Fix TypeForm inference in union parameters - #21966
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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Sep 11, 2026
`--superseded-by` was stored and never shown, so an unfiled run overtaken upstream read as plain `unsubmitted`. Two such runs are on disk: the starlette fix superseded by Kludex/starlette#3498 and the mypy#21964 fix superseded by python/mypy#21966, which the new competitor check found before filing. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Fixes #21964
Summary
Tests
PATH=".venv/bin:$PATH" .venv/bin/python runtests.py check-typeform.testPATH=".venv/bin:$PATH" .venv/bin/python -m mypy --config-file mypy_self_check.ini mypy/checkexpr.pygit diff --checkAI assistance: OpenAI Codex helped investigate and implement this change; I reviewed the final diff and tests.