fix: exit codes are of u8, not i32

lib/exit.rs

@@ -4,7 +4,7 @@ use event_listener::Event;
 
 #[derive(Debug, Clone)]
 pub(crate) struct Exit {
-    code: Rc<Cell<Option<i32>>>,
+    code: Rc<Cell<Option<u8>>>,
     event: Rc<Event>,
 }
 
@@ -16,12 +16,12 @@ impl Exit {
         }
     }
 
-    pub fn set(&self, code: i32) {
+    pub fn set(&self, code: u8) {
         self.code.set(Some(code));
         self.event.notify(usize::MAX);
     }
 
-    pub fn get(&self) -> Option<i32> {
+    pub fn get(&self) -> Option<u8> {
         self.code.get()
     }
 

lib/functions.rs

@@ -230,7 +230,7 @@ impl<'lua> Functions<'lua> {
         let exit_env = lua.create_table_from(vec![
             (
                 "exit",
-                lua.create_function(|lua, code: Option<i32>| {
+                lua.create_function(|lua, code: Option<u8>| {
                     let _span = tracing::trace_span!("Scheduler::fn_exit").entered();
                     let code = code.unwrap_or_default();
                     lua.set_exit_code(code);

lib/scheduler.rs

@@ -167,7 +167,7 @@ impl<'lua> Scheduler<'lua> {
         Gets the exit code for this scheduler, if one has been set.
     */
     #[must_use]
-    pub fn get_exit_code(&self) -> Option<i32> {
+    pub fn get_exit_code(&self) -> Option<u8> {
         self.exit.get()
     }
 
@@ -176,7 +176,7 @@ impl<'lua> Scheduler<'lua> {
 
         This will cause [`Scheduler::run`] to exit immediately.
     */
-    pub fn set_exit_code(&self, code: i32) {
+    pub fn set_exit_code(&self, code: u8) {
         self.exit.set(code);
     }
 

lib/traits.rs

@@ -80,7 +80,7 @@ pub trait LuaSchedulerExt<'lua> {
 
         Panics if called outside of a running [`Scheduler`].
     */
-    fn set_exit_code(&self, code: i32);
+    fn set_exit_code(&self, code: u8);
 
     /**
         Pushes (spawns) a lua thread to the **front** of the current scheduler.
@@ -281,7 +281,7 @@ pub trait LuaSpawnExt<'lua> {
 }
 
 impl<'lua> LuaSchedulerExt<'lua> for Lua {
-    fn set_exit_code(&self, code: i32) {
+    fn set_exit_code(&self, code: u8) {
         let exit = self
             .app_data_ref::<Exit>()
             .expect("exit code can only be set from within an active scheduler");