Hey everyone, in this example: https://nextjs.org/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#example, it says that we can use the route segment config to configure the caching behavior of the cache() function which originally only act as a memoization tool for deduping same requests per-call. The example shows that the configuration (export const revalidate = ...) is declared within the utils/get-item.ts function, which I assume it's a separate file dedicated for helper, not tied to a single route, and it can be imported from a different routes. Does that means the configuration only applied to get-item.ts or it'll affect the route that importing the function?

If it tied to the function, what's the difference between the unstable_cache?