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* When building new working trees, default to reading from the repository
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rather than the source tree unless explicitly requested. (via
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``--files-from`` and ``--hardlink`` for ``bzr branch`` and
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``bzr checkout``. Generally, 2a format repositories extract
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content faster than seeking and reading content from another tree,
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especially in cold-cache situations. (John Arbash Meinel, #607298)