Narrow for type expr comparisons to type exprs#20639
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JukkaL merged 5 commits intopython:masterfrom Jan 23, 2026
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Diff from mypy_primer, showing the effect of this PR on open source code: pandas (https://github.com/pandas-dev/pandas)
+ pandas/core/arrays/base.py:1558: error: Redundant cast to "ExtensionArray" [redundant-cast]
+ pandas/core/indexes/datetimelike.py:279: error: Unused "type: ignore" comment [unused-ignore]
ibis (https://github.com/ibis-project/ibis)
- ibis/common/patterns.py:658: error: "Pattern" has no attribute "type" [attr-defined]
- ibis/common/patterns.py:934: error: "Pattern" has no attribute "patterns" [attr-defined]
rotki (https://github.com/rotki/rotki)
+ rotkehlchen/history/events/structures/base.py:209: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:210: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:211: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:212: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:213: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:214: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:215: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:216: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:217: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:218: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:219: error: Unused "type: ignore" comment [unused-ignore]
+ rotkehlchen/history/events/structures/base.py:220: error: Unused "type: ignore" comment [unused-ignore]
pip (https://github.com/pypa/pip)
+ src/pip/_internal/utils/misc.py:551: error: Redundant cast to "HiddenText" [redundant-cast]
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I refactored the logic for type(x) narrowing in #20634 , but left this piece out since it has material semantic impact
Fixes #11952
Fixes #20275