Extended type narrowing for the X is L and X is not L type guard …
#9759
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…pattern. Previously, narrowing was performed only when `L` was an enum or bool literal. Narrowing is also now applied for other literal types but only in the positive (`if`) direction. This addresses #9758.
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Diff from mypy_primer, showing the effect of this PR on open source code: xarray (https://github.com/pydata/xarray)
- /tmp/mypy_primer/projects/xarray/xarray/namedarray/core.py:151:24 - error: Argument of type "_DimsLike | _Dims | Default" cannot be assigned to parameter "dims" of type "_DimsLike" in function "__init__"
- Type "_DimsLike | _Dims | Default" is not assignable to type "_DimsLike"
- Type "Default" is not assignable to type "_DimsLike"
- "Default" is not assignable to "str"
- "Default" is incompatible with protocol "Iterable[_Dim]"
- "__iter__" is not present (reportArgumentType)
- /tmp/mypy_primer/projects/xarray/xarray/tests/test_namedarray.py:437:39 - error: Argument of type "_DimsLike | _Dims | Default" cannot be assigned to parameter "dims" of type "_DimsLike" in function "__init__"
- Type "_DimsLike | _Dims | Default" is not assignable to type "_DimsLike"
- Type "Default" is not assignable to type "_DimsLike"
- "Default" is not assignable to "str"
- "Default" is incompatible with protocol "Iterable[_Dim]"
- "__iter__" is not present (reportArgumentType)
- /tmp/mypy_primer/projects/xarray/xarray/tests/test_namedarray.py:498:39 - error: Argument of type "_DimsLike | _Dims | Default" cannot be assigned to parameter "dims" of type "_DimsLike" in function "__init__"
- Type "_DimsLike | _Dims | Default" is not assignable to type "_DimsLike"
- Type "Default" is not assignable to type "_DimsLike"
- "Default" is not assignable to "str"
- "Default" is incompatible with protocol "Iterable[_Dim]"
- "__iter__" is not present (reportArgumentType)
- 2476 errors, 93 warnings, 0 informations
+ 2473 errors, 93 warnings, 0 informations
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…pattern. Previously, narrowing was performed only when
Lwas an enum or bool literal. Narrowing is also now applied for other literal types but only in the positive (if) direction. This addresses #9758.