Guido van Rossum <gu...@python.org> added the comment:

That's fair.  How do other builtins validate their pickling implementation?

Since the pickling goes through __reduce__/__reduce_ex__ we could instead test 
that those methods return the expected results, that pickling roundtrips, and 
that unpickling those exact byte strings produces the expected value?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40636>
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