Toggle does not work with statepathtree

[RikScheffer]

with this state setup

import { createReducer, createStatePaths } from 'redux-updaters';

export type AppState = {
	menuOpen: boolean;
};

const defaultState: AppState = {
	menuOpen: false,
};

export const app = createStatePaths(defaultState);

export const appReducer = createReducer<AppState>(defaultState, 'app');

I am able to use for example:

import { app } from '_redux/app';
...
dispatch(update(app.menuOpen, true));

however if I try this:

import { app } from '_redux/app';
...
dispatch(toggle(app.menuOpen));

I get the error Toggle: menuOpen is not a boolean
However, when I try

dispatch(toggle('app.menuOpen'));

it does work

so it seems the typecheck is unable to handle state trees