diff --git a/TODO.FACTOR.txt b/TODO.FACTOR.txt
index 36873094d1..2ed3e37e09 100644
--- a/TODO.FACTOR.txt
+++ b/TODO.FACTOR.txt
@@ -1,11 +1,5 @@
 + 0.80:
 
-- flip-branches optimizer not working
-- prettyprint:
-
-  { V{ T{ literal T{ value f f G:110886 } f } T{ value 
-      f f G:110887
-  } } }
 - intrinsic char-slot set-char-slot for x86
 - closing ui does not stop timers
 - adding/removing timers automatically for animated gadgets
@@ -18,8 +12,6 @@
 - what about tasks and timers between image restarts
 
 - double hash
-- empty key change
-- if hash is full and we change existing key, it should not grow
 
 + ui:
 
diff --git a/library/collections/hashtables.factor b/library/collections/hashtables.factor
index f24e39e76b..d3e94b75f3 100644
--- a/library/collections/hashtables.factor
+++ b/library/collections/hashtables.factor
@@ -41,7 +41,7 @@ TUPLE: tombstone ;
     >r >r [ key@ ] 2keep pick -1 > r> r> if ; inline
 
 : <hash-array> ( n -- array )
-    1+ 4 * ((empty)) <repeated> >array ;
+    4 * ((empty)) <repeated> >array ;
 
 : reset-hash ( n hash -- )
     swap <hash-array> over set-underlying
@@ -154,15 +154,16 @@ IN: hashtables
 : hash-size ( hash -- n ) dup hash-count swap hash-deleted - ;
 
 : grow-hash ( hash -- )
-    [ underlying ] keep
-    [ >r length r> reset-hash ] 2keep
-    swap [ swap pick (set-hash) ] each-pair drop ;
+    [ dup underlying swap hash-size 1+ ] keep
+    [ reset-hash ] keep swap [ swap pick (set-hash) ] each-pair
+    drop ;
 
 : ?grow-hash ( hash -- )
-    dup hash-count 1+ 4 * over underlying length >
+    dup hash-count 2 + 2 * over underlying length >
     [ dup grow-hash ] when drop ;
 
-: set-hash ( value key hash -- ) dup ?grow-hash (set-hash) ;
+: set-hash ( value key hash -- )
+    [ (set-hash) ] keep ?grow-hash ;
 
 : hash-keys ( hash -- keys ) 0 swap hash>seq ;
 
diff --git a/library/inference/optimizer.factor b/library/inference/optimizer.factor
index e891bc6cf8..02951a427d 100644
--- a/library/inference/optimizer.factor
+++ b/library/inference/optimizer.factor
@@ -65,8 +65,8 @@ M: #shuffle optimize-node*  ( node -- node/t )
         compose-shuffle-nodes
     ] [
         drop [
-            dup node-in-d over node-out-d =
-            [ dup node-in-r swap node-out-r = ] [ drop f ] if
+            dup node-in-d over node-out-d sequence=
+            >r dup node-in-r swap node-out-r sequence= r> and
         ] prune-if
     ] if ;
 
diff --git a/library/syntax/prettyprint.factor b/library/syntax/prettyprint.factor
index d4827b61a5..194e9b39d7 100644
--- a/library/syntax/prettyprint.factor
+++ b/library/syntax/prettyprint.factor
@@ -298,7 +298,7 @@ M: tuple pprint* ( tuple -- )
     [
         \ T{ pprint*
         tuple>array dup first pprint*
-        <block 1 swap tail-slice pprint-elements block>
+        <block 1 swap tail-slice pprint-elements
         \ } pprint*
     ] check-recursion ;