omit: use except from type-fest

which doesn't mess up tagged object unions

src/helpers/omit.ts

@@ -1,8 +1,10 @@
+import type { Except } from "type-fest"
+
 // eslint-disable-next-line import/no-unused-modules
 export function omit<Subject extends object, Key extends keyof Subject>(
   subject: Subject,
-  ...keys: Key[]
-): Omit<Subject, Key> {
+  keys: Key[],
+): Except<Subject, Key> {
   const result: any = {}
   for (const key in subject) {
     if (!keys.includes(key as unknown as Key)) {