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Distributed under the MIT License.
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    >>> s
    'ab\ncd\\\\n\x00ab\rcd\\\n'
    >>> res = _string_escape(s)
    >>> s == res.decode('string_escape')
    True
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    >>> sorted(decodeextra(encodeextra({'foo': 'bar',
    ...                                 'baz': chr(92) + chr(0) + '2'})
    ...                    ).iteritems())
    [('baz', '\\\x002'), ('branch', 'default'), ('foo', 'bar')]
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cCs�|jr|j|j�}|j|jdd�}|j|j��|jdj|j��|j�g|_t|_n|jr�tSt	S(sDcreate a file containing the unfinalized state for pretxnchangegroups.aR@R
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        nodeid
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        user
          : user, no 
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        time tz extra
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                        : extra is metadata, encoded and separated by ''
                        : older versions ignore it
        files

       : files modified by the cset, no 
 or 
 allowed
        (.*)            : comment (free text, ideally utf-8)

        changelog v0 doesn't use extra
        R
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