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Narrow String#toLowerCase/toUpperCase return types via Lowercase/Uppercase#63460

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ljharb:lib-string-tocase-literal-types
Open

Narrow String#toLowerCase/toUpperCase return types via Lowercase/Uppercase#63460
ljharb wants to merge 1 commit into
microsoft:mainfrom
ljharb:lib-string-tocase-literal-types

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Commits on May 5, 2026