feat: implement PredicateBoxExt for ?Sized

In particular, this makes `predicate::str::contains(...).boxed()` work.
assert-rs · Dec 17, 2024 · 29c223f · 29c223f
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 <!-- next-header -->
 ## [Unreleased] - ReleaseDate
 
+### Added
+
+- The `boxed` function is now available for predicates with an `Item` type that
+  is not `Sized`.
+
 ## [3.1.2] - 2024-07-25
 
 ## [3.1.1] - 2024-07-25

diff --git a/src/boxed.rs b/src/boxed.rs
@@ -114,7 +114,7 @@ where
     }
 }
 
-impl<P, Item> PredicateBoxExt<Item> for P where P: Predicate<Item> {}
+impl<P, Item: ?Sized> PredicateBoxExt<Item> for P where P: Predicate<Item> {}
 
 #[cfg(test)]
 mod test {