Revert change from 2013-05-06 (SHA-1: 10c54a7eca144a094d6607d5572d8d8a4e506b28) now that single-lock promotion is handled properly.
Minor code simplification.
Merge remote-tracking branch 'remotes/origin/master' into compress
Minor code simplification.
Merge branch 'master' of github.com:cojen/Tupl
Merge remote-tracking branch 'remotes/origin/master' into compress