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

[Vajrasky Kok]

Vajrasky Kok added the comment:

I got another inspiration.

The third patch uses copy.copy to copy the Message before mutating it in string generator, then restore it after printing the mutated message.

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Added file: http://bugs.python.org/file32867/fix_serialization_message_object_mutation_v3.patch

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