From early July until the beginning of this week, the PostgreSQL project has been maintaining eight active branches: 7.4, 8.0, 8.1, 8.2, 8.3, 8.4, 9.0, and the master branch (9.1devel). As a result, a significant number of bug fixes and security updates had to be back-patched into all of those releases. At least for me, the recent switch to git has made back-patching, at least for simple cases
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