feat: no clone in JIT

IMPORTANT: should not drop or create values in JIT anymore

src/stack.rs

@@ -35,10 +35,7 @@ impl<T, const CAP: usize> Stack<T, CAP> {
     pub fn push(&mut self, item: T) -> Result<()> {
         self.items
             .get_mut(self.top)
-            .map_or_else(
-                || Err(Error::EvalError("stack overflow".to_string())),
-                Ok,
-            )?
+            .map_or_else(|| Err(Error::EvalError("stack overflow".to_string())), Ok)?
             .write(item);
         self.top += 1;
         Ok(())