Maybe I'm being brain-dead here (wouldn't be the first time), but you
start off with a hash of a million integer keys, but you end up with
something much less useful than a hash. No associated values, and no
guarantee of a million unique "keys" unless you use the two-pronged test
during insertion. It may or may not function as a memory efficient "set",
but it isn't a hash (not even a poor man's hash).
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