Fix 1.20 regression: type narrowing lost on reassignment with generator/ternary expressions#21280

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parinporecha:fix/issue-21273-walrus-guard-regression

Commits on Apr 21, 2026

Fix 1.20 regression: use explicit walrus check instead of binder version guard
parinporecha
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test: cover generator ternary narrowing regression
parinporecha
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[pre-commit.ci] auto fixes from pre-commit.com hooks
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