Describe the feature you'd like to request

As a user, I want to know if my cache hit came from my local filesystem or from the remote cache.

Describe the solution you'd like

Right now our cache abstraction for fetch returns a boolean for hit/miss. We should change that to an object or enum which adds source information.

type FetchResult struct {
  // Fetch was successful
  Status: bool,
  // Source: local, remote
  Source: string,
}

Describe alternatives you've considered

Could alter the shape of the struct to simplify things.