DISPATCH-1660: Introduced a hash_handle on the item so we can set the item->hash_handle->item to zero when the item is freed. This ensures that the hash_handle will never be able to reach the freed item. This closes #1075.
DISPATCH-1660: Introduced a hash_handle on the item so we can set the item->hash_handle->item to zero when the item is freed. This ensures that the hash_handle will never be able to reach the freed item. This closes #1075.

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