Add TODO.

src/compare/diff.rs

@@ -537,6 +537,7 @@ fn compare_heading<'b, 's>(
     let mut child_status = Vec::new();
     let mut message = None;
 
+    // TODO: Add checks to compare values for additional properties.
     let additional_property_names: Vec<String> = rust
         .get_additional_properties()
         .map(|node_property| format!(":{}", node_property.property_name.to_uppercase()))