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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