add Byte to replace Int when appropriate

mers_lib/src/data/int.rs

@@ -2,7 +2,7 @@ use std::{any::Any, fmt::Display, sync::Arc};
 
 use super::{MersData, MersType, Type};
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Copy)]
 pub struct Int(pub isize);
 
 impl MersData for Int {

mers_lib/src/data/mod.rs

@@ -5,6 +5,7 @@ use std::{
 };
 
 pub mod bool;
+pub mod byte;
 pub mod float;
 pub mod function;
 pub mod int;