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the spiritual successor of #172 (a much simpler implementation)
The problem with using the
Slab
capacity as the group capacity is that the slab has its own growth rate, which differs from the other internal structures. It was possible that the slab had the capacity for more items, but the rest of the structures didn't (I think this was the problem in #168).The solution for this is explicitly tracking the capacity inside the group.
This also provides a new
reserve
method onFuturesGroup
andStreamGroup
, so the user can prepare the group beforehand to receive more items.Closes #169