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c98960d053
# Description As @YizhePKU pointed out, the [Rust API guidelines](https://rust-lang.github.io/api-guidelines/interoperability.html#generic-readerwriter-functions-take-r-read-and-w-write-by-value-c-rw-value) recommend that generic functions take readers and writers by value and not by reference. This PR changes `copy_with_interupt` and few other places to take owned `Read` and `Write` instead of mutable references.
nu-protocol
The nu-protocol crate holds the definitions of structs/traits that are used throughout Nushell. This gives us one way to expose them to many other crates, as well as make these definitions available to each other, without causing mutually recursive dependencies.