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Some versions of the Bundler 1.1 RC series introduced corrupted
lockfiles. There were two major problems:

* multiple copies of the same GIT section appeared in the lockfile
* when this happened, those sections got multiple copies of gems
  in those sections.

As a result, Bundler 1.1 contains code that fixes the earlier
corruption. We will remove this fix-up code in Bundler 1.2.
Please help! Open an issue on GitHub if this assessment is incorrect.