Document expected behaviour instead of leaving XXX comment
Document expected behaviour instead of leaving XXX comment

wakermahmud/sync-engine,nylas/sync-engine,ErinCall/sync-engine,rmasters/inbox,PriviPK/privipk-sync-engine,PriviPK/privipk-sync-engine,wakermahmud/sync-engine,ErinCall/sync-engine,PriviPK/privipk-sync-engine,EthanBlackburn/sync-engine,rmasters/inbox,Eagles2F/sync-engine,ErinCall/sync-engine,ErinCall/sync-engine,closeio/nylas,closeio/nylas,PriviPK/privipk-sync-engine,gale320/sync-engine,wakermahmud/sync-engine,Eagles2F/sync-engine,rmasters/inbox,EthanBlackburn/sync-engine,jobscore/sync-engine,nylas/sync-engine,jobscore/sync-engine,gale320/sync-engine,ErinCall/sync-engine,wakermahmud/sync-engine,gale320/sync-engine,closeio/nylas,Eagles2F/sync-engine,closeio/nylas,jobscore/sync-engine,nylas/sync-engine,nylas/sync-engine,gale320/sync-engine,gale320/sync-engine,Eagles2F/sync-engine,EthanBlackburn/sync-engine,wakermahmud/sync-engine,jobscore/sync-engine,rmasters/inbox,EthanBlackburn/sync-engine,PriviPK/privipk-sync-engine,EthanBlackburn/sync-engine,Eagles2F/sync-engine