[issue19772] str serialization of Message object may mutate the payload and CTE.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 34fb36972f8d by R David Murray in branch '3.3':
#19772: Do not mutate message when downcoding to 7bit.
http://hg.python.org/cpython/rev/34fb36972f8d

New changeset 2e97d3500970 by R David Murray in branch 'default':
Merge #19772: Do not mutate message when downcoding to 7bit.
http://hg.python.org/cpython/rev/2e97d3500970

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nosy: +python-dev

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<http://bugs.python.org/issue19772>
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