TypeScript return type inconsistency for IDL.encode

[bdemann]

Describe the bug
The return type of IDL.encode is specified to be an ArrayBuffer but at run time it is actually a Uint8Array.

• Version 2.1.3

import { IDL } from "@dfinity/candid";

const result = IDL.encode([IDL.Text], ["hello"]);

console.log(result instanceof Uint8Array); // true
console.log(result instanceof ArrayBuffer); // false
console.log(result); // shows a Uint8Array