add comment explaining IDL.encode type/value mismatch

src/lib/stable/execute_with_candid_serde.ts

@@ -66,6 +66,10 @@ export function idlEncode(
     args: any[]
 ): Uint8Array {
     try {
+        // TODO IDL.encode has ArrayBuffer as the return type, but it actually returns a Uint8Array
+        // TODO we may need to remove the new Uint8Array in the future if they address the situation
+        // TODO we are not sure if they will make the final type and return value an ArrayBuffer
+        // TODO or a Uint8Array: https://github.com/demergent-labs/azle/issues/2061
         return new Uint8Array(IDL.encode(argTypes, args));
     } catch (error) {
         throw new Error(`Failed to encode Candid arguments: ${error}`);