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Fix TypedDict indexing with literal keys in comprehensions (#21556)

Fixes #19317 

Uses exsiting index narrowing in for-loop. Previous PR:
https://github.com/python/mypy/pull/18014
J
Jingchen Ye committed
94838b0f9c3b37af02e1924b60254a49bb138eb7
Parent: c2fd9d3
Committed by GitHub <noreply@github.com> on 5/29/2026, 11:19:31 AM