[do not review] Avoid narrowing TypeType#20636
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hauntsaninja wants to merge 1 commit intopython:masterfrom
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[do not review] Avoid narrowing TypeType#20636hauntsaninja wants to merge 1 commit intopython:masterfrom
hauntsaninja wants to merge 1 commit intopython:masterfrom
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This relates to changes made in python#20492
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Diff from mypy_primer, showing the effect of this PR on open source code: spark (https://github.com/apache/spark)
- python/pyspark/mllib/regression.py:282: error: Unused "type: ignore" comment [unused-ignore]
- python/pyspark/mllib/regression.py:282: error: Incompatible return value type (got "LogisticRegressionModel", expected "LM") [return-value]
- python/pyspark/mllib/regression.py:282: note: Error code "return-value" not covered by "type: ignore" comment
zulip (https://github.com/zulip/zulip)
- analytics/views/stats.py:577: error: Incompatible return value type (got "QuerySet[RealmCount, RealmCount]", expected "QuerySet[CountT, CountT]") [return-value]
- analytics/views/stats.py:579: error: Incompatible return value type (got "QuerySet[UserCount, UserCount]", expected "QuerySet[CountT, CountT]") [return-value]
- analytics/views/stats.py:581: error: Incompatible return value type (got "QuerySet[StreamCount, StreamCount]", expected "QuerySet[CountT, CountT]") [return-value]
- analytics/views/stats.py:583: error: Incompatible return value type (got "QuerySet[InstallationCount, InstallationCount]", expected "QuerySet[CountT, CountT]") [return-value]
- analytics/views/stats.py:585: error: Incompatible return value type (got "QuerySet[RemoteInstallationCount, RemoteInstallationCount]", expected "QuerySet[CountT, CountT]") [return-value]
- analytics/views/stats.py:587: error: Incompatible return value type (got "QuerySet[RemoteRealmCount, RemoteRealmCount]", expected "QuerySet[CountT, CountT]") [return-value]
pandera (https://github.com/pandera-dev/pandera)
+ tests/pandas/test_schema_components.py:590: error: "Iterable[Any]" has no attribute "tolist" [attr-defined]
xarray (https://github.com/pydata/xarray)
+ xarray/indexes/nd_point_index.py: note: In member "from_variables" of class "NDPointIndex":
+ xarray/indexes/nd_point_index.py:271: error: Incompatible types in assignment (expression has type "type[ScipyKDTreeAdapter]", variable has type "type[T_TreeAdapter]") [assignment]
artigraph (https://github.com/artigraph/artigraph)
+ src/arti/views/__init__.py:98: error: Incompatible types in assignment (expression has type "type[View] | None", variable has type "type[Self]") [assignment]
+ src/arti/views/__init__.py:102: error: Incompatible types in assignment (expression has type "type[View] | None", variable has type "type[Self]") [assignment]
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Jan 28, 2026
Maybe a little ad hoc, but avoids some of the undesirable primer regression from python#20492 Closes python#20636
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This relates to changes made in #20492
It undoes some of the new narrowing, which has both good and bad effects, i.e. if we merge this, we'll need to re-open some issues
Opening this mainly as a way to keep an eye on primer as I try out a few things in this space