[issue38876] pickle is raising KeyError insteat of pickle.UnpicklingError under certain conditions

[PCManticore]

PCManticore <pcmanticore at gmail.com> added the comment:

It seems there are a couple of places in `_pickle.c` where we favour a `KeyError` instead of `UnpicklingError` such as https://github.com/python/cpython/blob/master/Modules/_pickle.c#L6178. From a quick debugging it seems it originates in `load_long_binget`. 

Ideally those places should return `UnpicklingError` instead, not sure why a `KeyError` was preferred. Happy to submit a patch if that's a change that makes sense.

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nosy: +Claudiu.Popa

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