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improve types for `metadata` and other dict-like types (#1785)

* improve types for metadata and other dict-like types

* update name

* update test

* fix lint
D
David Brownman committed
628da69439e802143680994a010d1ef2285fa4ca
Parent: 601875a
Committed by GitHub <noreply@github.com> on 4/1/2026, 5:37:55 PM