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Avoid unnecessary sum type expansion when narrowing - #22252
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conditional_types already expands bool and enum types when the target is a matching literal. Authored by Codex
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Diff from mypy_primer, showing the effect of this PR on open source code: sphinx (https://github.com/sphinx-doc/sphinx)
- sphinx/testing/util.py:80:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
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conditional_types already expands bool and enum types when the target is a matching literal.
Authored by Codex