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3 slab iterator caches the bitmap word - #8
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The iterator copied the current bitmap word, so a block freed after the
iterator was built was still visited, and one allocated ahead of it was
skipped. pool::erase could then return end() with live elements left.
The iterator now holds a bit index and re-reads the bitmap on each
increment. begin(), operator++ and make_iterator share next_allocated().
Closes #3