Additional information for FsEvent objects with the "other" kind.

• "rescan": rescan notices indicate either a lapse in the events or a change in the filesystem such that events received so far can no longer be relied on to represent the state of the filesystem now. An application that simply reacts to file changes may not care about this. An application that keeps an in-memory representation of the filesystem will need to care, and will need to refresh that representation directly from the filesystem.