Function selector

src/index.tsx:115–120

()

  //   s[hash] = state
  // })
  const selector = () => {
    Global.mutableState[storeId].count = 0
    Global.currentStoreId = storeId
    const res = u ? u() : n()
    return res
  }
  Global.mutableState[storeId].selector = selector
  return {
    // TODO: support selector