What to do with the deprecation warnings for dash-separated and uppercase keys in `setup.cfg` after due date?

[abravalheri]

When working recently on setuptools changes I noticed that some deprecations have reached due date:

setuptools/setuptools/dist.py

Lines 499 to 509 in 3106af0

	if '-' in opt:
	SetuptoolsDeprecationWarning.emit(
	"Invalid dash-separated options",
	f"""
	Usage of dash-separated {opt!r} will not be supported in future
	versions. Please use the underscore name {underscore_opt!r} instead.
	""",
	see_docs="userguide/declarative_config.html",
	due_date=(2024, 9, 26),
	# Warning initially introduced in 3 Mar 2021
	)

setuptools/setuptools/dist.py

Lines 521 to 534 in 3106af0

	if section != 'metadata' or opt.islower():
	return opt
	lowercase_opt = opt.lower()
	SetuptoolsDeprecationWarning.emit(
	"Invalid uppercase configuration",
	f"""
	Usage of uppercase key {opt!r} in {section!r} will not be supported in
	future versions. Please use lowercase {lowercase_opt!r} instead.
	""",
	see_docs="userguide/declarative_config.html",
	due_date=(2024, 9, 26),
	# Warning initially introduced in 6 Mar 2021
	)

The problem is that I don't think that the community have moved towards fixing those usages, as indicated by this GitHub search: https://github.com/search?q=%2Fauthor-email%7Cmaintainer-email%7Clong-description%7Clicense-file%2F+path%3Asetup.cfg&type=code&p=5. Disclaimer: I don't know if these results use the setup.cfg format of a tool that is different than setuptools and accepts dashes (I don't know for example if pbr accepts dashes).

What should we do now that we are arriving the end of the deprecation period? Should we simply transform the warnings in errors? Would that be too disruptive in the community?

[herebebeasties]

What should we do now that we are arriving the end of the deprecation period? Should we simply transform the warnings in errors? Would that be too disruptive in the community?

I think you've answered your own question today pretty conclusively.

I would personally apply Postel's Law here: "Be liberal in what you accept, and conservative in what you send."

I.e. Auto-replace - to _ for all the keys, so that you can fix user errors as broadly as possible and Do The Right Thing Regardless.