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e2e60f5ff9
The previous version had a fatal flaw: it did ensureCapacity(1) on the freelist when allocating, but I neglected to consider that you could free() twice in a row. Silly! This strategy allocates an intrusive freelist node with every allocation, big or small. It also does not have the problems with resize because in this case we can push the upper areas of freed stuff into the corresponding freelist.