Retrieving attributed string attribute values should not use identity casts#1290
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jmschonfeld merged 1 commit intoswiftlang:mainfrom May 14, 2025
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…use identity casts
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@swift-ci please test |
parkera
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May 14, 2025
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This reverts a small portion of #1287. It's not always possible to use an identity cast here, because in some cases (such as catalyst applications where
AttributedStrings interchangeably use both UIKitUIColorand AppKitNSColorattributes) we do rely on dynamic casting behavior. The dynamic cast should attempt an identity cast first so this shouldn't have a strong impact on the overall performance win since we still avoid the optional boxing in__equalAttributesand retain the performance wins from the runs view.