Prefetch timeout

Describe the problem

SvelteKit include the ability to prefetch pages while the user is hovering over a link.
However, a the prefetched data might not be relevant after a period of time, so when the user will click on the link, say after a minute, she will get old data.

Describe the proposed solution

I think the simple solution is to allow to specify timeout.
Either allow to specify timeout in a syntax similar to <a sveltekit:prefetch={timeout: (time in seconds)} ...>, or get the timeout from an optional "timeout" property in the return value of load() function, or even support both solutions.

A better/additional aprouch to the simple "timeout" property in my opinion, is to allow the developer to give a predicate:
function dataValidity(lastPrefetchedTime): boolean

Alternatives considered

The manual alternative would be to use some custom svelte action in the <a> tag which calls prefetch() manually and call it again if the user hover/click on the link after a certain amount of time.

Sadly, as far as I know, there is not even a way to invalidate the prefetched data manually. (the invalidate() works only for the currently active page acoording to the docs)

Importance

would make my life easier

Additional Information

No response

Start by reading the prefetch() and invalidate() entry points and how load() data is handled. Compare the proposed timeout, load() return property, and predicate approaches before choosing a supported behavior. Done means prefetched data can be invalidated or refreshed according to a documented, tested API.