[Python-Dev] PEP 567 v2

[Victor Stinner]

Why ContextVar.reset(token) does nothing at the second call with the same
token? What is the purpose of Token._used? I guess that there is an use
case to justify this behaviour.

reset() should have a result: true if the variable was restored to its
previous state, false if reset() did nothing because the token was already
used. And/Or Token should have a read-only "used" property.

Victor
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