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revision_id: if not None, the revision history in the new branch will
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be truncated to end with revision_id.
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# def clone(self, to_location, revision=None, basis_branch=None, to_branch_format=None):
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# after 0.8 releases, the *args and **kwargs should be changed:
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# def clone(self, to_bzrdir, revision_id=None):