diff --git a/src/util/util/extensions/Array.test.ts b/src/util/util/extensions/Array.test.ts
index 454197c1f..faabfdeab 100644
--- a/src/util/util/extensions/Array.test.ts
+++ b/src/util/util/extensions/Array.test.ts
@@ -74,14 +74,4 @@ describe("Array extensions", () => {
 		// @ts-expect-error
 		assert.deepEqual([].intersect(arr2), []);
 	});
-
-	it("except", () => {
-		const arr1 = [1, 2, 3, 4];
-		const arr2 = [3, 4, 5, 6];
-		assert.deepEqual(arr1.except(arr2), [1, 2]);
-		assert.deepEqual(arr1.except([]), [1, 2, 3, 4]);
-		// eslint-disable-next-line @typescript-eslint/ban-ts-comment
-		// @ts-expect-error
-		assert.deepEqual([].except(arr2), []);
-	});
 });
diff --git a/src/util/util/extensions/Array.ts b/src/util/util/extensions/Array.ts
index d061edf96..11d939207 100644
--- a/src/util/util/extensions/Array.ts
+++ b/src/util/util/extensions/Array.ts
@@ -26,7 +26,6 @@ declare global {
 		distinct(): T[];
 		distinctBy<K>(key: (elem: T) => K): T[];
 		intersect(other: T[]): T[];
-		except(other: T[]): T[];
 	}
 }
 
@@ -87,10 +86,6 @@ export function arrayIntersect<T>(this: T[], other: T[]): T[] {
 	return this.filter((value) => other.includes(value));
 }
 
-export function arrayExcept<T>(this: T[], other: T[]): T[] {
-	return this.filter((value) => !other.includes(value));
-}
-
 // register extensions
 if (!Array.prototype.containsAll)
 	Array.prototype.containsAll = function <T>(this: T[], target: T[]) {
@@ -126,7 +121,3 @@ if (!Array.prototype.intersect)
 	Array.prototype.intersect = function <T>(this: T[], other: T[]) {
 		return arrayIntersect.call(this, other);
 	};
-if (!Array.prototype.except)
-	Array.prototype.except = function <T>(this: T[], other: T[]) {
-		return arrayExcept.call(this, other);
-	};
diff --git a/src/util/util/lambert-server/check.ts b/src/util/util/lambert-server/check.ts
index 4dabc5cea..c60a70f7c 100644
--- a/src/util/util/lambert-server/check.ts
+++ b/src/util/util/lambert-server/check.ts
@@ -2,8 +2,7 @@ import { NextFunction, Request, Response } from "express";
 import { HTTPError } from ".";
 
 const OPTIONAL_PREFIX = "$";
-const EMAIL_REGEX =
-	/^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
+const EMAIL_REGEX = /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
 
 export function check(schema: any) {
 	return (req: Request, res: Response, next: NextFunction) => {
@@ -31,11 +30,7 @@ export class Email {
 	}
 }
 
-export function instanceOf(
-	type: any,
-	value: any,
-	{ path = "", optional = false }: { path?: string; optional?: boolean } = {}
-): Boolean {
+export function instanceOf(type: any, value: any, { path = "", optional = false }: { path?: string; optional?: boolean } = {}): boolean {
 	if (!type) return true; // no type was specified
 
 	if (value == null) {
@@ -55,7 +50,9 @@ export function instanceOf(
 			try {
 				value = BigInt(value);
 				if (typeof value === "bigint") return true;
-			} catch (error) {}
+			} catch (error) {
+				//Ignore BigInt error
+			}
 			throw `${path} must be a bigint`;
 		case Boolean:
 			if (value == "true") value = true;
@@ -98,9 +95,8 @@ export function instanceOf(
 		}
 		if (typeof value !== "object") throw `${path} must be a object`;
 
-		const diff = Object.keys(value).except(
-			Object.keys(type).map((x) => (x.startsWith(OPTIONAL_PREFIX) ? x.slice(OPTIONAL_PREFIX.length) : x))
-		);
+		const filterset = new Set(Object.keys(type).map((x) => (x.startsWith(OPTIONAL_PREFIX) ? x.slice(OPTIONAL_PREFIX.length) : x)));
+		const diff = Object.keys(value).filter((_) => filterset.has(_));
 
 		if (diff.length) throw `Unknown key ${diff}`;