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    For example, the parameter 'raise_on_defect' controls whether or not an RFC
    violation results in an error being raised or not, while 'max_line_length'
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    but a new Policy object can be created with only certain values changed by
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    raise_on_defect     -- If true, then defects should be raised as errors.
                           Default: False.

    linesep             -- string containing the value to use as separation
                           between output lines.  Default '\n'.

    cte_type            -- Type of allowed content transfer encodings

                           7bit  -- ASCII only
                           8bit  -- Content-Transfer-Encoding: 8bit is allowed

                           Default: 8bit.  Also controls the disposition of
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