diff --git a/lib/class.js b/lib/class.js
index 4996bf5..9579298 100644
--- a/lib/class.js
+++ b/lib/class.js
@@ -619,10 +619,7 @@ function createMeta( func, parent_id )
     // copy the parent prototype's metadata if it exists (inherit metadata)
     if ( parent_meta )
     {
-        // todo: deep (1) util.clone() when available
-        class_meta[ id ] = {
-            implemented: util.clone( parent_meta.implemented ),
-        };
+        class_meta[ id ] = util.clone( parent_meta, true );
     }
     else
     {