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fired in such rapid succession that we have not completed processing the first call before the next one comes in. We could do the cumbersome thing and keep track of an _isLoggingOff state but that is so inelegant that I can't bear to do it. I'd rather just cope in the Presents code and put the onus on the caller not to do wacky things like this. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5296 542714f4-19e9-0310-aa3c-eee0fc999fb1