Fix to use more accurate types with custom isArray() and add lint (#5261)

* Fix to use more accurate types with custom isArray()

* Add lint against Array.isArray()

src/lib/utils.ts

@@ -11,6 +11,7 @@ export const uuidv4 = v4
  * A safer type guard for arrays since the built-in Array.isArray() asserts `any[]`.
  */
 export function isArray(val: any): val is unknown[] {
+  // eslint-disable-next-line no-restricted-syntax
   return Array.isArray(val)
 }