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Sync typeshed - #21021
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hauntsaninja merged 9 commits intoMar 23, 2026
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Sync typeshed#21021hauntsaninja merged 9 commits into
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Source commit: python/typeshed@f8f0794
This is allegedly causing large performance problems, see 13821 typeshed/8231 had zero hits on mypy_primer, so it's not the worst thing to undo. Patching this in typeshed also feels weird, since there's a more general soundness issue. If a typevar has a bound or constraint, we might not want to solve it to a Literal. If we can confirm the performance regression or fix the unsoundness within mypy, I might pursue upstreaming this in typeshed. (Reminder: add this to the sync_typeshed script once merged)
The plugin provides superior type checking: #13987 (comment) A manual cherry-pick of e437cdf.
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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/core_config.py:529: error: Argument 1 of "discard" is incompatible with supertype "builtins.set"; supertype defines the argument type as "object" [override]
+ homeassistant/core_config.py:529: note: This violates the Liskov substitution principle
+ homeassistant/core_config.py:529: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
+ homeassistant/components/eafm/__init__.py:28: error: Unused "type: ignore" comment [unused-ignore]
rotki (https://github.com/rotki/rotki)
+ rotkehlchen/chain/evm/decoding/aave/v3/decoder.py:583: error: Unused "type: ignore" comment [unused-ignore]
artigraph (https://github.com/artigraph/artigraph)
- tests/arti/internal/test_mappings.py:40: error: No overload variant of "__or__" of "dict" matches argument type "frozendict[Never, int]" [operator]
+ tests/arti/internal/test_mappings.py:40: error: Unsupported operand types for | ("dict[str, int]" and "frozendict[Never, int]") [operator]
- tests/arti/internal/test_mappings.py:40: note: Possible overload variants:
- tests/arti/internal/test_mappings.py:40: note: def __or__(self, dict[str, int], /) -> dict[str, int]
- tests/arti/internal/test_mappings.py:40: note: def [_T1, _T2] __or__(self, dict[_T1, _T2], /) -> dict[str | _T1, int | _T2]
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homeassistant:
rotki and artigraph: |
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hauntsaninja
approved these changes
Mar 23, 2026
This was referenced Apr 1, 2026
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Sync typeshed
Source commit:
python/typeshed@f8f0794
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