Add impl AsObjectArg<T> for &Option<Gd<T>> (outer ref)

godot-core/src/obj/object_arg.rs

@@ -114,6 +114,27 @@ where
     }
 }
 
+// Exists to not require `.as_ref()` calls when passing options.
+impl<T, U> AsObjectArg<T> for &Option<U>
+where
+    T: GodotClass + Bounds<Declarer = bounds::DeclEngine>,
+    for<'a> &'a U: AsObjectArg<T>,
+{
+    fn as_object_arg(&self) -> ObjectArg<T> {
+        match self {
+            Some(obj) => obj.as_object_arg(),
+            None => ObjectArg::null(),
+        }
+    }
+
+    fn consume_arg(self) -> ObjectCow<T> {
+        match self {
+            Some(obj) => obj.consume_arg(),
+            None => Gd::null_arg().consume_arg(),
+        }
+    }
+}
+
 impl<T> AsObjectArg<T> for ObjectNullArg<T>
 where
     T: GodotClass + Bounds<Declarer = bounds::DeclEngine>,

itest/rust/src/object_tests/object_arg_test.rs

@@ -67,6 +67,16 @@ fn object_arg_option_borrowed() {
     });
 }
 
+#[itest]
+fn object_arg_option_borrowed_outer() {
+    with_objects(|manual, refc| {
+        let db = ClassDb::singleton();
+        let a = db.class_set_property(&Some(manual), "name", &Variant::from("hello"));
+        let b = db.class_set_property(&Some(refc), "value", &Variant::from(-123));
+        (a, b)
+    });
+}
+
 #[itest]
 fn object_arg_option_borrowed_mut() {
     with_objects(|mut manual, mut refc| {