diff --git a/pitfall/pitfall/kit/document.rkt b/pitfall/pitfall/kit/document.rkt
index 3ee97160..c5dc604d 100644
--- a/pitfall/pitfall/kit/document.rkt
+++ b/pitfall/pitfall/kit/document.rkt
@@ -1,10 +1,10 @@
-#lang racket/base
+#lang sugar/debug racket/base
 (require racket/class racket/draw br/list racket/list racket/format racket/port)
 (require sugar/debug)
 (provide PDFDocument)
 
-(require "reference.rkt" "struct.rkt" "object.rkt" "page.rkt" "helper.rkt")
-(require "mixins/vector.rkt")
+(require "reference.rkt" "struct.rkt" "object.rkt" "page.rkt" "helper.rkt" "params.rkt")
+(require "vector.rkt")
 
 (define PDFDocument
   ;; actually is an instance of readable.Stream, which is an input port
@@ -58,7 +58,9 @@
     (field [(@info info) (mhash
                           'Producer "PitfallKit"
                           'Creator "PitfallKit"
-                          'CreationDate #;(seconds->date (current-seconds)) 0)]) ; debug val
+                          'CreationDate (seconds->date (if (current-debug)
+                                                           0
+                                                           (current-seconds)) #f))])
 
     (when (hash-ref @options 'info #f)
       (for ([(key val) (in-hash (hash-ref @options 'info))])
@@ -100,7 +102,7 @@
 
       ;; create a page object
       (set! @page (make-object PDFPage this options))
-      (push-end @_pageBuffer @page)
+      (push-end! @_pageBuffer @page)
       ;; add the page to the object store
       (define pages (· @_root data Pages data))
       (hash-update! pages 'Kids (λ (val) (cons (· @page dictionary) val)) null)
@@ -131,9 +133,9 @@
     ;; so even a function defined without default values
     ;; can be called without arguments
     (public [@ref ref])
-    (define (@ref [data (make-hasheq)])
+    (define (@ref [data (mhash)])
       (define ref (make-object PDFReference this (add1 (length @_offsets)) data))
-      (push-end @_offsets #f) ; placeholder for this object's offset once it is finalized
+      (push-end! @_offsets #f) ; placeholder for this object's offset once it is finalized
       (++ @_waiting)
       ref)
 
@@ -184,7 +186,7 @@
       (· @_root end)
       (· @_root data Pages end)
 
-      (if (or (zero? @_waiting) 'debug)
+      (if (zero? @_waiting)
           (@_finalize)
           (set! @_ended #t))
 
@@ -227,7 +229,10 @@
   (require rackunit racket/file)
   (define ob (open-output-bytes))
   (send doc pipe ob)
-  #;(send doc pipe (open-output-file "demo.pdf" #:exists 'replace))
   (check-equal? (send doc end) 'done)
-  #;(display (get-output-bytes ob))
-  (check-equal? (get-output-bytes ob) (file->bytes "demo.pdf")))
\ No newline at end of file
+  (define result-str (get-output-bytes ob))
+  (define fn "out")
+  (with-output-to-file (string-append fn ".pdf")
+    (λ () (display result-str)) #:exists 'replace)
+  (check-equal? (file->bytes (string-append fn ".pdf")) (file->bytes (string-append fn " copy.pdf")))
+  #;(display (bytes->string/latin-1 result-str)))
\ No newline at end of file
diff --git a/pitfall/pitfall/kit/helper.rkt b/pitfall/pitfall/kit/helper.rkt
index 7ec75985..d2be36fb 100644
--- a/pitfall/pitfall/kit/helper.rkt
+++ b/pitfall/pitfall/kit/helper.rkt
@@ -56,9 +56,10 @@
 (define (newBuffer x) (string->bytes/latin-1 (format "~a" x)))
 (define buffer-length bytes-length)
 
-(define-syntax-rule (push-end id thing) (set! id (append id (list thing))))
+;; js-style `push`, which appends to end of list
+(define-syntax-rule (push-end! id thing) (set! id (append id (list thing))))
 
 (module+ test
   (define xs '(1 2 3))
-  (push-end xs 4)
+  (push-end! xs 4)
   (check-equal? xs '(1 2 3 4))) 
\ No newline at end of file
diff --git a/pitfall/pitfall/kit/demo.pdf b/pitfall/pitfall/kit/out copy.pdf
similarity index 88%
rename from pitfall/pitfall/kit/demo.pdf
rename to pitfall/pitfall/kit/out copy.pdf
index 2b72418f..f84357ef 100644
--- a/pitfall/pitfall/kit/demo.pdf
+++ b/pitfall/pitfall/kit/out copy.pdf	
@@ -25,9 +25,9 @@ endstream
 endobj
 6 0 obj
 <<
-/Producer (PitfallKit)
-/CreationDate 0
+/CreationDate (D:19700101000000Z)
 /Creator (PitfallKit)
+/Producer (PitfallKit)
 >>
 endobj
 2 0 obj
@@ -46,8 +46,8 @@ endobj
 xref
 0 7
 0000000000 65535 f 
-0000000385 00000 n 
-0000000336 00000 n 
+0000000403 00000 n 
+0000000354 00000 n 
 0000000186 00000 n 
 0000000119 00000 n 
 0000000015 00000 n 
@@ -59,5 +59,5 @@ trailer
 /Size 7
 >>
 startxref
-442
+460
 %%EOF
diff --git a/pitfall/pitfall/kit/out.pdf b/pitfall/pitfall/kit/out.pdf
new file mode 100644
index 00000000..f84357ef
--- /dev/null
+++ b/pitfall/pitfall/kit/out.pdf
@@ -0,0 +1,63 @@
+%PDF-1.3
+%ÿÿÿÿ
+5 0 obj
+<<
+/Parent 1 0 R
+/Resources 4 0 R
+/Contents 3 0 R
+/MediaBox [0 0 612 792]
+/Type /Page
+>>
+endobj
+4 0 obj
+<<
+/ProcSet [/PDF /Text /ImageB /ImageC /ImageI]
+>>
+endobj
+3 0 obj
+<<
+/Length 18
+>>
+stream
+1 0 0 -1 0 792 cm
+
+endstream
+endobj
+6 0 obj
+<<
+/CreationDate (D:19700101000000Z)
+/Creator (PitfallKit)
+/Producer (PitfallKit)
+>>
+endobj
+2 0 obj
+<<
+/Pages 1 0 R
+/Type /Catalog
+>>
+endobj
+1 0 obj
+<<
+/Kids [5 0 R]
+/Count 1
+/Type /Pages
+>>
+endobj
+xref
+0 7
+0000000000 65535 f 
+0000000403 00000 n 
+0000000354 00000 n 
+0000000186 00000 n 
+0000000119 00000 n 
+0000000015 00000 n 
+0000000254 00000 n 
+trailer
+<<
+/Info 6 0 R
+/Root 2 0 R
+/Size 7
+>>
+startxref
+460
+%%EOF
diff --git a/pitfall/pitfall/kit/params.rkt b/pitfall/pitfall/kit/params.rkt
new file mode 100644
index 00000000..1de9b8fe
--- /dev/null
+++ b/pitfall/pitfall/kit/params.rkt
@@ -0,0 +1,3 @@
+#lang racket/base
+(provide (all-defined-out))
+(define current-debug (make-parameter #t))
\ No newline at end of file
diff --git a/pitfall/pitfall/kit/mixins/vector.rkt b/pitfall/pitfall/kit/vector.rkt
similarity index 100%
rename from pitfall/pitfall/kit/mixins/vector.rkt
rename to pitfall/pitfall/kit/vector.rkt