How are remote function queries cached?

[kwangure]

In the Remote Function docs, it says:

Queries are cached while they’re on the page, meaning getPosts() === getPosts(). This means you don’t need a reference like const posts = getPosts() in order to update the query.

WTF does "while they're on the page" mean? What does "cached" (an overloaded term) mean?

My working interpretation of what was meant is:
Queries run once per navigation. Re-running the same query returns the exact same data reference (so getPosts() === getPosts() is true). Because the query value is stable, you don’t need to store it in a local reference (for example const posts = getPosts()) in order to update the query.

Is my interpretation correct? If it's cached (in memory?), what busts the cache? Navigation? 5 second timer?

const foo = { id: 1 };
getPost(foo) === getPost(foo);  // should this be true? why?

getPost({ id: 2 }) === getPost({ id: 2 }) // should this be true? why?

[softlightwebinfo]

getPost(foo).refresh()