"In a perfect world, we would always work on the trunk.
This would limit the complexity of merging changes between two or
more codelines. However, in the real world of software development,
you might be developing for a future release and at some point need
to make an emergency patch to a version that's already in use. You
need access to a copy of the source code for that released version
— without disrupting the new code that's under
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