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multislab: O(1) deallocation through an iterator - #10
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pool::erase held the node in its iterator but freed by pointer, paying
find_owner's scan over every slab. multislab::deallocate(iterator) frees
by node and bit index; pool::erase and the emplace rollback use it.
slab gains deallocate_at(index), index_of(ptr) and iterator::index().
Erase at 10k slabs: 8.8 us -> 20 ns.
Closes #5