gh-140281: update 3.14 previsions for the free-threaded build

[Krishna-web-hub]

gh-140281: Doc: Update free-threading how-to

Key changes:

• Updates text on immortal objects from "expected to be addressed" to "Work to further reduce...".
• Updates performance overhead text from "expected to be reduced" to "was reduced" and notes that further reduction "remains an active development goal".
• A NEWS entry has been added.

[python-cla-bot]

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[ZeroIntensity]

@colesbury Did you want to keep the information from the old 3.13 FT build here?

[ZeroIntensity]

Please remove this. We only need blurb entries for changes to the documentation build. I'll apply skip news on this for you.

[ZeroIntensity]

Immortalization of these objects was removed entirely in the 3.14 release, but this reads as if some of it was left.

[Krishna-web-hub]

Thanks @ZeroIntensity , for the information i will be doing the changes accordingly.

[colesbury]

Thanks for bringing this up. I think this needs to be reworked a bit more and we should limit it to 3.14. I don't think we need to discuss 3.13.

• Immortalization: It's just code constants: numeric and string literals and tuple literals of those constants. Plus sys.intern
• Frame objects: Should no longer crash, but we should verify this
• Iterators: Should no longer crash

[Krishna-web-hub]

Hi @colesbury, thanks for the specific feedback.
I've just pushed a new, clean commit that addresses all your points:

• The documentation has been refocused on 3.14, and the outdated 3.13 comparisons have been removed.

• I've corrected the "Immortalization" section to match your clarification (limited to code constants, literals, and sys.intern).

• The warnings about "Frame objects" and "Iterators" crashing have also been removed.

[Krishna-web-hub]

hello @colesbury ,
I have done the changes you said about you can see and if you need any more changes then please tell me.