 
-export function arrayContainsAll<T>(arr: T[], target: T[]) {
-	return target.every((v) => arr.includes(v));
-}
-
 /* https://stackoverflow.com/a/50636286 */
 export function arrayPartition<T>(array: T[], filter: (elem: T) => boolean): [T[], T[]] {
 	const pass: T[] = [],
@@ -86,10 +81,6 @@ export function arrayIntersect<T>(this: T[], other: T[]): T[] {
 }
 
 // register extensions
-if (!Array.prototype.containsAll)
-	Array.prototype.containsAll = function <T>(this: T[], target: T[]) {
-		return arrayContainsAll(this, target);
-	};
 if (!Array.prototype.partition)
 	Array.prototype.partition = function <T>(this: T[], filter: (elem: T) => boolean) {
 		return arrayPartition(this, filter);