Fix iteration over union (when self type is involved) #17976
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Fixes python#17945
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Diff from mypy_primer, showing the effect of this PR on open source code: streamlit (https://github.com/streamlit/streamlit)
- lib/tests/streamlit/elements/lib/column_config_utils_test.py:385:30: error: Invalid index type "str" for "Union[ColumnConfig, str, None]"; expected type "Union[SupportsIndex, slice]" [index]
+ lib/tests/streamlit/elements/lib/column_config_utils_test.py:385:30: error: Invalid index type "str" for "str"; expected type "Union[SupportsIndex, slice]" [index]
spack (https://github.com/spack/spack)
- lib/spack/spack/util/spack_yaml.py:490: error: Item "dict_items[Any, Any]" of "Iterator[tuple[Any, Any]] | dict_items[Any, Any] | enumerate[Any]" has no attribute "__next__" [union-attr]
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Fixes #17945