[issue13566] Array objects pickled in 3.x with protocol <=2 are unpickled incorrectly in 2.x

[STINNER Victor]

STINNER Victor added the comment:

> If you pickle an array object on python 3 the typecode is encoded as a unicode string rather than as a byte string.  This makes python 2 reject the pickle.

Pickles files of Python 3 are supposed to be compatible with Python 2?

It looks very tricky to produce pickle files compatible with both versions.

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nosy: +haypo

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<http://bugs.python.org/issue13566>
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