understanding store setter updates

import { produce } from "solid-js/store"

// without produce
setStore("users", 0, "username", "newUsername")
setStore("users", 0, "location", "newLocation")

// with produce
setStore(
  "users",
  0,
  produce((user) => {
    user.username = "newUsername"
    user.location = "newLocation"
  })
)