Some structs should be `pub(crate)`: - https://github.com/toby/serde-bencode/blob/master/src/de.rs#L13 - https://github.com/toby/serde-bencode/blob/master/src/ser.rs#L87 - https://github.com/toby/serde-bencode/blob/master/src/ser/string.rs#L24
