[issue31742] Default to emitting FutureWarning for provisional APIs

[Amber Brown]

Amber Brown <hawkowl at atleastfornow.net> added the comment:

So you're proposing a coordinated effort across the half dozen, possibly more, test runners to enable some flags, so CPython doesn't log a single message, possibly two, that you're using unsupported experimental software with no backwards compatibility guarantee?

I think the warnings control setting there could be a good solution for your "I don't care, don't show the warning" use case, but I also think explicit disabling per module is a better solution to recommend to users (since we might know that we're using typing, and we say "we are okay with using typing", but might not realise that we're silencing a new provisional module used by an updated library sometime in the future).

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<https://bugs.python.org/issue31742>
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