Currently we pack as tightly as possible, which is a historical consequence of the economics of how our SaaS worked. We actually have the ability to select different bin packing policies in our master branch, so that should be out in 2.2
We don't have hard and fast release dates, to avoid "crunches", so I can't give a very useful answer on this. But we are a few weeks away from the planned code freeze, so it will likely be >1 month away.
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