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Sun Aug 27 12:00:51 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-August/148997.html

Does setting an ImplicitScopeVar to None set the value to None, or just
remove it?

If it removes it, does that effectively unmask a previously masked value?

If it really sets to None, then is there a way to explicitly unmask
previously masked values?

Perhaps the initial constructor should require an initial value
 (defaulting to None) and the docs should give examples both for using a
sensible default value and for using a special "unset" marker.

-jJ
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[Python-Dev] Pep 550 and None/masking