[issue40636] Provide a strict form of zip (PEP-618) requiring same length inputs

[Guido van Rossum]

Guido van Rossum <guido at 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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