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f55ed6aa70
Closes https://github.com/dart-lang/sdk/issues/55256
d7ce346fba added code to avoid the less performant boxing of JSBoxedDartObject and instead use backend-specific logic to externalize and internalize the UniqueRef until we get a better solution from dart:js_interop. On the JS backends, this relied on casting to and from JSAny, as its representation type is just Object. However, this callback that takes in the UniqueRef as an arg is still typed as accepting JSBoxedDartObject, leading to a cast failure on the JS backends, since the representation type is JSObject.
The fix is to use JSAny. On dart2wasm, this makes no difference, as the underlying representation type does not change.