diff --git a/pitfall/ptest/test20.rkt b/pitfall/ptest/test20.rkt
index 7bc5cd92..c0832ec0 100644
--- a/pitfall/ptest/test20.rkt
+++ b/pitfall/ptest/test20.rkt
@@ -1,4 +1,4 @@
-#lang racket/base
+#lang debug racket/base
 (require pitfall/pdftest)
 
 ;; subset OTF font
diff --git a/pitfall/ptest/test20a.rkt b/pitfall/ptest/test20a.rkt
new file mode 100644
index 00000000..7a4f92b2
--- /dev/null
+++ b/pitfall/ptest/test20a.rkt
@@ -0,0 +1,37 @@
+#lang racket
+
+
+
+(require fontland/table/cff/cff-top pitfall/check-pdf racket/dict racket/promise)
+
+(define (dump val)
+  (cond
+    [(promise? val) 'promise-omitted]
+    [(dict? val)
+     (for/list ([(k v) (in-dict (sort (dict->list val) #:key car symbol<?))])
+       (list k (dump v)))]
+    [(list? val) (map dump val)]
+    [else val]))
+
+(define misses null)
+(define (cmp v1 v2)
+  (cond
+    [(and (list? v1) (list? v2))
+     (and
+      (= (length v1) (length v2))
+      (for/and ([x1 (in-list v1)]
+                [x2 (in-list v2)])
+        (unless (cmp x1 x2)
+          (set! misses (cons (list v1 x1 v2 x2) misses)))))]
+    [else (equal? v1 v2)]))
+
+(define ibs1 (dict-ref (dict-ref (pdf->dict "test20.pdf") 8) 'stream))
+(bytes-length ibs1)
+(define cfftop1 (dump (send CFFTop decode (open-input-bytes ibs1))))
+
+(define ibs2 (dict-ref (dict-ref (pdf->dict "test20rkt.pdf") 8) 'stream))
+(bytes-length ibs2)
+(define cfftop2 (dump (send CFFTop decode (open-input-bytes ibs2))))
+
+(cmp cfftop1 cfftop2)
+misses
\ No newline at end of file