createSelectors should be part of the library

[spro]

I think it's odd to have a chunk of code like this ...

import { StoreApi, UseBoundStore } from 'zustand'

type WithSelectors<S> = S extends { getState: () => infer T }
  ? S & { use: { [K in keyof T]: () => T[K] } }
  : never

const createSelectors = <S extends UseBoundStore<StoreApi<object>>>(
  _store: S,
) => {
  let store = _store as WithSelectors<typeof _store>
  store.use = {}
  for (let k of Object.keys(store.getState())) {
    ;(store.use as any)[k] = () => store((s) => s[k as keyof typeof s])
  }

  return store
}

... available in the docs but unavailable in the main library, I for one won't use it because it looks like a hack when copy and pasted

[dai-shi]

It's for third-party libraries.
I wouldn't use it either as it's kind of a hack.
Do you think we should discourage more in the docs?