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New threads should inherit the contextvars.Context of their creator #128555

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@nascheme

Feature or enhancement

Proposal:

It would be convenient and likely less surprising if threads inherited the context of their creator, rather than starting with an empty context. This would match what asynio.Task does. This has been requested before, as gh-86981.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

https://discuss.python.org/t/thread-safe-warning-filters/

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    extension-modulesC modules in the Modules dirinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-featureA feature request or enhancement

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