Added value method to get the generic type from TypedArenaPtr

src/arena.rs

@@ -187,6 +187,12 @@ impl ArenaHeader {
 #[derive(Debug)]
 pub struct TypedArenaPtr<T: ?Sized>(ptr::NonNull<T>);
 
+impl TypedArenaPtr<Integer> {
+    pub fn value(&self) -> Integer {
+        unsafe { self.0.as_ref().clone() }
+    }
+}
+
 impl<T: ?Sized + PartialOrd> PartialOrd for TypedArenaPtr<T> {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
         (**self).partial_cmp(&**other)