remove duplicate check
remove duplicate check

Summary:
As promised in an earlier diff, duplicate checks along the Obj1 ~> Exact(Obj2) path and the Obj1 ~>
Obj2[exact=true] path are now reduced to just the checks along the latter.

Reviewed By: samwgoldman

Differential Revision: D8040525

fbshipit-source-id: a697bb81b8364b39fc3fc69748a95c9f34d649d1

mroch/flow,AgentME/flow,mroch/flow,popham/flow,facebook/flow,gabelevi/flow,nmote/flow,JonathanUsername/flow,jamesgpearce/flow,nmote/flow,JonathanUsername/flow,AgentME/flow,samwgoldman/flow,claudiopro/flow,mroch/flow,gabelevi/flow,nmote/flow,gabelevi/flow,jamesgpearce/flow,jamesgpearce/flow,AgentME/flow,mroch/flow,gabelevi/flow,facebook/flow,jamesgpearce/flow,nmote/flow,AgentME/flow,facebook/flow,gabelevi/flow,AgentME/flow,JonathanUsername/flow,jamesgpearce/flow,gabelevi/flow,samwgoldman/flow,samwgoldman/flow,JonathanUsername/flow,gabelevi/flow,samwgoldman/flow,claudiopro/flow,nmote/flow,mroch/flow,JonathanUsername/flow,claudiopro/flow,facebook/flow,samwgoldman/flow,facebook/flow,jamesgpearce/flow,samwgoldman/flow,claudiopro/flow,nmote/flow,mroch/flow,popham/flow,JonathanUsername/flow,popham/flow,jamesgpearce/flow,popham/flow,samwgoldman/flow,nmote/flow,claudiopro/flow,popham/flow,facebook/flow,mroch/flow,JonathanUsername/flow,popham/flow,popham/flow,facebook/flow