[issue3675] Python 2.6 can't read sets pickled with Python 3.0

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Was it really intended that 3.0 pickles unpickle on 2.6?
What about other changes like moving something from one module to
another (reduce from built-in to functools), changing all classes to new
style (several examples), or adding methods to a built-in class (floats)?

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nosy: +tjreedy

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<http://bugs.python.org/issue3675>
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