[Unintuitive behavior] Store.get returns can return stale cached data after sourceOfTruth update

Maybe more of a question than a bug. This is related to #78, I believe. When calling Store.get() with no active streams, it will return the memory cached value instead of the sourceOfTruth value. This was initially quite confusing to me, though seems obvious now that I understand it. Is this the intended behavior?

To Reproduce
Here is a test case to reproduce the behavior:

    @Test
    fun `get returns source of truth`() {
        runBlocking {
            val ch = ConflatedBroadcastChannel<Int?>(null)
            val store = StoreBuilder.from<Unit, Int, Int>(
                fetcher = nonFlowValueFetcher { 0 },
                sourceOfTruth = SourceOfTruth.from(
                    reader = { ch.asFlow() },
                    writer = { _, value -> ch.offer(value) }
                )
            ).build()
            assert(store.get(Unit) == 0) // prime the memory cache
            ch.send(1)
            delay(500) // wait for flow to update
            assert(store.get(Unit) == 1)
        }
    }

Expected behavior
It would be nice if Store could track if there were active streams and default to fetching from the sourceOfTruth if non were active. As it stands, perhaps just updating the documentation to make clear what will happen in this scenario would work.