Why does cloning from VSTS return old unreferenced objects?

UPDATE (2017-08-09): We rolled out commit reachability bitmap indexes to VSTS and removed the clone cheat mentioned below. Cloning will no longer download unreachable objects!. We still don’t have true object-level git gc on the server yet, but clone sizes will be smaller now. TFS on-prem will get these changes in v.Next (not in any…

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