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curr_items tracks how many items are linked in the hash table. internally to
the hash table, hash_items tracked how many items were in the hash table.
on every insert/delete, hash_items had to be locked and checked to see if th
table should be expanded. rip that all out, and call a check with the
once-per-second clock event to check for hash table expansion.
this actually ends up fixing an obscure bug: if you burst a bunch of sets
then stop, the hash table won't attempt to expand a second time until the
next insert. with this change, every second the hash table has a chance of
expanding again.
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