commands: force external users to interact with requests and responses through Command trait

src/commands.rs

@@ -48,7 +48,7 @@ use thiserror::Error;
 use tokio::io::{AsyncBufReadExt, AsyncRead, AsyncWrite, AsyncWriteExt, BufReader};
 
 /// A trait modelling a single MPD command request.
-pub trait CommandRequest
+pub(crate) trait CommandRequest
 where
     Self: Sized,
 {
@@ -102,7 +102,7 @@ where
 }
 
 /// A trait modelling a single MPD command response.
-pub trait CommandResponse
+pub(crate) trait CommandResponse
 where
     Self: Sized,
 {