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

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ljharb wants to merge 1 commit into microsoft:main from ljharb:lib-string-tocase-literal-types

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

Narrow String#toLowerCase/toUpperCase return types via Lowercase/Uppe…

Codecov / codecov/project succeeded May 5, 2026 in 0s

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93.96216% (+0.00098%) compared to f350b52

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