isLoading = false with rapid requests

[braco]

If rapid requests are issued, like in an autocomplete scenario, isLoading will be false even when hanging requests are still open.

In other words:

1. Setup a series of fetches quickly as the user is typing
2. When a new fetch is issued, cancel the previous fetches
3. isLoading will === false even though current fetch is still open
4. results will still correctly return