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Support a small amount of generic converters for attrs - #22206

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A5rocks:attrs-generic-converters
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A5rocks wants to merge 1 commit into
python:masterfrom
A5rocks:attrs-generic-converters

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@A5rocks A5rocks commented Oct 14, 2026 •

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See #8625.

To be honest I don't see why we can't recurse on the converter return type along with the attribute type, and then set all the typevars we see based on the other's type. I didn't do that since I don't know the right visitor to do so, but presumably I'm missing something that makes this harder?

@A5rocks A5rocks changed the title Support a small amount of #8625 Support a small amount of generic converters for attrs Oct 14, 2026
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Diff from mypy_primer, showing the effect of this PR on open source code:

core (https://github.com/home-assistant/core)
+ homeassistant/helpers/device_registry.py:1042: error: Unused "type: ignore" comment  [unused-ignore]
+ homeassistant/helpers/device_registry.py:2187: error: Unused "type: ignore" comment  [unused-ignore]
+ homeassistant/helpers/device_registry.py:4429: error: Unused "type: ignore" comment  [unused-ignore]

scipy-stubs (https://github.com/scipy/scipy-stubs)
- tests/misc/test_submodules_empty.pyi:3: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports

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