Fix narrowing for AbstractSet and Mapping#21352
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JukkaL merged 5 commits intopython:masterfrom Apr 28, 2026
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This builds on the tech I added a few days ago in python#21281
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Diff from mypy_primer, showing the effect of this PR on open source code: xarray (https://github.com/pydata/xarray)
- xarray/tests/test_dataarray.py:291: error: Unused "type: ignore" comment [unused-ignore]
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This builds on the tech I added a few days ago in #21281. So we can also get rid of frozenset special case from #21151. I believe we account for all the dangerous_comparison logic now