[issue15849] PEP 3121, 384 Refactoring applied to xx module

[Stefan Krah]

Stefan Krah added the comment:

I think we should perhaps leave the xxmodule as an example for
static types and create another pep-384 version that mentions
*potential* performance traps.

Of course many modules won't suffer from this, but first-time
extension writers tend to paste from the examples and should
know the alternatives if they happen to write a performance
sensitive application.

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nosy: +skrah

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