
Some secondary index implementations store changes in nonoverlapping subindexes. Due to the non-atomic nature of these subindexes, we might fleetingly observe a change as present twice. This is not an error that the user can do anything about, so relax ChangeFinder a bit in this specific case. Change-Id: Ie434937ad6e05c063bae04fc0affe3eaef6a51e0