PEP 738: Better specify platform tags

[di]

Found this when working on pypi/warehouse#17549:

• Better specify the upper/lower bounds for the API version;
• Explain that the architectures must be normalized to be included in valid wheel tags;
• Strengthen the requirement that package indices must add support;

cc @mhsmith @encukou.

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📚 Documentation preview 📚: https://pep-previews--4250.org.readthedocs.build/

[AA-Turner]

Generally we tend not to make substantive changes to Final PEPs, though it may be that there's nowhere better to record this information. There's no information on packaging tags here, and packaging.p.o doesn't seem to have specific information on Android.

A

[mhsmith]

Thanks for addressing this in Warehouse. Now that the PEP is Final, I think a more appropriate place to maintain this information would be this page, which already contains details of the manylinux tag format.

Although the minimum API level for Python 3.13 is 21, I don't think we should specify any lower bound for the tag format, because there are wheels in circulation for older versions of Python and Android.

[di]

@mhsmith OK, I filed pypa/packaging.python.org#1801 and marked pypi/warehouse#17549 as blocked on that.