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https://peps.python.org/pep-0685/#specification says both that all comparisons should be done with normalized extra names, and that normalized extra names should be written to metadata.
Simplest and surest approach seems to be just to deal with normalized names everywhere.
Fixes python-poetry/poetry#6321.
will cause CI failures in the downstream tests because poetry now records normalized extra names in lockfiles. I think that's correct and will follow up with a poetry MR to fix the unit tests against this.
However this presents some poetry / poetry-core challenges re merge order and version numbering. As in other MRs, I'd advocate for allowing such things and being comfortable going 2.0 here - though even then the cross-repository pipelines want some disentangling.