BUG: Pickle NA objects
According to
https://docs.python.org/3/library/pickle.html#object.__reduce__,

> If a string is returned, the string should be interpreted as the name
> of a global variable. It should be the object’s local name relative to
> its module; the pickle module searches the module namespace to determine
> the object’s module. This behaviour is typically useful for singletons.

Closes https://github.com/pandas-dev/pandas/issues/31847
@TomAugspurger can you re-push?  looks like azure has stalled It'll be a week or so before I can look at this again.


On Fri, Feb 21, 2020 at 10:34 AM jbrockmendel <notifications@github.com>
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> @TomAugspurger <https://github.com/TomAugspurger> can you re-push? looks
> like azure has stalled
>
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 @TomAugspurger can you rebase and update (small requests) I think everything has been addressed. Thanks @TomAugspurger ! @MeeseeksDev backport to 1.0.x