How to cut extra liftime of expired loose objects

I think there is logic somewhere in git gc or its minions that gives expired objects that have been packed a two weeks extra life time as loose objects.

That is, reachable loose objects are moved to a pack, but those objects that were packed, but become unreachable due to expired reflogs, are evicted from the pack and live for another two weeks or so as loose objects.

As a consequence of this, I always have a few thousand loose objects in my busy repositories, no matter how often I collect garbage. Is there a knob that removes the extra lease of life of objects without reducing the usual expiration times of reflogs etc?

-- Hannes