[issue11763] assertEqual memory issues with large text inputs

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Rather than hardwiring `self.addCleanup(lambda: setattr(self, '_diffThreshold', 2**16))`, you should retrieve the previous value.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11763>
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