diff --git a/src/nextjournal/markdown/impl.clj b/src/nextjournal/markdown/impl.clj
index 670d51a..e718fa8 100644
--- a/src/nextjournal/markdown/impl.clj
+++ b/src/nextjournal/markdown/impl.clj
@@ -211,6 +211,18 @@
       z/up (z/edit assoc :type :todo-list)
       z/down z/rightmost))
 
+(def clazzes (atom #{}))
+
+(comment
+  @clazzes
+  )
+
+(def ^:private visitChildren-meth
+  ;; cached reflection only happens once
+  (delay (let [meth (.getDeclaredMethod AbstractVisitor "visitChildren" (into-array [Node]))]
+           (.setAccessible meth true)
+           meth)))
+
 (defn node->data [{:as ctx-in :keys [footnotes]} ^Node node]
   (assert (:type ctx-in) ":type must be set on initial doc")
   (assert (:content ctx-in) ":content must be set on initial doc")
@@ -249,10 +261,12 @@
 
                    ;; else branch nodes
                    (if (get-method open-node (class node))
-                     (with-tight-list node
-                       (swap! !ctx open-node node)
-                       (proxy-super visitChildren node)
-                       (swap! !ctx close-node node))
+                     (do
+                       (swap! clazzes conj (class node))
+                       (with-tight-list node
+                         (swap! !ctx open-node node)
+                         (.invoke ^java.lang.reflect.Method @visitChildren-meth this (into-array Object [node]))
+                         (swap! !ctx close-node node)))
                      (prn ::not-implemented node))))))
 
     (let [{:as ctx-out :keys [doc title toc footnotes] ::keys [label->footnote-ref]} (deref !ctx)]
diff --git a/src/nextjournal/markdown/impl/types.clj b/src/nextjournal/markdown/impl/types.clj
index df3ab70..6f9f4de 100644
--- a/src/nextjournal/markdown/impl/types.clj
+++ b/src/nextjournal/markdown/impl/types.clj
@@ -1,14 +1,18 @@
-(ns nextjournal.markdown.impl.types
-  (:import [nextjournal.markdown.impl.types CustomNode]))
+(ns nextjournal.markdown.impl.types)
 
 ;; See also
 ;; https://github.com/noties/Markwon/blob/master/markwon-ext-latex/src/main/java/io/noties/markwon/ext/latex/JLatexMathBlockParser.java
 
 (set! *warn-on-reflection* true)
 
+(definterface CustomNode
+  (getLiteral [])
+  (setLiteral [v])
+  (nodeType []))
+
 (defn ->InlineFormula [lit]
   (let [state (atom lit)]
-    (proxy [org.commonmark.node.CustomNode CustomNode] []
+    (proxy [org.commonmark.node.CustomNode nextjournal.markdown.impl.types.CustomNode] []
       (getLiteral [] @state)
       (nodeType [] :inline-formula))))
 
@@ -16,14 +20,14 @@
   ([] (->BlockFormula nil))
   ([lit]
    (let [state (atom lit)]
-     (proxy [org.commonmark.node.CustomBlock CustomNode] []
+     (proxy [org.commonmark.node.CustomBlock nextjournal.markdown.impl.types.CustomNode] []
        (getLiteral [] @state)
        (setLiteral [v] (do (reset! state v)
                            this))
        (nodeType [] :block-formula)))))
 
 (defn ->ToC []
-  (proxy [org.commonmark.node.CustomBlock CustomNode] []
+  (proxy [org.commonmark.node.CustomBlock nextjournal.markdown.impl.types.CustomNode] []
     (nodeType [] :toc)))
 
 (defn setLiteral [^CustomNode n lit]