Feature Request: Define custom actions when cache become invalidated

Is it possible to execute some custom actions when memory cache become invalidated?

I am trying to integrate Jetpack Paging with Store.
The DataSource required us to call invalidate when we want to stop paging.

Currently, I am using a map to cache the latest result and invalidate old one from the fetcher:

val dataSourceMap = mutableMap<Key, WeakReference<PagedList>>()
val store = StoreBuilder.fromNonFlow { key: Key ->
  val pagedList = createPagedList(key)
  dataSourceMap[key]?.get()?.dataSource?.invalidate()
  dataSourceMap[key] = WeakReferene(pagedList)
  pagedList
}.build()

Maybe it will be convenient if StoreBuilder can provide a onCacheInvalidated method:

val store = StoreBuilder.fromNonFlow { key: Key ->
  createPagedList(key)
}.onCacheInvalidate { pagedList -> 
  pagedList.dataSource.invalidate() 
}.build()

Edit: Use WeakReference

Start by tracing StoreBuilder and the cache invalidation path to understand when cached values are discarded. Define the callback's timing and value semantics, then add the requested invalidation behavior and coverage in the existing cache tests; done means callers can trigger the Jetpack Paging DataSource invalidation when its cached value is replaced.