A tick that follows one of the watch's asks would only fetch the same data again. The tick
fetches when nothing asked since the last one, such as a watch out of range. A save's refetch
that is still waiting to run owns the next fetch, so a tick that lands in that moment waits.
Decides whether a slow tick should start a fetch.
A tick that follows one of the watch's asks would only fetch the same data again. The tick fetches when nothing asked since the last one, such as a watch out of range. A save's refetch that is still waiting to run owns the next fetch, so a tick that lands in that moment waits.