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This commit changes `AsSlice` to work on unsized types, and changes the `impl` for `&[T]` to `[T]`. Aside from making the trait more general, this also helps some ongoing work with method resolution changes. This is a breaking change: code that uses generics bounded by `AsSlice` will have to change. In particular, such code previously often took arguments of type `V` where `V: AsSlice<T>` by value. These should now be taken by reference: ```rust fn foo<Sized? V: AsSlice<T>>(v: &V) { .. } ``` A few std lib functions have been changed accordingly. [breaking-change]
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