Serialize option enums to u8, for backward compatibility.

enemize/src/bosses/mod.rs

@@ -1,9 +1,12 @@
 use std::marker::PhantomData;
 
+use serde::{Deserialize, Serialize};
+
 use crate::InvalidEnumError;
 
-#[derive(Debug)]
+#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
 #[repr(u8)]
+#[serde(into = "u8", try_from = "u8")]
 pub enum BossType {
     Kholdstare,
     Moldorm,
@@ -22,6 +25,29 @@ pub enum BossType {
     NoBoss = 255,
 }
 
+impl From<BossType> for u8 {
+    fn from(t: BossType) -> u8 {
+        use BossType::*;
+
+        match t {
+            Kholdstare => 0,
+            Moldorm => 1,
+            Mothula => 2,
+            Vitreous => 3,
+            Helmasaur => 4,
+            Armos => 5,
+            Lanmola => 6,
+            Blind => 7,
+            Arrghus => 8,
+            Trinexx => 9,
+            Agahnim => 10,
+            Agahnim2 => 11,
+            Ganon => 12,
+            NoBoss => 255,
+        }
+    }
+}
+
 impl TryFrom<u8> for BossType {
     type Error = InvalidEnumError<Self>;