Miro Hrončok <m...@hroncok.cz> added the comment:

"Wait for the warning to appear in at least two major Python versions. It's 
fine to wait more than two releases."

https://www.python.org/dev/peps/pep-0387/#basic-policy-for-backwards-compatibility

So indeed, if you add the warning in 3.10, the behavior can be removed from 
3.12 earliest.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43162>
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