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Added the following (all unstable): * Defaulted type pararameter `A: Allocator`. * `UniqueRc::new_in()`. * `T: ?Sized` where possible. * `impl CoerceUnsized for UniqueRc`. * Drive-by doc polish: links and periods at the end of sentences. These changes are motivated by supporting the implementation of unsized `Rc::make_mut()` (PR #116113), but are also intended to be obvious generalizations of `UniqueRc` to support the things `Rc` does.