Guido van Rossum <gvanros...@gmail.com> added the comment:

And that’s a problem. There needs to be a recommendation on what to do for code 
that spans 3.9 and 3.10. What should users do otherwise? Drop 3.9 as soon as 
they introduce 3.10 support? Withhold 3.10 support until 3.9 reaches EOL?

IOW you can’t just break backward compatibility. (That’s why PEP 563 was rolled 
back in the first place.)

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<https://bugs.python.org/issue43901>
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